Divergent Functionalization of Styrenes via Radical/Polar Crossover with CO2 and Sodium Sulfinates.

Sulfones and carboxylic acids are prominent motifs widely present in the chemical structure of agrochemicals, pharmaceuticals and many other highly valuable compounds. Herein, we describe a conjunctive strategy for the precise installation of these functionalities onto styrenes using sodium sulfinates and CO2 as coupling partners. The protocol allowed the preparation of carboxy-sulfonylated compounds in good yields and broad functional group tolerance. Additionally, taking advantage of the leaving group ability of the sulfone moiety, a one-pot photocatalytic carboxy-sulfonylation-elimination strategy was developed for the synthesis of α-aryl-acrylates.

Nanoparticles for Triple Drug Release for Combined Chemo- and Photodynamic Therapy.

A pH-responsive drug delivery system (DDS) based on mesoporous silica nanoparticles (MSNs) has been prepared for the delivery of three anticancer drugs with different modes of action. The novelty of this system is its ability to combine synergistic chemotherapy and photodynamic therapy. A photoactive conjugate of a phthalocyanine (Pc) and a topoisomerase I inhibitor (topo-I), namely camptothecin (CPT), linked by a poly(ethylene glycol) (PEG) chain has been synthesized and then loaded into the mesopores of MSNs. Doxorubicin (DOX), which is a topoisomerase II inhibitor (topo-II), has also been covalently anchored to the outer surface of the MSNs through a dihydrazide PEG linker. In the acidic environment of tumor cells, selective release of the three drugs takes place. In vitro studies have demonstrated the endocytosis of the system into HeLa and HepG2 cells, and the subsequent release of the three drugs into the cytoplasm and nucleus. Furthermore, the cytotoxic effect of DOX, CPT and Pc has been assessed in vitro before and upon light irradiation.

[Clinical presentation of supratentorial and infratentorial intracranial tumors in pediatric patients]. / Presentación clínica de tumores intracraneales supratentoriales (ST) e infratentoriales (IT) en pacientes pediátricos.

BACKGROUND: Brain tumors are the second most common malignancy in childhood and they are also the most common solid tumors in children and the most frequent cause of morbidity and mortality associated with cancer in this age. OBJECTIVE: To determine the clinical presentation of supratentorial and infratentorial intracranial tumors in pediatric patients. MATERIAL AND METHODS: An observational, retrospective, cross-sectional comparative study in which records the clinical manifestations of 51 pediatric patients diagnosed with intracranial tumor, according with its location, supra- or infratentorial. RESULTS: 51 patients were analyzed. Tumor location was infratentorial in 32 patients (62.7%) and supratentorial in 19 (37.3%). Cerebellar syndrome occurred in 21 patients (65.6 %) with infratentorial tumor compared with six (31.5 %) with supratentorial tumor (p = 0.04; OR: 3.2; 95% CI: 1.1-12.8). Nystagmus was significantly more common in patients with infratentorial tumors (p = 0.029). Endocrine manifestations were present in four patients (21%) with supratentorial tumor and none of the infratentorial group (p = 0.03). CONCLUSIONS: Cerebellar syndrome was statistically significantly more common in patients with infratentorial when compared with patients with supratentorial. Nystagmus is one of the most common visual impairments in patients with infratentorial tumor. Endocrine disorders are significantly more frequent in patients with supratentorial tumor. The interval between onset of symptoms and diagnosis of intracranial tumor is significantly longer in children with supratentorial tumor because the symptoms are more insidious in onset and are mistaken for other benign conditions.

[Left ventricular adaptive response after surgery of aortic valve replacement for severe valvular stenosis]. / Respuesta adaptativa ventricular izquierda posterior a la cirugía de reemplazo valvular aórtico por estenosis valvular severa.

BACKGROUND: Myocardial hypertrophy is a compensatory mechanism in patients with severe aortic stenosis. The left ventricle fits the systolic pressure through a hypertrophic process with increased wall thickness. The effects of elevated ventricular afterload reduce ventricular myocardial elasticity and decrease coronary flow with increased myocardial work, oxygen consumption, and mortality. Aortic valve replacement surgery can cause regression of left ventricular hypertrophy and improve patient survival. The aim of this study was to evaluate left ventricular adaptive response after surgery of aortic valve replacement for severe valvular stenosis. MATERIAL AND METHODS: An observational, analytical, longitudinal study that included patients with diagnosis of aortic stenosis with evidence of left ventricular hypertrophy undergoing valve replacement during the period January 2013 to September 2014. Echocardiographic studies were performed before surgery and six months thereafter. Pre- and postoperative means were compared with Student t test for related samples. Statistical significance was considered at p ≤ 0.05. RESULTS: 24 patients were included, with an average age of 57.5 years, with no gender predominance, of which 87.5% had history of smoking and 50% with hypertension. There was no statistically significant difference in diastolic and systolic diameter before and after surgery. The interventricular septum was 14.9 ± 2.3 mm preoperative and 12.8 ± 2.2 mm postoperative (p = 0.001). The back wall was 14.2 ± 1.8 mm preoperative and 12.5 ± 2.2 mm postoperative (p = 0.002). The ventricular mass before surgery was 154.8 ± 54.3 g/m(2) and then 123.2 ± 41.4 g/m(2) (p = 0.000). The maximum preoperative transvalvular gradient was 93 ± 35 mmHg and postoperative was 32.2 ± 14.4 mmHg (p = 0.00). The average preoperative transvalvular gradient was 56.3 ± 19 mmHg and postoperative was 7.5 ± 16.49 mmHg (p = 0.00). CONCLUSIONS: The interventricular septum, posterior wall, and left ventricular mass decreased significantly after aortic valve replacement. The maximum and mean transvalvular gradient decreased significantly after surgery for aortic valve replacement.

Highlighting the adsorption mechanism of a fluoroquinolone antibiotic from wastewater on carbon xerogel by experiments, characterization, modelling and DFT simulation.

The application of a synthesized carbon xerogel (RFX) for the adsorptive removal from water of ciprofloxacin (CPX), a widely used fluoroquinolones-group antibiotic for humans and animals, has been reported in this work. The carbon xerogel was characterized by N2 adsorption-desorption isotherms, FTIR, Raman spectroscopy, TPD studies, elemental analysis, determination of isoelectric point (pHIEP) and scanning electron microscopy (SEM). CPX adsorption experiments were conducted in batch mode, using results obtained with F400 commercial activated carbon for comparison purposes. CPX adsorption kinetics were well-described by the pseudo-second-order model for both adsorbents and by the Elovich model in the case of F400 activated carbon. Therefore, CPX equilibrium adsorption capacity values were of 457 and 72 mg g-1 for RFX xerogel and F400 activated carbon, respectively. This significant difference can be attributed to the higher specific surface area and micropores volume values of F400 carbon; in this sense, this material led to a slower CPX kinetic adsorption. Also, the Dual-site Langmuir model best-described the experimental CPX adsorption isotherms in both cases. By the adsorption studies at different solution pH, it could be concluded that several mechanisms, e.g., hydrophobic and π-π interactions, and electrostatic forces highly influenced CPX adsorption capacity. Furthermore, adsorption tests using several environmentally relevant aqueous matrices have been accomplished. In this case, a competitive effect between the natural organic matter (NOM) and the target pollutant occurred in all the tested real matrices, decreasing CPX adsorption capacity, especially remarkable for F400 activated carbon. Finally, Density Functional Theory (DFT) has been used to elucidate the interactions between CPX and adsorbents, finding a high relevance of the π-π electron donor-acceptor interactions in which CPX acts as an acceptor.

Strangulated prolapsed ureterocele in an adult female.

Ureterocele is a cystic dilation of the distal ureter that exits into the urinary bladder. It is a rare condition in adults of which women are the most affected. Its clinical manifestations are very broad and among them the presence of a vulvar mass and symptoms of urinary obstruction stand out. We report the case of a strangulated ureterocele prolapse in a 54-year-old woman with a vulvar mass and signs of urinary obstruction. Initial management with reduction of the mass and finally decided to perform a ureteral reimplantation. Favorable evolution in medical follow-up.

Challenges in the diagnosis of hypervitaminemia B12. Interference by immunocomplexes.

BACKGROUND-AIM: High vitamin B12 concentrations are considered a common finding in clinical practice. Thanks to immunoassay accessibility, vitamin B12 has become a usual test in routine health checkups. However, these analytical methods usually present antibody-mediated interferences. Our aim was to propose an algorithm for the screening of antibody-mediated analytical interferences on vitamin B12 immunoassays on the Alinity platform. METHODS: Observational, prospective, case-control study was performed during 12 months. Individuals with persistently elevated cobalamin concentrations [>554 pmol/L] were considered as cases in the absence of supplementation or other justifying cause. Individuals under treatment with vitamin B12, or in the context of alcoholism were included as controls. A thorough interference study by macromolecules in immunoassays was performed in serum samples: PEG precipitation, rheumatoid factor, heterophile antibodies and gel permeation chromatography (GPC). Albumin, total B12, IgG and IgM were measured in every GPC collected fraction and chromatograms were drafted. RESULTS: Up to 45% of cases presented interference by B12-immunocomplexes and the precipitation for all of them was >50%. The individual with the lowest interfered vitamin B12 result was 661 pmol/L. CONCLUSION: The presence of antibody-mediated interferences, mainly B12-immunocomplexes, is a relatively common phenomenon. A simple algorithm for the screening of interferences is useful and reliable in ruling out healthy individuals and highly cost-effective.

Fournier's gangrene in a child with Hyper Immunoglobulin E syndrome.

Hyperimmunoglobulin E syndrome or Job syndrome is defined as an immune and connective tissue disorder that results in complications such as invasive infections. On the other hand, Fournier gangrene is a rapidly progressive necrotizing fasciitis that affects the perineal area, has a polymicrobial etiology, and its treatment consists of rapid and aggressive surgical debridement, antibiotic therapy, and hemodynamic support. We present the case of Fournier gangrene in an 11-year-old boy with a diagnosis of hyperimmunoglobulinemia E. who was admitted with scrotal necrosis with favorable evolution after initial medical management.

Giant Mature Ovarian Cystic Teratoma in a Pediatric Patient: Case Report and Literature Review.

Mature cystic teratomas, also called dermoid cysts, are the most common germ-cell ovarian neoplasms in children. On average, ovarian dermoid cysts are slow-growing neoplasms with a mean size between 6.4 and 7.0 cm that enlarge at a rate of 1.8 mm/year; however, these can reach large dimensions. Giant ovarian tumors are defined as those having a maximum diameter equal to or more than 15 cm; these represent a therapeutic challenge as they increase the risk of wide wound size and surgical invasiveness. In this paper, we present a case of a 10-year-old Hispanic female that complained of abdominal pain, distension, and nausea. Physical examination revealed a mass on the left side of the abdomen and an axial computed tomography found a large pelvic tumor extending to the abdominal region. After a laparotomy approach, pathology evaluation confirmed the diagnosis of mature cystic teratoma. The patient recovered thoroughly and had no complications at a 6-month follow-up. We conducted a literature review including English and Spanish reports about giant ovarian teratomas; we retrieved 16 cases from 2003 to 2023. We concluded that giant ovarian tumors may be underreported, particularly in resource-limited areas where tumors might grow unrecognized, and that English-language bias might play a substantial role in literature reviews involving case reports and case series.

Clinical Thresholds for Pseudohyperkalemia and Pseudonormokalemia in Patients with Thrombocytosis.

Background: The lysis of platelets during in vitro coagulation leads to increased potassium concentrations.We aimed to establish the cut-off value for platelet count interfering serum potassium and to estimate the percentage of cases of pseudohyperkalemia and pseudonormokalemia in our hospital. Materials and methods: Individuals diagnosed with essential thrombocytosis (2010-2019) based on the WHO criteria for the classification of myeloid neoplasms and acute leukemia were considered.The cut-off value for the interference of platelet count on serum potassium results was calculated using the reference change value. Sensitivity and specificity were calculated using a ROC-curve, and the size of the effect by the Cohen's d.The clinical impact of both phenomena was assessed by reviewing the medical records of individuals classified as such, and also looking for potential cases in 2019 on the laboratory information system. Results: Fifty-four individuals with essential thrombocytosis were included. Potassium concentration correlated with platelet count (P-value<0.001; Spearman's ρ =0.394) in serum. The cut-off value of platelet count interfering potassium was 598x103/µL [CI95%: 533-662x103/µL], with an associated sensitivity and specificity of 0.67 [CI95%:0.52-0.80] and 0.58 [CI95%:0.42-0.72] respectively.The medical records of patients classified as pseudohyperkalemia or pseudonormokalemia did not include any medical action for the modification of potassium levels. In 2019, up to 0.14% of the total serum potassium determinations were susceptible to be pseudohyperkalemia or pseudonormokalemia. Conclusion: This study provides a cut-off value for platelet count interfering serum potassium concentrations, and brings to light not only pseudohyperkalemia-related issues, but also the pseudonormokalemia phenomenon, which usually goes unnoticed.

Monitoring of Diabetic Patients with Poor Glycemic Control.Are International Recommendations Met?

BACKGROUND-AIM: Diabetes mellitus is one of the most prevalent diseases worldwide. According to the ADA 2020 guidelines, individuals with unstable glycemic control should be monitored every three months by measuring glycated hemoglobin (HbA1c). The aim of this study was to evaluate the demand adequacy for HbA1c in the monitoring of patients with diabetes mellitus with a highly unstable glycemic control. METHODS: Retrospective observational study (2016-2019). All HbA1c tests from individuals ≥18 years requested by hospital physicians were considered.Highly unstable glycemic control was defined as HbA1c≥10.0%, and their monitoring was classified as: optimal, out of recommendations (if>3months) and lack of monitoring if no further HbA1c measurement was performed by the laboratory.For individuals classified as lack of monitoring, medical records were reviewed and further re-classified as: [1] due to patient's responsibility, [2] attributable to the requesting physician, [3] monitored by POCT, [4] unfeasibility of monitoring or [5] referral outside our area for follow-up. RESULTS: During the assessed period, 1,156 patients had an HbA1c value≥10.0%. 67.5% of them were monitored either in the clinical laboratory or as POCT (33.7% optimal monitoring), whereas 21.0% patients were not monitored due to preventable situations. CONCLUSION: Lack of monitoring due to physician's reasons or patient's responsibility highlights the urgent need for an improvement.

Pancreatic Cancer Insights: Optimization of the Diagnostic Capacity of Tumor Biomarkers.

OBJECTIVE: Pancreatic cancer (PC) is one of the deadliest malignancies. The aim of this study was to determine the usefulness of the carbohydrate antigen 19.9 (CA19.9)/ carcinoembryonic antigen (CEA) ratio as a diagnostic tool. METHODS: This was a retrospective observational study (2015-2019), including laboratory requests with increased CA19.9 and CEA but no previous neoplasia. Receiver operating characteristic (ROC) curve analyses were performed for the CA19.9/CEA ratio and for CA19.9 and CEA alone for the detection of PC, and cutoff values for all strategies were selected separately and in combination. RESULTS: A total of 373 individuals were included. The area under the curve (AUC) for CA19.9/CEA was 0.872, whereas the AUC for CA19.9 was 0.847 and for CEA was 0.554. Cutoff values with the greatest diagnostic power were CA19.9/CEA >40, CA19.9 >1130 U/mL, and CEA > 14.5 U/mL. The combination of CA19.9/CEA > 40 with CA19.9 > 550 U/mL maximized the diagnostic accuracy for PC. CONCLUSION: Our results highlight the relevance of the measurement of serum CA19.9 and CEA in the detection of PC.

Challenges in screening for congenital hypothyroidism: Optimization of thyrotropin cut-off values.

BACKGROUND-AIM: Different protocols exist for newborn screening of congenital hypothyroidism (CH) worldwide, with different thyrotropin cut-off values for repetition and confirmation tests. This study aimed to assess local protocol in terms of specificity and improve our screening process by optimizing thyrotropin cut-off values. Subsequently, the cut-off values obtained were retrospectively applied to evaluate the number of tests avoided. METHODS: Retrospective observational study between 2013 and 2019. All newborn children with a confirmation test for CH were considered for the study. ROC curve analysis was performed for thyrotropin cut-off value optimization in DBS which triggers a confirmatory test, and odds ratios were calculated. For individuals affected by the cut-off value modification, serum thyrotropin and free thyroxine in the confirmation test were analyzed for consideration of clinical outcomes. RESULTS: A total of 72,133 newborn children were screened for CH, and 208 individuals were included in the study. Incidence in our population was 1:2,000 live births. The area under the ROC curve was 0.819 (CI 95%: 0.748-0.897). While the current cut-off value (thyrotropin ≥ 10mIU/L) had a specificity of 31.8% [ORs: 3.5 (CI 95%: 1.4-8.8)], the optimal cut-off value (thyrotropin ≥ 15mIU/L) yielded a specificity of 92.4% for the detection of CH and transient hypothyroidism [ORs: 15.9 (CI 95%: 7.1-35.8)], with no loss of sensitivity. DISCUSSION: While keeping a maximum sensitivity, optimization of cut-off values may be of great use not only in management, but also in reducing family stress, which is of special relevance for the newborn.

Use of data mining in the establishment of age-adjusted reference intervals for parathyroid hormone.

BACKGROUND-AIM: Appropriately defined reference values are of vital importance for the correct interpretation of laboratory results. However, the implementation of in-house reference intervals by traditional methods is rare due to difficulties in the selection of reference individuals, so indirect methods are often alternatively used. Parathyroid hormone (PTH) is a crucial hormone for the metabolism of calcium and phosphorus whose result can lead to erroneous diagnoses and medical actions if adequate reference intervals are not readily available. Our goal was to obtain reference values ​​for adult population for PTH by using data mining. Based on possible new reference intervals, we also aimed to perform a retrospective evaluation of the individuals mistakenly classified. METHODS: Retrospective observational study between 2014 and 2019. All requests from individuals aged ≥ 18 years were considered if PTH was requested together with serum creatinine, 25-hydroxyvitamin D, calcium, albumin and phosphate (within their respective reference intervals). PTH was measured on the Cobas e411 platform (Roche). Requests were grouped by age and sex. Differences among partitions were assessed by the Harris-Boyd's test and reference intervals were determined by the non-parametrical calculation of percentiles 2.5 and 97.5. RESULTS: A total of 2279 laboratory requests were included. Reference intervals for PTH were seen to be sex-independent, but age-dependent reference intervals were needed: 18-39, 40-59 and >60 years. Based on the reference intervals obtained, up to 20.1% of individuals were misclassified. CONCLUSIONS: Appropriateness of PTH reference intervals would lead to a reduction in the number of additional tests and avoid wrong medical actions, thus improving not only patient safety, but also the healthcare system as a whole.

Photoredox Catalysis toward 2-Sulfenylindole Synthesis through a Radical Cascade Process.

A radical cascade process initiated through visible-light induced thiyl radical coupling with ortho-substituted arylisocianides followed by an intramolecular cyclization and subsequent aromatization to access 2-sulfenylindoles is described. The key thiyl radicals are promptly generated via a hydrogen atom transfer event. The redox-neutral protocol features broad substrate scope, excellent functional group tolerance, and mild reaction conditions. Furthermore, the implementation of a continuous flow variant allows smooth scalability with a short residence time through process intensification.

Optimization of the thyroid panel for diagnostic purposes: Thyrotropin cut-off values for the reflex addition of free thyroxine.

BACKGROUND-AIM: Measurement of serum thyrotropin is currently the recommended test for the screening of thyroid dysfunction, while serum free thyroxine is kept as a reflex test. In our laboratory, the strategy followed in adult individuals from Primary Care includes a 'safety margin' for requests with a thyrotropin ≤1.0 or ≥4.0 mIU/L (normal: 0.35-4.95 mIU/L). Our aim was to optimize the thyrotropin cut-off values for the addition of free thyroxine and, based on these cut-offs, to retrospectively analyze avoidable free thyroxine measurements and possible adverse clinical consequences. METHODS: Retrospective observational study performed in a tertiary care hospital between 2013 and 2018. We considered all laboratory requests for screening of thyroid dysfunction (TD) in adult patients from Primary Care. Requests from patients with a previous diagnosis of thyroid disease or pregnant women were excluded. Different receiver operating characteristic (ROC) curves were performed and the obtained thyrotropin cut-off values were compared. Economic savings were assessed considering the current cost of free thyroxin assays in our laboratory. RESULTS: From a total of 554,529 TD protocols included, 119,504 requests had free thyroxine added. From the ROC curve that enables ≥95% of abnormal free thyroxine results to be detected, the thyrotropin values obtained were ≥4.58 mIU/L and ≤0.94 mIU/L. These thyrotropin cut-off values would lead to a saving of 22.7% of annual free thyroxine measurements without adverse clinical consequences. DISCUSSION: Setting optimized thyrotropin cutoffs for reflex testing of free thyroxine would reduce the need for this test. Clinical laboratories need to offer not only true results, but also become the cornerstone in the optimization of resources.

Prevalence of hypertriglyceridemia in adults and related cardiometabolic factors. SIMETAP-HTG study. / Prevalencia de hipertrigliceridemia en adultos y factores cardiometabólicos asociados. Estudio SIMETAP-HTG.

AIM: To determine in the adult population the crude and the sex- and age-adjusted prevalence rates of hypertriglyceridaemia (HTG) and to assess its association with cardiovascular risk factors, chronic kidney disease, cardiovascular and cardiometabolic diseases. METHODS: Cross-sectional observational study conducted in Primary Care, with 6,588 adult study subjects, randomly selected on base-population. Patients had HTG if the triglyceride level was≥150mg/dL (≥1.7mmol/L), or were on lipid-lowering therapy to lower triglyceride. Associations were assessed by univariate and multivariate analysis, and crude and sex- and age-adjusted prevalence rates were determined. RESULTS: The arithmetic and geometric means of triglyceride levels were respectively 120.5 and 104.2mg/dL in global population, 135.7 and 116.0mg/dL in men, and 108.6 and 95.7mg/dL in women. The crude HTG prevalence rates were 29.6% in global population, 36.9% in men and 23.8% in women. The sex- and age-adjusted HTG prevalence rates were 27.0% in global population, 34.6% in men and 21.4% in women. The independent variables that were most associated with HTG were hypercholesterolemia (OR: 4.6), low HDL-C (OR: 4.1), hepatic steatosis (OR: 2.8), diabetes (OR: 2.0), and obesity (OR: 1.9). CONCLUSIONS: The means of triglyceride levels and HTG prevalence rates are intermediate between those of other national and international studies. A fifth of the female adult population and more than a third of the male population had HTG. The independent factors associated with HTG were hypercholesterolemia and low HDL-C, and the cardiometabolic variables diabetes, hepatic steatosis and obesity.

Real-World Evidence: Multicenter Efficacy and Toxicity Analysis of Nintedanib With Docetaxel as Second-Line Treatment in Mexican Patients With Advanced Lung Adenocarcinoma.

PURPOSE: The LUME-Lung 1 study has brought consistent evidence of the effective use of nintedanib in lung adenocarcinoma as a second line of treatment; however, differences among ethnicities have been found in some studies. METHODS: This was a retrospective review among 21 medical centers of 150 patients with a confirmed diagnosis of lung adenocarcinoma, included in a compassionate use program of nintedanib from March 2014 to September 2015. The current study aimed to analyze the effectiveness of nintedanib in combination with docetaxel in the Mexican population, using progression-free survival rate and the best objective response to treatment by RECIST 1.1 as a surrogate of effectiveness. In addition, we examined the toxicity profile of our study population as a secondary end point. RESULTS: After exclusion criteria, only 99 patients met the criteria for enrollment in the current study. From the total study population, 53 patients (53.5%) were male and 46 (46.5%) were female, with an average age of 60 years and stage IV as the most prevalent clinical stage at the beginning of the compassionate use program. A total of 48 patients (48.5%) had partial response; 26 (26.3%), stable disease; 4 (4%), complete response; and 16 (16.2%), progression; and 5 (5%) were nonevaluable. We found a median progression-free survival of 5 months (95% CI, 4.3 to 5.7 months). The most common grade 3 or 4 adverse reactions were fatigue (14%) and diarrhea (13%). CONCLUSION: Nintedanib, as part of a chemotherapy regimen, is an effective option with an acceptable toxicity profile for advanced lung adenocarcinoma after first-line treatment progression.

Hemolysis Interference Studies: The Particular Case of Sodium Ion.

BACKGROUND: Despite many studies assessing hemolysis interference in almost every clinically relevant magnitude, sodium has poorly been assessed. Our aim was to evaluate hemolysis interference on plasma sodium, using different strategies of hemolysis preparation, at different baseline sodium ion concentrations and bias specifications. METHODS: Two different strategies were used for the preparation of hemolysis from lithium heparin blood samples. Repeatibility was calculated at two levels for each strategy and interferograms were outlined for both approaches at sodium concentrations between 130-145 mmol/L. Results were interpreted according to different specifications: reference change value, RiLiBAK, Westgard's database, RCPA-QAP and CLIA. RESULTS: The coefficients of variation of the hemolyzed samples using the first strategy were lower than for the second strategy (0.23-0.78% vs 0.57-48.6%, for 0.2 g/dL free Hb and 0.28-0.44% vs 0.40-135.1%, for 0.9 g/dL free Hb). Statistically significant differences were seen when comparing the slopes of the pairs of interferograms at each sodium concentration obtained by both strategies (p<0.001 for 130 mmol/L; p=0.068 for 135 mmol/L; p=0.002 for 140 mmol/L and p=0.001 for 145 mmol/L). Hemolysis cut-off values were generally independent of the sodium concentration. CONCLUSIONS: Reproducibility of hemolysate preparation is procedure-dependent. A greater standardization is needed for the preparation of a true hemolysate to better quantify the degree of interference of clinically relevant analytes, especially those with higher complexity such as sodium. We found a concentration-independent cut-off value for the hemolysis index that allows the establishment of a single and robust value in every laboratory, according to their quality specifications.

Aplicación tópica de ácido tranexámico en urología: ¿Una alternativa de manejo? / Topical Application of Tranexamic Acid in Urology: An Alternative Management?

Los agentes antifibrinolíticos, como el ácido tranexámico, por medio de su administración endovenosa se usan en distintos procedimientos quirúrgicos para prevenir la pérdida de sangrado perioperatorio.[1] Este medicamento es un derivado sintético análogo de la lisina que bloquea los sititos de unión de la lisina en el plasminógeno, inhibiendo su conversión a plasmina e interfiriendo en la fibrinólisis.[2] La aplicación del ácido tranexámico para disminuir el riesgo de sangrado ha sido utilizado en procedimientos urológicos como la resección transuretral prostática (RTUP), prostatectomía radical y nefrolitotomía percutánea (NLP),[3] [4] [5] también se emplea para disminuir las hematurias persistentes en pacientes con poliquistosis renal y en otras hematurias macroscópicas de origen urológico.

Antifibrinolytic agents, such as tranexamic acid, by intravenous administration are used in various surgical procedures to prevent perioperative bleeding loss.[1] This drug is a synthetic lysine analog derivative that blocks the lysine binding sites on plasminogen, inhibiting its conversion to plasmin and interfering with fibrinolysis.[2] The application of tranexamic acid to reduce the risk of bleeding has been used in urological procedures such as transurethral resection of the prostate (TURP), radical prostatectomy and nephrolithotomy. The application of tranexamic acid to reduce the risk of bleeding has been used in urological procedures such as transurethral resection of the prostate (TURP), radical prostatectomy and percutaneous nephrolithotomy (PNL),[3] [4] [5] it is also used to reduce persistent hematuria in patients with polycystic kidney disease and other macroscopic hematuria of urological origin.