Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 34
Filter
1.
An. R. Acad. Nac. Farm. (Internet) ; 89(2): 191-196, Abril - Junio 2023. tab, graf
Article in Spanish | IBECS | ID: ibc-223524

ABSTRACT

Introducción: La medición de los anticuerpos frente a tiroglobulina (ATG) y peroxidasa tiroidea (ATPO) es de interés para identificar pacientes con tiroiditis autoinmune.Este estudio pretende evaluar un inmunoensayo comercial de electroquimioluminiscencia para ATG y ATPO, estudiando la imprecisión, la linealidad, sensibilidad analítica, evaluación del arrastre, e influencia de interferentes endógenos.Material y métodos: La imprecisión se evaluó usando tres soluciones con diferentes concentraciones de analitos, analizándose 20 veces en la misma serie analítica y durante 20 días consecutivos, calculando el coeficiente de variación. Para el estudio de linealidad se combinaron una muestra con elevada concentración de analitos y un diluyente, obteniéndose concentraciones intermedias que se analizaron por triplicado. El límite de detección se calculó haciendo 20 determinaciones de una muestra de diluyente. El arrastre se evaluó analizando una muestra con alta concentración de anticuerpos seguida por otra con concentraciones muy bajas. El estudio de interferencias se realizó añadiendo a mezclas de suero hemolizado, Intralipid 30% y bilirrubina.Resultados: Las imprecisiones totales obtenidas (%) fueron 26,63, 9,53, y 14,9 para ATG y 21,19, 14,82 y 5,77 para ATPO. La linealidad queda definida por las ecuaciones de regresión: Y=6.61+1.01X(ATG) y Y=16.37+0.97X(ATPO). El límite de detección fue 17,17 para ATG y 5 para ATPO. El arrastre no fue significativo. La hemólisis produjo interferencia significativa en ambos ensayos.Conclusiones: Las imprecisiones obtenidas son comparables a las declaradas por el fabricante. La sensibilidad analítica cumple las especificaciones del fabricante. El comportamiento de ambos ensayos es lineal y no se halla arrastre significativo. La hemólisis interfiere ambos ensayos. (AU)


Introduction: The measuring of antibodies against thyroglobulin (ATG) and thyroperoxydase (ATPO) is useful for identifying patients with autoimmunethyroiditis. This study tries to assess an electrochemiluminescent immunoassay for ATG and ATPO, evaluating imprecision, linearity, analytic sensitivity, carry-over and the influence of endogenous interferents.Material and methods: Imprecision was assessed using three pools with different analytes concentrations, performing within run and between run 20 times. Fort the linearity study a sample containing high analyte concentration and a solvent devoid of analyte were combined, obtaining intermediates concentrations, which were analyzed by triplicate. The limit of detection was calculated analyzing 20 times a sample devoid of analyte. Carry-over was evaluated analyzing a sample with a high antibody concentration followed by other one containing low antibody concentration. The interference study was carried-out adding hemolyzed, Intralipid 30% and bilirubin into sera pool.Results: Total imprecision obtained (%) were 26.63, 9.53, and 14.9 for ATG and 21.19, 14.82, and 5.77 for ATPO. Linearity was defined for the following regression equations: Y=6.61+1.01X (ATG) and, Y=16.37+0.97X (ATPO). The limit of detection was 17.17 for ATG and 5 for ATPO. Carry-over was not significant. Hemolysis caused significant interference in both assays.Conclusions: Imprecision obtained were similar to the manufacturer declared ones. Analytic sensibility complies the manufacturer’s specifications. The behavior of both assays was linear and significant carry-over was not found. Hemolysis interferes in both assays. (AU)


Subject(s)
Humans , Immunoassay/instrumentation , Immunoassay/methods , Antibodies/analysis , Antithyroid Agents/analysis , Limit of Detection , Bilirubin/analysis , Hemolysis , Peroxidase/analysis , Thyroglobulin
2.
An. R. Acad. Nac. Farm. (Internet) ; 88(número extraordinario): 239-246, diciembre 2022. tab, graf
Article in Spanish | IBECS | ID: ibc-225718

ABSTRACT

Background: The aim of this study is to define the interference of biotin in several endocrine, tumor marker, and vitamin assays performed by an electrochemiluminescence method, trying to determinate the critical level that causes biotin interference.– Material and methods: Working biotin solutions were prepared in phosphate-buffered saline (PBS) at different concentrations (10000, 7500, 5000, 2500, 1250, 625, and 312.5 ng/mL), which were spiked on the samples to obtain final concentrations ten-fold lower. Each serum biotin dilution was tested in triplicate, using at least two levels of analytes. Determinations of several endocrine, vitamins, tumor and bone markers were carried-out with eletrochemilumenescent immunoassays on the cobas e801 and cobas e411. Comparison between the results obtained by analyzing the biotin-spiked samples and the reference PBS-spiked samples was performed using Microsoft Excel. The relative bias with the interfering-free specimen was calculated for each biotin concentration. Interference was considered significant when the relative bias exceeded 10%. Glick´s interferographs were performed plotting the percentage of change vs. biotin concentration.– Results: Analyte concentrations were spuriously decreased in 12 sandwich immunoassays and falsely increased in 11 competitive immunoassays. However thyrotropin and CA 15.3 antigen were not significantly affected.– Conclusions: Except CA 15.3 and TSH, the methods tested were susceptible to biotin interference. Falsely low values occurred in sandwich assays and high bias in competitive assays. Clinicians and laboratorians should be aware of the medical importance of biotin interference as a cause of misdiagnosis and incorrect treatment. (AU)


Objetivos: El propósito de este estudio es evaluar la interferencia de la biotina en varios inmunoensayos de hormonas, marcadores tumorales y vitaminas que usan el método de electroquimioluminiscencia, tratando de determinar el nivel crítico de biotina que causa la interferencia.-Material and metodos: Las soluciones de trabajo de biotina se prepararon en solución de tampon fosfato (PBS) en diferentes concentraciones (10000, 7500, 5000, 2500, 1250, 625, and 312.5 ng/mL), y fueron añadidas a las muestras para obtener la concentración final 10 veces inferior. Cada dilución de biotina se ensayó por triplicado, usando al menos dos niveles de analito. Las determinaciones de magnitudes bioquímicas endocrinas, marcadores tumorales, vitaminas y marcadores óseos fueron realizadas mediante inmunoensayo electroquimioluminiscente en los analizadores Cobas e801 y cobas e411. Se compararaon los resultados obtenidos al analizar las muestras con biotina y las de referencia con el mismo volumen de PBS, usando el programa Microsoft Excel. El error relativo fue calculado respecto a las muestras libres de biotina para acda concentración. La interferencia fue considerada significativa cuando el error excede el 10% Se construyeron interferogramas de Glick representando el porcentaje de cambio respecto a la concentración de biotina.-Resultados: Las concentraciones de analito fueron disminuidas en 12 inmunoensayos sándwich y falsamente incrementadas en 11 inmunoensayos competitivos. Por el contrario la tirotropina y el CA 15.3 no fueron significativamente afectados.-Conclusiones: Excepto la tirotropina y el antígeno CA 15.3 el resto de métodos testados fueron susceptibles de interferencia por biotina. Se obtuvieron valores falsamente disminuidos en los ensayos tipo sándwich y elevados en los ensayos competitivos. Tanto clínicos como analistas deben ser conscientes de la importancia médica de la interferencia por biotina como causa de diagnóstico erróneo y tratamiento incorrecto. (AU)


Subject(s)
Humans , Biotin , Biomarkers, Tumor , Vitamins , Thyrotropin
3.
Clin Biochem ; 105-106: 44-48, 2022.
Article in English | MEDLINE | ID: mdl-35421358

ABSTRACT

BACKGROUND: Plasma osmolality is a physic and chemical property of interest in emergency medicine. This magnitude can be measured at the laboratory, but it is usually estimated with equations. A huge variety of formulas for calculating osmolality have been published, most of them relying on sodium, urea and glucose. The purpose of this study is to develop a new equation for plasma osmolality calculation. In addition we assess the new equation in a sample of healthy individuals. METHODS: We used results of sodium, potassium, glucose, urea and osmolality recovered from our patient's database. Multivariate lineal regression was carried-out, considering sodium and potassium as separated variables and as unique variable. In a second phase the obtained equations were tested in a sample of healthy blood-donors. Osmolality was measured by freezing point depression. RESULTS: In the first phase, 1362 plasma determinations for sodium, potassium, glucose, urea and osmolality were analyzed. All of included variables had a significant correlation with measured osmolality, being the highest correlation with sodium plus potassium and the lowest one was with potassium alone. The formulas obtained for the osmolality estimation were 1.86*Na + 1.6*(Glucose/18) + 1.12*(Urea/6) + 21 (A) and 1.88*(Na + K) + 1.59*(Glucose/18) + 1.08*(Urea/6) + 10.6 (B). Assess of the new equations in a sample of healthy individuals showed better results than equations previously published. The lowest difference versus measured osmolality was produced by formula B. CONCLUSION: The equations produced in this study perform better in the estimation of plasma osmolality than previously published formulas. We recommend introducing formula B in the clinical chemistry routine.


Subject(s)
Blood Glucose , Sodium , Humans , Osmolar Concentration , Potassium , Urea
4.
Sleep Med Res ; 12(1): 64-73, 2021 Jun.
Article in English | MEDLINE | ID: mdl-34790431

ABSTRACT

OBJECTIVE AND OBJECTIVE: Obstructive Sleep Apnea (OSA) is a highly prevalent disorder that disparately affects racial/ethnic minorities. OSA functional health literacy can contribute to health disparities. Documenting poor OSA functional health literacy is needed to inform research agendas, policy, and advocacy efforts. The objective of this study is to develop a scale for measuring OSA functional health literacy among diverse audiences and a variety of reading levels and to ascertain its reliability and validity. METHODS: Development of the 18-item Survey of OSA Functional Health Literacy (SOFHL) was guided by literature review and input from experts. A convenience sample of persons enrolled in a clinical trial completed the survey (n=194). The psychometric evaluation was conducted using factor analysis to identify the number of dimensions in the SOFHL and their relationship to other domains that are relevant to OSA functional health literacy. RESULTS: Internal consistency reliability (alpha) was estimated for the resulting scale and correlations with educational attainment and income completed. All respondents were Black and 29% reported average household income less than $10,000 USD. Confirmatory factor analysis provided support for two dimensions: OSA general knowledge (alpha=0.81) and self-efficacy for OSA self-management (alpha=0.71). CONCLUSIONS: Higher educational attainment and socioeconomic status were associated with better OSA functional health literacy. These results provide preliminary support for the SOFHL, a measure that can be used to assess OSA functional health literacy.

5.
An. R. Acad. Nac. Farm. (Internet) ; 87(3): 329-246, julio- septiembre 2021. tab, graf
Article in Spanish | IBECS | ID: ibc-207498

ABSTRACT

Background: The aim of this study is to define the interference of biotin in several endocrine, tumor marker, and vitamin assays performed by an electrochemiluminescence method, trying to determinate the critical level that causes biotin interference. Material and methods: Working biotin solutions were prepared in phosphate-buffered saline (PBS) at different concentrations (10000, 7500, 5000, 2500, 1250, 625, and 312.5 ng/mL), which were spiked on the samples to obtain final concentrations ten-fold lower. Each serum biotin dilution was tested in triplicate, using at least two levels of analytes. Determinations of several endocrine, vitamins, tumor and bone markers were carried-out with eletrochemilumenescent immunoassays on the cobas e801 and cobas e411. Comparison between the results obtained by analyzing the biotin-spiked samples and the reference PBS-spiked samples was performed using Microsoft Excel. The relative bias with the interfering-free specimen was calculated for each biotin concentration. Interference was considered significant when the relative bias exceeded 10%. Glick´s interferographs were performed plotting the percentage of change vs. biotin concentration. Results: Analyte concentrations were spuriously decreased in 12 sandwich immunoassays and falsely increased in 11 competitive immunoassays. However thyrotropin and CA 15.3 antigen were not significantly affected. Conclusions: Except CA 15.3 and TSH, the methods tested were susceptible to biotin interference. Falsely low values occurred in sandwich assays and high bias in competitive assays. Clinicians and laboratorians should be aware of the medical importance of biotin interference as a cause of misdiagnosis and incorrect treatment.(AU)


Objetivos: El propósito de este estudio es evaluar la interferencia de la biotina en varios inmunoensayos de hormonas, marcadores tumorales y vitaminas que usan el método de electroquimioluminiscencia, tratando de determinar el nivel crítico de biotina que causa la interferencia. Material and metodos: Las soluciones de trabajo de biotina se prepararon en solución de tampon fosfato (PBS) en diferentes concentraciones (10000, 7500, 5000, 2500, 1250, 625, and 312.5 ng/mL), y fueron añadidas a las muestras para obtener la concentración final 10 veces inferior. Cada dilución de biotina se ensayó por triplicado, usando al menos dos niveles de analito. Las determinaciones de magnitudes bioquímicas endocrinas, marcadores tumorales, vitaminas y marcadores óseos fueron realizadas mediante inmunoensayo electroquimioluminiscente en los analizadores Cobas e801 y cobas e411. Se compararaon los resultados obtenidos al analizar las muestras con biotina y las de referencia con el mismo volumen de PBS, usando el programa Microsoft Excel. El error relativo fue calculado respecto a las muestras libres de biotina para acda concentración. La interferencia fue considerada significativa cuando el error excede el 10% Se construyeron interferogramas de Glick representando el porcentaje de cambio respecto a la concentración de biotina. Resultados: Las concentraciones de analito fueron disminuidas en 12 inmunoensayos sándwich y falsamente incrementadas en 11 inmunoensayos competitivos. Por el contrario la tirotropina y el CA 15.3 no fueron significativamente afectados. Conclusiones: Excepto la tirotropina y el antígeno CA 15.3 el resto de métodos testados fueron susceptibles de interferencia por biotina. Se obtuvieron valores falsamente disminuidos en los ensayos tipo sándwich y elevados en los ensayos competitivos. Tanto clínicos como analistas deben ser conscientes de la importancia médica de la interferencia por biotina como causa de diagnóstico erróneo y tratamiento incorrecto.(AU)


Subject(s)
Humans , Biotin , Immunoassay , Luminescence , Electrochemotherapy
6.
Gac Med Mex ; 154(6): 689-692, 2018.
Article in Spanish | MEDLINE | ID: mdl-30532107

ABSTRACT

Azithromycin and doxycycline effectiveness has been demonstrated in the treatment of urogenital chlamydiasis, which has remained unchanged for a long time. Autoinoculation has been proposed as a method of reinfection and persistence of the disease in women and probably also owing to azithromycin pharmacokinetics in this tissue. With the new diagnostic methods and tests of cure, a difference has been demonstrated in favor of doxycycline in the treatment of rectal chlamydiasis Antimicrobial resistance has not played a relevant role since no treatment-resistant strains have been found in vivo. Nevertheless, azithromycin remains a first-choice drug, since it can be administered as a single dose, which favors therapeutic adherence.


Se ha demostrado la efectividad de la azitromicina y la doxiciclina en el tratamiento de la clamidiasis urogenital, lo que se ha mantenido sin cambios por mucho tiempo. Se ha propuesto la autoinoculación como método de reinfección y persistencia de la enfermedad en las mujeres y también debido a la farmacocinética de la azitromicina en este tejido. Con los nuevos métodos diagnósticos y las pruebas de curación se ha comprobado una diferencia a favor de la doxiciclina en el tratamiento de la clamidiasis rectal. La resistencia antimicrobiana no ha desempeñado un papel relevante porque no se han encontrado cepas resistentes in vivo al tratamiento. A pesar de ello, la azitromicina sigue siendo un fármaco de primera elección ya que puede administrarse como una dosis única, lo que favorece el apego terapéutico.


Subject(s)
Anti-Bacterial Agents/administration & dosage , Azithromycin/administration & dosage , Chlamydia Infections/drug therapy , Anti-Bacterial Agents/pharmacokinetics , Azithromycin/pharmacokinetics , Chlamydia Infections/diagnosis , Chlamydia Infections/microbiology , Chlamydia trachomatis/isolation & purification , Drug Administration Schedule , Drug Resistance, Bacterial , Female , Humans , Medication Adherence
7.
Rev. lab. clín ; 11(3): 118-122, jul.-sept. 2018.
Article in English | IBECS | ID: ibc-176905

ABSTRACT

Background: Despite being the most widely used medical decision-making tool, reference intervals are not usually determined by clinical laboratories, due to the highly demanding activities and costly process it involves. However, scientific societies encourage individual clinical laboratories to establish their own reference values. This is especially important in the cases of folate and vitamin B12, due to strong differences in vitamin status among different populations. Objective: Our aim is to establish reference intervals for folate and vitamin B12 levels in a healthy blood donor population using an electrochemiluminiscent method (ROCHE DIAGNOSTICS). Method: Folate and vitamin B12 levels were measured in 141 healthy blood donors aged between 18 and 65 years. Biochemical analyses were performed using a Modular E170 analyzer (ROCHE DIAGNOSTICS) and an electrochemiluminiscent method. Reference intervals were calculated with a non-parametric percentile method following the CLSI guidelines. Results: There were not significant differences in folate or cobalamin levels between age or sex subgroups. The limits of the reference interval for folate were 2.2 and 18ng/mL (5-40.7nmol/L), and 213.8 and 763.3pg/mL (158.2-564.8pmol/L) for vitamin B12. These intervals differed from those claimed by the manufacturer. Conclusions: Our results emphasize the convenience of building reference values based on the population served by the laboratory, in order to unequivocally rule out deficiencies of folate or vitamin B12


Introducción: A pesar de ser una de las herramientas más usadas en la toma de decisiones médicas, los intervalos de referencia son raramente determinados en los laboratorios, debido a que es una labor compleja en términos de tiempo, esfuerzo y coste. Sin embargo las sociedades científicas recomiendan que los laboratorios establezcan sus propios valores de referencia. Esto es especialmente importante para el folato y la vitamina B12, debido a las grandes diferencias entre poblaciones. Objetivo: Nuestro propósito es establecer los valores de referencia en una población de donantes sanos, mediante un método electroquimioluminiscente (Roche Diagnostics). Método: Los niveles de folato y vitamina B12 se midieron en una muestra integrada por 141 donantes sanos de una edad comprendida entre 18 y 65 años. Los análisis bioquímicos se realizaron en un analizador Modular E170 (Roche Diagnostics). Los intervalos de referencia se calcularon siguiendo el método no paramétrico propuesto por las guías del CLSI. Resultados: No hubo diferencias en los niveles de folato ni vitamina B12 entre sexos ni grupos de edad. Los límites de referencia para el folato fueron 2,2 y 18ng/ml (5-40,7nmol/l), y 213,8 y 763,3pg/ml (158,2-564,8 pmol/l) para la vitamina B12. Estos intervalos difirieron de los propuestos por el fabricante. Conclusiones: Nuestros resultados subrayan la importancia de obtener valores de referencia en la población a la que da servicio el laboratorio para excluir inequívocamente las deficiencias de folato y vitamina B12


Subject(s)
Humans , Male , Female , Adolescent , Young Adult , Adult , Middle Aged , Vitamin B 12/blood , Folic Acid/blood , Blood Banks/standards , Luminescent Measurements/methods , Electrochemical Techniques/methods , Reference Values , Blood Donors , Healthy Volunteers/statistics & numerical data
8.
Rev. Hosp. Ital. B. Aires (2004) ; 38(1): 11-18, mar. 2018. graf., tab.
Article in Spanish | LILACS | ID: biblio-1023462

ABSTRACT

Introducción: las intoxicaciones agudas son motivo de consulta cada vez más frecuente en los Servicios de Urgencia hospitalarios (SUH) debido a la mayor disponibilidad y acceso a productos químicos tóxicos. Se observan diferentes patrones en cada área sanitaria según el tipo de población, geografía y perfil epidemiológico de consumo. Material y métodos: el objetivo de nuestro estudio es realizar un perfil epidemiológico y describir el manejo del paciente que acude por clínica compatible con intoxicación aguda por drogas de abuso (IA) basado en la determinación de tóxicos en orina para seis sustancias (cannabis, opiáceos, cocaína, anfetaminas, benzodiazepinas y éxtasis) solicitados en el período de estudio 2010-2012. Resultados: se solicitaron 2755 peticiones, de las cuales fueron positivas 1429, y se estudiaron al azar 661 historias clínicas. El perfil de paciente intoxicado de nuestra área es el de varón de entre 30 y 40 años, consumidor preferentemente de cannabis y cocaína; las benzodiazepinas son el tóxico más frecuente en las mujeres, con clínica mayoritariamente neurológica, sin diferencias en cuanto a la franja horaria o el mes del año en que recibió el alta desde el propio SUH en casi el 60% de los casos. Discusión: las IA en los SUH representan casi el 1% de las consultas y tienen una escasa mortalidad. En algunos casos, el médico de urgencias comienza el tratamiento antes de conocer el resultado toxicológico, lo que nos hace plantearnos la utilidad real y el coste-efectividad de estas determinaciones en todos los pacientes con alteración del nivel de conciencia. (AU)


Introduction: acute intoxications are a rising and common query demand on the emergency rooms because of the easy access and disponibility to toxic substances, where we can observe different patterns attending to type of population, geography and epidemiologic consume profile. Material and methods: our objective is to analyze the epidemiology and patient handling coming to the Emergency Room (ER) with compatible symptoms of street drugs abuse, based on the determination of cannabis, cocaine, amphetamine, benzodiazepine, opiates and ectasy urine levels in the period 2010-2012. Results: the ER requested 2755 determinations being positive 1429 and randomly examined 661 clinical histories. The profile of intoxicated patient was male, 30 to 40 years old, preferently cannabis and cocaine consumer (benzodiazepine in women), mostly with neurological symptoms when arrive, without differences between months or day time and, almost 60% of them, discharged directly from the ER. Conclusions: acute intoxications barely represent 1% of ER demands and produce poor or scarce mortality. Sometimes, doctors in charge start with therapeutic measures before knowing the results of toxicology, what leads us to ask about actual usefulness and cost-efficiency of the toxicology assay to every patient with low conscious level. (AU)


Subject(s)
Humans , Male , Female , Adult , Poisoning/epidemiology , Illicit Drugs/poisoning , Chemical Compounds/adverse effects , Ambulatory Care/statistics & numerical data , Poisoning/therapy , Spain/epidemiology , Dronabinol/poisoning , Benzodiazepines/poisoning , Cannabis/poisoning , Illicit Drugs/analysis , Illicit Drugs/toxicity , Age Factors , Cocaine/poisoning , N-Methyl-3,4-methylenedioxyamphetamine/poisoning , Consciousness Disorders/chemically induced , Emergency Service, Hospital/statistics & numerical data , Opiate Alkaloids/poisoning , Epidemiological Monitoring , Amphetamines/poisoning
9.
Qual Life Res ; 27(1): 235-247, 2018 01.
Article in English | MEDLINE | ID: mdl-28875367

ABSTRACT

PURPOSE: To assess the equivalence of self-reports of physical functioning between pediatric respondents to the English- and Spanish-language patient-reported outcomes measurement information system (PROMIS®) physical functioning item banks. METHODS: The PROMIS pediatric physical functioning item banks include 29 upper extremity items and 23 mobility items. A sample of 5091 children and adolescents (mean age = 12 years, range 8-17; 49% male) completed the English-language version of the items. A sample of 605 children and adolescents (mean age = 12 years, range 8-17; 55% male; 96% Hispanic) completed the Spanish-language version of the items. RESULTS: We found language (English versus Spanish) differential item functioning (DIF) for 4 upper extremity items and 7 mobility items. Product-moment correlations between estimated upper extremity and mobility scores using the English versus the equated Spanish item parameters for Spanish-language respondents were 0.98 and 0.99, respectively. After excluding cases with significant person misfit, we found DIF for the same 4 upper extremity items that had DIF in the full sample and for 12 mobility items (including the same 7 mobility items that had DIF in the full sample). The identification of DIF items between English- and Spanish-language respondents was affected slightly by excluding respondents displaying person misfit. CONCLUSIONS: The results of this study provide support for measurement equivalence of self-reports of physical functioning by children and adolescents who completed the English- and Spanish-language surveys. Future analyses are needed to replicate the results of this study in other samples.


Subject(s)
Language , Psychometrics/methods , Quality of Life/psychology , Adolescent , Child , Female , Hispanic or Latino , Humans , Male , Surveys and Questionnaires
10.
Nefrologia ; 37(2): 172-180, 2017.
Article in English, Spanish | MEDLINE | ID: mdl-28434703

ABSTRACT

BACKGROUND: The evidence of glomerular filtration rate (GFR) estimating with serum creatinine based formulae in the elderly population is scarce. The purpose of this study is to compare CKD-EPI, MRD4-IDMS and BIS1 equations to analyse correlation and concordance in a population older than 85 years old. PATIENTS AND METHODS: We designed a retrospective cross-sectional study, which included data from 600 patients older than 85 years. GFR was estimated by the following equations: CKD-EPI, MDR4-IDMS and BIS1, using as variables sex, age and serum creatinine concentration. Statistics analysis included Wilcoxon test, Bland-Altman plot, non-parametric Passing-Bablok method and kappa statistic (simple and weighted). RESULTS: The patients' median (range) age was 87 (interval 85-98). The median GFR (range) was 42.4 (5.2-127.4) mL/min/1.73 m2, when it was estimated with MDRD-IDMS, 40.0 (4.5-93.1) for CKD-EPI and 36.9 (7.6-83.7) for BIS1. The comparison of BIS1 and CKD-EPI and MDRD-IDMS using the Wilcoxon test was significant (P<.001). The regression analysis yielded the following equations: MDRD-IDMS= 1,025×CKD-EPI+1.360; BIS1= 0.688×CKD-EPI+9.074 and BIS1= 0.666×MDRD-IDMS+8.401. The weighted coefficient was 0.958 for the concordance between MDRD-IDMS and CKD-EPI, 0.812 for the concordance between MDRD-IDMS and BIS1 and 0.846 for CKD-EPI and BIS1. CONCLUSIONS: The GFR estimations obtained with BS1 equation are not interchangeable with MDRD-IDMS or CKD-EPI equations. BIS1 estimates lower GFR values than MDRD-IDMS and CKD-EPI and tends to classify the patients in a more advanced chronic kidney disease stage, especially for estimated GFR higher than 29mL/min/1.73 m2.


Subject(s)
Glomerular Filtration Rate , Renal Insufficiency, Chronic/diagnosis , Renal Insufficiency, Chronic/physiopathology , Aged, 80 and over , Cross-Sectional Studies , Female , Humans , Male , Mathematical Concepts
11.
Nefrología (Madr.) ; 37(2): 172-180, mar.-abr. 2017. tab, graf
Article in Spanish | IBECS | ID: ibc-162171

ABSTRACT

Antecedentes: La estimación del filtrado glomerular (FG) en el anciano con las fórmulas basadas en la creatinina es limitada. El objetivo del estudio es comparar las ecuaciones CKD-EPI, MDRD-IDMS y BIS1 y analizar la correlación y la concordancia en una población mayor de 85 años. Pacientes y métodos: Realizamos un estudio transversal retrospectivo y se recogieron datos de 600 pacientes mayores de 85 años. Se estimó el FG por las ecuaciones CKD-EPI, MDRD-IDMS y BIS1 a partir de datos de sexo, edad y creatinina. El estudio estadístico incluyó el test de Wilcoxon, análisis de Bland-Altman, rectas de regresión de Passing-Bablok, concordancia bruta e índice ponderado. Resultados: La mediana (intervalo) de edad de los pacientes fue 87 (85-98). Las medianas del filtrado glomerular estimado por MDRD-IDMS fueron 42,4 (5,2-127,4) mL/min/1,73 m2, según CKD-EPI 40,0 (4,5-93,1) mL/min/1,73 m2 y por BIS1 36,9 (7,6-83,7) mL/min/1,73 m2. La comparación mediante test de Wilcoxon de BIS1 con CKD-EPI y MDRD-IDMS fue significativa (p<0,001). El análisis de regresión dio lugar a las siguientes ecuaciones: MDRD-IDMS = 1,025×CKD-EPI+1,36; BIS1=0,688×CKD-EPI+9,074 y BIS1=0,666×MDRD-IDMS+8,401. La concordancia ponderada entre MDRD-IDMS y CKD-EPI fue κ=0,598; entre MDRD-IDMS y BIS1: κ=0,812 y entre CKD-EPI y BIS1: κ=0,846. Conclusiones: Las estimaciones de FG obtenidas con la ecuación BIS1 no son intercambiables ni con MDRD-IDMS ni con CKD-EPI. La ecuación BIS1 presenta valores más bajos que MDRD-IDMS y CKD-EPI, y tiende a clasificar en un estadio mayor de ERC a los pacientes, sobre todo a partir de un FG estimado de 29mL/min/1,73 m2 (AU)


Background: The evidence of glomerular filtration rate (GFR) estimating with serum creatinine based formulae in the elderly population is scarce. The purpose of this study is to compare CKD-EPI, MRD4-IDMS and BIS1 equations to analyse correlation and concordance in a population older than 85 years old. Patients and methods: We designed a retrospective cross-sectional study, which included data from 600 patients older than 85 years. GFR was estimated by the following equations: CKD-EPI, MDR4-IDMS and BIS1, using as variables sex, age and serum creatinine concentration. Statistics analysis included Wilcoxon test, Bland-Altman plot, non-parametric Passing-Bablok method and kappa statistic (simple and weighted). Results: The patients’ median (range) age was 87 (interval 85-98). The median GFR (range) was 42.4 (5.2-127.4) mL/min/1.73 m2, when it was estimated with MDRD-IDMS, 40.0 (4.5-93.1) for CKD-EPI and 36.9 (7.6-83.7) for BIS1. The comparison of BIS1 and CKD-EPI and MDRD-IDMS using the Wilcoxon test was significant (P<.001). The regression analysis yielded the following equations: MDRD-IDMS= 1,025×CKD-EPI+1.360; BIS1= 0.688×CKD-EPI+9.074 and BIS1= 0.666×MDRD-IDMS+8.401. The weighted coefficient was 0.958 for the concordance between MDRD-IDMS and CKD-EPI, 0.812 for the concordance between MDRD-IDMS and BIS1 and 0.846 for CKD-EPI and BIS1. Conclusions: The GFR estimations obtained with BS1 equation are not interchangeable with MDRD-IDMS or CKD-EPI equations. BIS1 estimates lower GFR values than MDRD-IDMS and CKD-EPI and tends to classify the patients in a more advanced chronic kidney disease stage, especially for estimated GFR higher than 29mL/min/1.73 m2 (AU)


Subject(s)
Humans , Male , Female , Aged, 80 and over , Glomerular Filtration Rate/physiology , Renal Insufficiency, Chronic/physiopathology , Creatinine/analysis , Kidney Function Tests/methods , Renal Insufficiency, Chronic/epidemiology , Retrospective Studies
12.
Rev. lab. clín ; 9(3): 108-114, jul.-sept. 2016. tab
Article in Spanish | IBECS | ID: ibc-154958

ABSTRACT

Introducción. La proteína epididimaria humana (HE4) es un nuevo marcador para el diagnóstico del cáncer de ovario. Junto con el CA125 mejora el rendimiento diagnóstico a través del algoritmo de riesgo de malignidad (ROMA) especialmente en mujeres posmenopáusicas. Nuestro objetivo es verificar las prestaciones analíticas del ensayo de electroquimioluminscencia del HE4 en el analizador Cobas e411. Material y métodos. Para el estudio de la imprecisión y la veracidad se analizaron dos niveles de controles comerciales durante 20 días. El límite de blanco y límite de detección se evaluaron haciendo 20 repeticiones de un espécimen sin analito. La linealidad se evalúo mediante un análisis de regresión lineal mezclando un espécimen con elevada concentración de HE4 y otro desprovisto de analito. Además se evaluaron el arrastre y la influencia de interferencias endógenas. Resultados. Las imprecisiones obtenidas para cada nivel fueron 1,7 y 2,8% para la intraserial, 2,59 y 1,28% para la interserial y 4,67 y 4,47% para la total. Los errores relativos fueron 6,11 y 1,54% para cada nivel. El límite de blanco fue de 1,25 pmol/L y límite de detección 2,21 pmol/L. El estudio de linealidad produjo la siguiente ecuación de regresión y=-18,22+0,98 x demostrando un comportamiento lineal. No hubo arrastre significativo. El método no resultó afectado por la hemólisis, ictericia ni lipidemia. Conclusiones. El método de electroquimioluminiscencia para HE4 mostró una imprecisión y veracidad excelentes. El límite de detección resultó ser más bajo que el declarado por el fabricante. El comportamiento del método fue lineal dentro del intervalo estudiado. Además el ensayo no mostró arrastre ni interferencias endógenas significativas (AU)


Introduction. Human epididymis protein 4 (HE4) is an emerging tumor marker in diagnosis of ovarian cancer. Together with the cancer antigen CA 125 it can improve sensitivity and specificity by calculating the risk of ovarian malignancy algorithm (ROMA) score. Our purpose is to validate performance characteristics of the electrochemiluminiscent Cobas e411 assay for HE4, including the endogenous interference study. Material and methods. Two different levels of commercial control were analyzed for imprecision and trueness study during 20 days. Limit of blank and limit of detection was assessed with 20 replicates of a sample lacking HE4. Linearity was assessed by regression analysis mixing specimens, with high HE4 concentration and a devoid analyte one. In addition carry-over assay and endogenous interference study were conducted. Results. The imprecision obtained for each level were 1.7 and 2.8% for within run, 2.59 and 1.28%, for between run and 4.67 and 4.47% for total imprecision. The relative biases were 6.11 and 1.54% for each level. The limit of blank was 1.25 pmol/L and the limit of detection 2.21 pmol/L. The linearity study yielded the following regression equation y=-18.22+0.98x, demonstrating a linear behavior. There was not significant carry-over. The method was not affected by hemolysis, bilirrubin, neither lipemia. Conclusions. Electrochemiluminiscence method for HE4 showed an excellent imprecision and trueness. The limit of detection resulted lower than the declared by the manufacturer. Linearity was verified within the limits studied. In addition the assay is devoid of carry-over and free of significant endogenous interferences (AU)


Subject(s)
Humans , Male , Female , Luminescent Measurements/methods , Luminescent Measurements/standards , Biomarkers, Tumor/analysis , Proteins/metabolism , Autoantibodies/analysis , CA-125 Antigen/analysis , Diagnostic Techniques and Procedures/standards , Diagnostic Techniques and Procedures , Regression Analysis , Linear Models
13.
Rev. chil. cardiol ; 35(2): 127-132, 2016. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-796798

ABSTRACT

Introducción: El ácido acetilsalicílico (AAS) es ampliamente utilizado en el manejo de patología cardiovascular. En modelos "in vitro" el AAS restringe la angiogénesis, atribuyéndose este efecto al bloqueo de ciclooxigenasa-1, manteniendo íntegra la zona adhe-rente endotelial, citotoxicidad directa y otras vías de señalización. Hipótesis: El AAS en concentración terapéutica antiplaquetaria utilizada en humanos ejerce un efecto antiangiogénico en modelo de membrana alantocorió-nica de pollo (MAC). Objetivo: Comparar la capacidad antiangiogénica del AAS en distintas concentraciones en MAC utilizando como punto de comparación la angiogénesis fisiológica de la MAC. Método: Se incubaron 46 huevos fecundados de gallinas White Leghorn, en cámara temperada a 37°C, provenientes del Instituto de Salud Pública de Chile. Mediante procedimiento descrito por Ribatti (2006), se instiló sobre filtro de metilcelulosa 10uL de Dimetilsulfóxido al 0.1% + m199, sin fármaco al control, asociado a AAS y ácido salicílico (AS) a los grupos de estudio en concentraciones 2mM y 5 mM. Posteriormente se fijó y analizó la muestra en forma ciega. Resultados: El promedio de vasos del control fue 21.8. Para el grupo AAS 2mM y 5mM fue 11.3 y 10, siendo para el grupo AS 2mM y 5mM 15.6 y 12.4. El análisis estadístico mediante ANOVA y t-Student muestra que todos los grupos que recibieron fármacos tuvieron una disminución significativa en el numero de vasos sanguíneos en relación al grupo control. No hubo diferencias significativas entre ambo grupos de AAS. El AS demostró tener mayor potencia antiangiogénica dosis dependiente. Discusión: En este estudio se demuestra que el AAS ejerce un efecto antiangiogénico en concentración terapéutica en condiciones fisiológicas de un modelo "in vivo".


Background: Acetylsalicylic acid (ASA) is widely used in the treatment of various cardiovascular disorders. In vitro, AAS decreases angiogenesis, through cyclo-oxigenase-1 blockade while keeping active the adherent endothelial zone, direct toxicity and other signaling pathways. Hypothesis: AAS at therapeutic anti plaquetary doses exerts an anti-angiogenic effect in the alanto choronic chicken membrane (ACM) Method: 46 fertilized eggs form White Leghorn hens were incubated at 37oC. 10 uL of 0.1% Dimethyl sulfoxide +Ml 19 with no drug were used as control, while experimental groups received ASA and Salicylic acid (SA), 2mM. After fixation, samples were analyzed in a blind fashion Results: The mean number of vessels was 21.8 for controls, 11.3 and 10 for ASA 2mM and ASA 5mM, respectively. Corresponding values for SA 2 and SA 5mM were 15.6 and 12.4, respectively. Thus, a statistically significant (ANOVA and Student's t) decrease in the number of vessels was observed in both ASA groups. SA showed had a greater potential for anti-angiogenesis in a dose dependent way. Conclusion: This study shows that ASA in therapeutic concentrations has an anti-angiogenic effect in a physiologic model in vivo.


Subject(s)
Animals , Chick Embryo , Aspirin/pharmacology , Neovascularization, Physiologic/drug effects , Angiogenesis Inhibitors/pharmacology , Chorioallantoic Membrane , Chickens
14.
Rev. lab. clín ; 8(1): 39-45, ene.-mar. 2015. ilus, tab
Article in Spanish | IBECS | ID: ibc-135472

ABSTRACT

Introducción: El péptido natriurético cerebral y su fragmento aminoterminal (NT-proBNP) se secretan en respuesta al incremento de la presión arterial y sobrecarga de volumen. Presenta un elevado valor predictivo negativo para el diagnostico de la insuficiencia cardiaca, correlacionándose con su grado de severidad. La procalcitonina es un biomarcador que aumenta su concentración en el plasma de pacientes sépticos, y permite diferenciar infecciones bacterianas frente a otras etiologías, siendo su concentración proporcional a la gravedad de la sepsis. Ambos biomarcadores presentan un elevado precio, que no hace aconsejable su uso indiscriminado. En el presente trabajo hemos propuesto un protocolo de petición para los 2 biomarcadores, basado en los criterios clínicos, con el fin de filtrar adecuadamente las peticiones a través del sistema informático del laboratorio (SIL). Método: Se diseñaron volantes de petición basados en la guía de la insuficiencia cardiaca de la European Society of Cardiology, para el NT-proBNP y en la guía de la Society of Critical Care Medicine para procalcitonina, puntuándose cada uno de los ítems considerados. Mediante reglas informáticas se excluyeron las peticiones cuya puntuación fuese inferior a un determinado valor. Para ambos biomarcadores se excluyeron aquellas peticiones que no procedían de los servicios clínicos implicados. Resultados: Se solicitaron un total de 140 peticiones para el NT-proBNP y 339 para la procalcitonina. Para la procalcitonina se excluyeron 32 peticiones (4,42%) y para el NT-proBNP 4 peticiones (9,43%). Conclusiones: El diseño de una petición específica para NT-proBNP y procalcitonina es una herramienta eficaz para controlar el gasto (AU)


Background: Type B natriuretic peptide and its N-terminal fragment (NT-proBNP) are secreted in response to an increase in blood pressure and volume overload. NT-proBNP shows a high negative predictive value for heart failure and correlates with the level of severity. Procalcitonin is a biomarker over-expressed in septic patients, which enables bacterial infections to be distinguished from other etiologies, as its concentration is proportional to sepsis severity. Both biomarkers are expensive, thus its indiscriminate use is not advisable. A request protocol based on clinical criteria is presented for both biomarkers, in order to filter the requests using the laboratory informatics system (LIS). Methods: The request forms were designed following the heart failure guidelines of European Society of Cardiology for NT-proBNP, and the guidelines of Society of Critical Care Medicine for procalcitonin, giving a score for each item. Using computerized rules, requests with a score lower than a specific cut-off value were excluded. In addition requests from clinical departments not involved in critical patient care were rejected. Results: A total of 140 requests were received for NT-proBNP, with 339 for procalcitonin. Of these 32 (9.43%) were rejected for procalcitonin, and 4 (2.8%) for NT-proBNP. It can be concluded that the design of a specific request form for NT-proBNP and procalcitonin is an efficient tool for the cost management (AU)


Subject(s)
Humans , Male , Female , Materials Management, Hospital/classification , Materials Management, Hospital/economics , Materials Management, Hospital/ethics , Cost Control/economics , Cost Control/ethics , Heart Failure/diagnosis , Materials Management, Hospital , Materials Management, Hospital/methods , Laboratory Equipment , Cost Control/methods , Cost Control/organization & administration , Heart Failure/complications
15.
An. Fac. Med. (Perú) ; 76(1): 63-70, ene.-mar. 2015.
Article in Spanish | LILACS, LIPECS | ID: lil-780439

ABSTRACT

Antecedentes: Este artículo emerge como parte de un proceso liderado por la Academia Nacional de Medicina del Perú en estrecha colaboración con otras Academias de Medicina Latinoamericanas, e importantes instituciones universitarias y profesionales relacionadas con la salud. Objetivo: Describir y fundamentar la importancia de la Medicina Centrada en la Persona (MCP) en el contexto latinoamericano. Metodología: Revisión de artículos y experiencias latinoamericanas sobre el tema, realización de reuniones académicas para deliberar sobre contenidos afines, dos preliminares en Lima en diciembre 2013 y enero 2014, una tercera en Buenos Aires, a propósito del 2° Congreso Internacional de Medicina Centrada en la Persona, con la presencia de las Academias de Medicina de Argentina, Bolivia, Chile y Perú (noviembre 2014) y una cuarta en Lima, Reunión de las Academias de Medicina de Bolivia, Colombia, Chile, Paraguay y Perú (diciembre 2014). Resultados: Se puntualizan los precedentes históricos y contemporáneos, universales y locales, pertinentes a la gestación y desarrollo de una re-priorización de la medicina en torno a la persona y su contexto, articulando para el efecto ciencia y humanismo. Se discute el nivel filosófico del concepto Persona en medicina, incluyendo bases terminológicas, históricas, y derechos humanos. Sobre estas bases se examina la evolución de los conceptos centrales de la MCP, resaltando su pertinencia tanto en la medicina clínica como en la salud pública, la atención, educación e investigación y las políticas en salud. Con respecto a la práctica y educación clínicas, se plantea la noción de MCP como principio estratégico fundamental, sus aplicaciones educacionales programáticas, y su posible institucionalización a nivel de facultades de medicina. Se resalta la importancia de la formación en ética y comunicación clínica y del apropiado uso de la tecnología y la evidencia científica al servicio de la persona. Se incluyen posibilidades...


other Latin American National Academies of Medicine and important university and professional institutions related to the area of health. Objective: To describe and substantiate the importance of Person Centered Medicine (PCM) in the Latin American context. Methodology: Review of Latin American papers and experiences on this issue, and organization of academic meetings to deliberate on related problems, two preliminary ones in Lima in December 2013 and January 2014, a third one in Buenos Aires at the Second International Congress of Person Centered Medicine with the participation of National Academies of Medicine of Argentina, Bolivia, Chile and Peru (November, 2014), and a fourth in Lima with the presence of the National Academies of Medicine of Bolivia, Chile, Colombia, Paraguay and Peru (December, 2014). Results: Historical and contemporary, universal and local precedents to the gestation and development of a reprioritization of medicine in relation to the Person and his context are pointed out, articulating for such purpose science and humanism. The concept of Person in medicine from a philosophical point of view, including terminological historical and human rights dimensions, is discussed. Upon these bases the central concepts of PCM are examined emphasizing its pertinence in clinical medicine as well as in public health, clinical care, education, research, and health policies. In regards to clinical education and practice, the PCM concept as a fundamental strategic principle, its programmatic educational applications and its possible institutionalization at medical school level are proposed. The importance of ethical training and clinical communication as well as the appropriate use of technology and scientific evidence on behalf of the Person are highlighted. Available institutional opportunities for health professional interdisciplinary education as well as Latin American educational perspectives are discussed. Scientific research on PCM is...


Subject(s)
Humans , Patient-Centered Care , Education, Medical , Research , Health Policy
16.
Rev. lab. clín ; 7(2): 49-54, abr.-jun. 2014. tab
Article in Spanish | IBECS | ID: ibc-124999

ABSTRACT

Introducción: El establecimiento de los valores de referencia es una tarea esencial de los laboratorios clínicos, ya que pueden variar según los instrumentos empleados y la población considerada. En el presente trabajo pretendemos definir el intervalo de referencia en nuestra población para las siguientes magnitudes biológicas en plasma: osmolalidad, sodio, potasio, calcio, urea, y magnesio con el analizador Unicell DXC 800. Material y métodos: Se seleccionó una muestra de referencia formada por 146 individuos sanos entre los donantes que acudieron a nuestro banco de sangre y se les extrajo sangre en un tubo de heparina litio que fue centrifugado a 1.700 g durante 5 minutos para la obtención de plasma. En el plasma resultante se analizaron urea, sodio, potasio, calcio y magnesio con el analizador Unicell DXC 800 (Beckman Coulter®), midiéndose la osmolalidad con el osmómetro 3300 (Advanced Instruments®). Se aplicó el método no paramétrico del CLSI C28-A3 para la obtención de los valores de referencia. Resultados: Se obtuvieron los siguientes intervalos de referencia: urea (13,67-48 mg/dL), sodio: 136,7-145 mmol/L), potasio: (3,37-4,6 mmol/L), osmolalidad: (290-305,42 mosm/kg), calcio (8-9,3 mg/dL) y magnesio (1,9-2,2 mg/dL). Estos intervalos fueron diferentes a los propuestos por el fabricante, lo que refuerza la necesidad de producir valores de referencia propios (AU)


Introduction: The establishing of reference values is an essential task of clinical laboratories. In this work the reference intervals for the following parameters in plasma were determined: osmolality, sodium, potassium, calcium, magnesium and urea, using a Unicell DXC 800 analyzer (Beckman Coulter®). Material and methods: A sample of 146 healthy individuals was selected from health blood donors of our institution. Plasma was obtained by centrifugation of lithium heparin tubes at 1700 g for five minutes. Sodium, potassium, calcium, magnesium and urea were measured on a Unicell DXC 800 analyzer (Beckman Coulter®), whereas osmolality was measured with an osmometer (Advanced Instruments® 3300). The CLSI C28 A-3 non-parametric method was used to determine the reference intervals. Results: The reference intervals obtained were: osmolality: (290-305.42 mosm/kg), sodium: (136.7-145 mmol/L), potassium: (3.37-4.6 mmol/L), calcium (8-9.3 mg/dL), magnesium (1.9- 2.2 mg/dL) and urea (13.67-48 mg/dL). These values are different from those claimed by the manufacturer, which reinforces the need for determining individual reference values in each laboratory (AU)


Subject(s)
Humans , Osmolar Concentration , Electrolytes/blood , Calcium/blood , Magnesium/blood , Urea/blood , Reference Values , Sodium/blood , Potassium/blood
17.
Rev. lab. clín ; 6(4): 104-144, oct.-dic. 2013.
Article in Spanish | IBECS | ID: ibc-118162

ABSTRACT

Introducción. El equipo AQT90 FLEX es un analizador de sobremesa para inmunoanálisis que presenta características que lo hacen útil para su empleo a la cabecera del paciente. En el presente trabajo comparamos el método de la troponina I en sangre total en este equipo frente a la medida en plasma con 2 inmunoanálisis usados en los laboratorios centrales, como son Stratus® CS y Dimension(R) EXL. Material y métodos. Se obtuvieron 68 muestras de sangre recogidas en tubo de heparina litio. Las muestras se analizaron primero en el AQT90 FLEX y una vez liberados los tubos se centrifugaron, analizándose el plasma resultante por Stratus(R) CS y Dimension(R) EXL. Resultados. El análisis de regresión arrojó los siguientes ecuaciones: AQT = 0,006 + 0,22*Dimension con un coeficiente de correlación de 0,90 y AQT = 0,001 + 0,29*Stratus, siendo el coeficiente de correlación de 0,97, aunque se observaron diferencias constantes y proporcionales. Para la comparación entre los 2 métodos usados como referencia frente al método a evaluar se obtuvo la siguiente ecuación: Stratus = 0,0026 + 0,98*Dimension con un coeficiente de correlación de 0,99 en ausencia de errores (AU)


Background. AQT90 FLEX is a new bench top analyzer with performance characteristics that make it suitable for use in Point of Care. In this work we compare troponin I measured in whole blood with this analyzer and the plasma measurement using two immunoassays frequently used in core laboratories, such as Dimension(R) EXL and Stratus(R) CS. Methods. We collected 68 samples into lithium heparin tubes, which were analyzed on the AQT90 FLEX and then centrifuged and the plasma used for the measurement of troponin I using the Dimension(R) EXL and Stratus(R) CS. Results. The regression analysis yielded the following equations: AQT = 0.006 + 0.22*Dimension (r = 0.90) and AQT = 0.001 + 0.29*Stratus (r=0.97), although constant and proportional differences were observed in both comparisons. The comparison between Stratus(R) and Dimension(R) yielded the following equation: Stratus = 0.0026 + 0.98*Dimension (r = 0.99) with no constant errors in either of them (AU)


Subject(s)
Humans , Male , Female , Troponin I/analysis , Troponin I , Immunoassay/instrumentation , Immunoassay/methods , Immunoassay , Myocardial Infarction/diagnosis , Myocardial Infarction/pathology , Acute Coronary Syndrome/diagnosis , Immunoassay/trends , Regression Analysis , Confidence Intervals
18.
Rev. lab. clín ; 6(4): 168-171, oct.-dic. 2013.
Article in Spanish | IBECS | ID: ibc-118166

ABSTRACT

Introducción. Los niveles de paracetamol se miden habitualmente en los laboratorios de urgencias ante la evidencia o sospecha de una intoxicación para predecir la posible hepatotoxicidad aguda por este fármaco. Sin embargo varios estudios han reportado un falso incremento en la concentración de paracetamol medida por métodos enzimáticos en plasmas ictéricos, circunstancia que ocurre frecuentemente en casos de fracaso hepático. Material y métodos. Para evaluar la influencia de la bilirrubina en la medición de paracetamol en el analizador Dimension(R) EXL(TM) (Siemens Healthcare Diagnostics Inc.(R)) se preparó una solución primaria de interferente a una concentración de 800 mg/dl (13.680 μmol/l) que se añadió a una solución de control comercial con altos niveles de paracetamol hasta obtener una mezcla con una concentración de bilirrubina de 40 mg/dl (684 μmol/l) realizando la medición de paracetamol en esta mezcla y en una de referencia. Comprobada la existencia de interferencia se procedió a cuantificarla diluyendo la solución primaria hasta obtener mezclas con 20; 10; 5; 2,5; 1,25 y 0,625 mg/dl de bilirrubina (342; 171; 85,5; 42,75; 21,37 y 19,69 μmol/l). Se obtuvo el interferograma representando la desviación de la medida frente a la mezcla de referencia frente a las distintas concentraciones de interferente. Resultados. Las distribuciones fueron gaussianas, por lo que se pudo aplicar la t de Student para el cálculo de las significaciones estadísticas. Se demostró la existencia de una interferencia significativa negativa a partir de 5 mg/dl (85,5 μmol/l) de bilirrubina, lo que muestra que las mediciones de paracetamol deben interpretarse con cautela en casos de hiperbilirrubinemia (AU)


Background. Blood levels of acetaminophen (paracetamol) are measured routinely in large acetaminophen overdoses or when poisoning is suspected, in order to predict the likelihood of hepatotoxicity. However some cases of spurious acetaminophen levels have been reported in jaundiced patients. Material and methods. The interference of bilirubin in acetaminophen measurements was studied on the Dimension(R) EXL(T)M by preparing a primary mixture of bilirubin at 800 mg/dL, which was spiked to a quality control solution with high acetaminophen concentration in order to get a bilirrubin concentration of 40 mg/dl on the mixture. Acetaminophen concentration was measured in the mixture with bilirubin and in reference solution without bilirubin. Interference was assessed and quantified by diluting the bilirubin solution to achieve final concentrations of 20, 10, 5, 2.5, 1.25 and 0.625 mg/dl (342, 171, 85.5, 42.75, 21.37 and 19.69 μmol/l). A graph of the interference was obtained showing the bias of acetaminophen concentrations with reference solution vs. increasing bilirubin concentrations. Results. Acetaminophen concentrations in both solutions followed Gaussian distributions. The t test showed significant negative interference at bilirubin concentrations higher to 5 mg/dl (85.5 μmol/l), which means that blood acetaminophen concentrations must be interpreted with caution in cases of hyperbilirubinemia (AU)


Subject(s)
Humans , Male , Female , Hyperbilirubinemia/diagnosis , Acetaminophen , Indophenol/analysis , Indophenol , Receptors, Cell Surface/analysis , Receptors, Cell Surface/metabolism , Confidence Intervals , Bilirubin/analysis , Bilirubin , Colorimetry/methods , Colorimetry/standards , Colorimetry
19.
J Health Care Poor Underserved ; 24(4 Suppl): 48-60, 2013 Nov.
Article in English | MEDLINE | ID: mdl-24241260

ABSTRACT

Type 2 diabetes disproportionately affects Latinos increasing their risk of diabetes-related complications. This study used a randomized controlled design with a community-based approach to evaluate the impact of a culturally tailored pharmacist intervention on clinical outcomes in Latino diabetics. The intervention included a focused discussion and two individual pharmacist counseling sessions on medication, nutrition, exercise, and self-care to promote behavior changes. Sessions were culturally adapted for language, diet, family participation, and cultural beliefs. Clinical outcomes were measured at baseline and three months. Nineteen intervention and 24 control participants completed the study. Mean BMI reduction was greater for intervention than for control group participants (-0.73 ± 0.07 kg/m2 versus + 0.37 ± 0.02 kg/m2 p<.009 respectively). Hemoglobin A1c was significantly reduced by 0.93 ± 0.45% in the intervention group only. There was no significant difference in blood glucose, blood pressure, or lipid levels. An innovative culturally-sensitive pharmacist intervention improved selected clinical outcomes among Latino diabetics.


Subject(s)
Counseling , Diabetes Mellitus, Type 2/therapy , Health Behavior/ethnology , Hispanic or Latino , Pharmacies , Adult , Aged , Body Weight , Cultural Competency , Diabetes Mellitus, Type 2/blood , Diabetes Mellitus, Type 2/ethnology , Florida/epidemiology , Glycated Hemoglobin/analysis , Humans , Middle Aged , Pilot Projects , Self Care , Young Adult
SELECTION OF CITATIONS
SEARCH DETAIL
...