Resultado de los primeros 2 años de implementación de un protocolo ERAS o STAR (eSTrategias para Adelantar la Recuperación) en un hospital público de Chile

Introducción: Las herramientas que han demostrado ser más eficaces en el manejo perioperatorio, corresponden a los protocolos ERAS o STAR (eSTrategias para Adelantar la Recuperación) como nombre local. Objetivo: Describir los resultados obtenidos luego de 2 años de implementación del protocolo STAR en estadía hospitalaria, complicaciones y reingresos. Objetivo secundario describir adherencia al protocolo. Material y Método: Estudio de cohorte retrospectivo no concurrente, en cirugía colorrectal electiva. Enero-diciembre 2016 manejo no protocolizado (grupo no-STAR), agosto 2018 a julio 2020 manejo protocolo STAR (grupo STAR). Registro de variables demográficas, adherencias, complicaciones y reingreso. Se utilizaron variables continuas (cuartiles, promedio y DE), test t-Student, test de Wilcoxon, variables categóricas (frecuencias y porcentajes), test de Fisher y Propensisty Score (PS). Resultados: 239 pacientes; grupo no-STAR 85 pacientes (35,5%), grupo STAR 154 (64,5%), sexo masculino 111 pacientes (43 no-STAR p = 0,347). Promedio edad no-STAR 64,2 (SD 14,7) vs. STAR 66,3 (SD 14,39) (p = 0,3147). Mediana de estadía no-STAR 5 días (promedio 6,9, SD 6,2) y STAR 3 días (promedio 4,8 días, SD 4,4). No-STAR tuvo 22 complicaciones (25,9%) vs 28 STAR (18,2%) p = 0,185. No-STAR 7 reingresos vs 17 STAR (p = 0,654). Análisis de covarianza días de hospitalización ajustado por sexo, edad y cirugía laparoscópica, grupo STAR produce 1,93 días menos de hospitalización (p = 0,005) y PS disminuye en 1,92 días la estadía hospitalaria (p-value = 0,007). Discusión y Conclusión: La implementación de un protocolo de recuperación avanzada logra la reducción de 2 días en la estadía hospitalaria de los pacientes sometidos a una cirugía colorrectal, sin aumentar complicaciones, mortalidad ni reingresos.

Introduction: >Enhanced recovery after Surgery (ERAS) or STAR are the tools that have proven to be more effective in perioperative management. Objective: Primary objective is to describe the results obtained regarding complications, hospital stay and readmissions after 2 years of implementation of the STAR. Secondary objective is to describe protocol adherence. Materials and Method: Non-concurrent retrospective cohort study, in patients with elective colorectal surgery. From January to December 2016 non-protocolized management (non-STAR group), August 2018 to July 2020 STAR protocol management (STAR group). Registration of data like the demographic variables, adherence to protocol, complications and readmissions. Continuous variables (quartiles, mean and SD), t-Student test, Wilcoxon test, categorical variables (frequencies and percentages), Fisher test and propensity score (PS) were used. Results: 239 patients; non-STAR group 85 patients (35.5%), STAR group 154 (64.5%), male 111 patients (43 non-STAR p = 0.347). Average age non-STAR 64.2 (SD 14.7) vs STAR 66.3 (SD 14.39) (p = 0.3147). Median non-STAR stays 5 days (average 6.9, SD 6.2) and for STAR 3 days (average 4.8 days, SD 4.4). Non-STAR had 22 complications (25.9%) vs 28 STAR (18.2%) p = 0.185. No-STAR 7 hospital readmissions vs 17 STAR (p = 0.654). Analysis of covariance (ANCOVA) for hospitalization days adjusted by gender, age and laparoscopic surgery shows 1.93 less hospitalization days (p = 0.005); Propensity Score (PS) shows reduced hospital stay in 1.92 days (p-value = 0.007). Discussion and Conclusión: The implementation of an advanced recovery protocol achieves a reduction of 2 days in the hospital stay of patients undergoing colorectal surgery, without increasing complications, mortality or readmissions.

Caracterización de lesiones duodenales y su sobrevida / Characterization of duodenal lesions and their survival

Resumen Introducción: Las lesiones duodenales son infrecuentes. Objetivo: Caracterizar a los pacientes con lesiones duodenales observados entre enero de 2008 y diciembre de 2013 en el Servicio de Salud Metropolitano Sur, en Santiago de Chile. Materiales y Método: Se obtuvieron los datos de los registros del Hospital Barros Luco Trudeau y Hospital El Pino. Los pacientes incluidos fueron los observados entre enero de 2008 y diciembre de 2013. Se analizaron edad, género, características clínicas, localización, métodos diagnósticos, hallazgos anatomopatológicos y tratamiento. El 24 de abril de 2019 se obtuvo la fecha de fallecimiento de todos los pacientes del Registro Civil. El análisis estadístico se realizó con el software STATA 15.1. Resultados: Se encontraron 157 pacientes con lesiones duodenales, 65 presentaron adenocarcinoma duodenal y 71 pacientes pólipos duodenales, 25 de ellos fueron adenomas. Análisis univariado de sobrevida evidenció que los pacientes con pólipos asociado a carcinoma y los adenocarcinomas duodenales, presentaron una sobrevida inferior (p = 0,013, HR 6,584 y p < 0,001, HR 7,604, respectivamente). En los pacientes con adenocarcinoma duodenal, aquellos que se sometieron a una cirugía con intención curativa, y aquellos que recibieron quimioterapia tuvieron una sobrevida global mejor que aquellos que no recibieron terapia (p < 0,001, HR 0,351 y p = 0,001, HR 0,276, respectivamente. Discusión: La incidencia estimada del adenocarcinoma duodenal en nuestra población es de 1,1 por cada 100.000 habitantes, la que es más alta que otras publicadas. Proponemos estudio endoscópico en poblaciones de riesgo y tratamiento con intención curativa para los pacientes con adenocarcinoma duodenal sin metástasis a distancia.

Introduction: Duodenal lesions are infrequent. Aim: To characterize patients with duodenal lesions observed between January 2008 and December 2013 at the Southern Metropolitan Health Service, in Santiago, Chile. Materials and Method: Data were obtained from the Barros Luco Trudeau Hospital and El Pino Hospital records. The patients included were those observed between January 2008 and December 2013. Age, gender, clinical characteristics, location, diagnostic methods, anatomopathological findings and treatment were analyzed. On April 24th 2019 was obtained the date of death of all patients at the National Civil Registry. The statistical analysis was performed with the software STATA 15.1. Results: 157 patients with duodenal lesions were found, 65 presented duodenal adenocarcinoma and 71 patients had duodenal polyps, 25 of them were adenomas. Univariate analysis of survival showed that patients with polyps associated with carcinoma and duodenal adenocarcinomas had a lower survival rate (p = 0.013, HR 6.584 y p < 0.001, HR 7.604, respectively). In patients with duodenal adenocarcinoma, those who underwent surgery with curative intent, and those who receive chemotherapy had a better overall survival than those who did not received therapy (p < 0.001, HR 0.351 y p = 0.001, HR 0.276, respectively). Discussion: We propose endoscopic study in at-risk populations and treatment with curative intent for patients with duodenal adenocarcinoma without distant metastases. The estimated incidence of duodenal adenocarcinoma in our population is 1.1 per 100,000 inhabitants and seem to be higher than other published.

Factores de riesgo de ocurrencia y gravedad de malformaciones congénitas / Identification of risk factors for congenital malformations

Background: The relative importance of congenital malformations as a cause of death in the first year of life is increasing along with the control of preventable causes of perinatal mortality. Aim: To identify risk factors for congenital malformations. Patients and Methods: Retrospective case-control study of births registered in the database of The Latin American Collaborative Study of Congenital Malformations (ECLAMC), in the period 2001-2010. Results: Birth weight and gestational age were significantly lower in cases than controls, behaving as risk factors and associated with a greater severity of congenital malformations. The risk and severity of congenital malformations increased along with mother’s age. Fetal growth retardation, a history of congenital malformations in the family, physical factors and acute illnesses of the mother in the first trimester of pregnancy were also significant risk factors for congenital malformations and their severity. The educational level of the mother was a protective factor for congenital malformations and their severity. Conclusions: Variables previously identified as risk factors for congenital malformations, were significantly related with the occurrence of congenital malformations and their severity.

[Identification of risk factors for congenital malformations]. / Factores de riesgo de ocurrencia y gravedad de malformaciones congénitas.

BACKGROUND: The relative importance of congenital malformations as a cause of death in the first year of life is increasing along with the control of preventable causes of perinatal mortality. AIM: To identify risk factors for congenital malformations. PATIENTS AND METHODS: Retrospective case-control study of births registered in the database of The Latin American Collaborative Study of Congenital Malformations (ECLAMC), in the period 2001-2010. RESULTS: Birth weight and gestational age were significantly lower in cases than controls, behaving as risk factors and associated with a greater severity of congenital malformations. The risk and severity of congenital malformations increased along with mother's age. Fetal growth retardation, a history of congenital malformations in the family, physical factors and acute illnesses of the mother in the first trimester of pregnancy were also significant risk factors for congenital malformations and their severity. The educational level of the mother was a protective factor for congenital malformations and their severity. CONCLUSIONS: Variables previously identified as risk factors for congenital malformations, were significantly related with the occurrence of congenital malformations and their severity.

La autoevaluación es un método poco confiable para establecer el desarrollo puberal en escolares / Self evaluation is not reliable for assessing puberal development in school-aged children

Introduction: Puberal development assessment (PDA) is performed according Tanner's method (TM). Objective: In order establish the coincidence between PDA determined by physicians and the self-evaluation by school-aged children. Material and Methods: 2 980 school children from Santiago, Chile, were assessed by means of TM, the development of the mammary gland (MD), male genitalia (MG) and pubic hair (PH) were assessed. PDA was simultaneously performed by physicians and by the school children. Results: Concordance between physicians and self assessment showed a kappa coefficient (KC) of 0.55, 0.45, and 0.51 in PH, MD and MG respectively, (acceptable KC > 0.61). Self-evaluation of PDA decreased as the age of children increased, with OR of 0.76 (95 percent IC 0.74 -0.79); 0.87 (95 percent IC 0.83 - 0.91) and 0.92 (95 percent IC 0.88 - 0.96) for PH, MD and MG respectively. An inverse relationship between nutritional status (NS) and PDA was observed only in PH, obese school children underscored their PH (OR 0.6; 95 percent IC 0.5 - 0.7). Multivariate analysis for gender and NS showed that only females overestimate their PH, OR of 1.15 (95 percent IC 1-1.32). Conclusions: PDA through self-assessment yields only moderate correlation coefficients, thus it is not reliable for making relevant clinical decisions.

Introducción: La determinación del desarrollo puberal (DDP) se evalúa según el método de Tanner (MT). Objetivo: Determinar la concordancia de la DDP entre médicos con la autoevaluación en escolares. Pacientes y Métodos: Se examinaron 2 980 escolares de Santiago de Chile. Se evalúo desarrollo mamario (DM), genitales masculinos (GM) y vello púbico (VP) mediante el MT. La DDP fue evaluada simultáneamente por un médico y por los escolares. Resultados: La concordancia entre médicos y la autoevaluación mostró un coeficiente kappa (CK) de 0,55, 0,45, 0,51 en VP, DM y GM respectivamente, (CK aceptable > 0,61). La autoevaluación del DDP disminuyo a medida que aumentaba la edad, con OR respectivos de 0,76 (95 por ciento IC 0,74-0,79); 0,87 (95 por ciento IC 0,83-0,91) y 0,92 (95 por ciento IC 0,88 -0,96) para VP, DM y GM. Se observo una relación inversa entre estado nutricional (EN) y DDP sólo en VP, escolares obesos subestimaban su VP (OR 0,6; 95 por ciento IC 0,5-0,7). El análisis multivariado de género y EN mostró que sólo las mujeres sobreestimaban su VP, OR de 1,15 (95 por ciento IC 1-1,32). Conclusiones: La DDP mediante autoevaluación obtiene coeficientes de correlación sólo moderados que no permiten confiar en este para establecer decisiones clínicas relevantes.

Sensibilidad diagnóstica de los distintos tiempos de la prueba de estímulo con clonidina, indicada para descartar deficiencia de hormona de crecimiento en niños con talla baja / Timing of growth hormone peaks during the clonidine provocation test

Background: Clonidine provocative test is used for the diagnosis of growth hormone (GH) deficiency. The duration of the test is not uniform across places where it is performed. Aim: To evaluate the frequency and timing of GH peaks during the clonidine test. To determine the timing with the highest diagnostic yield for GH deficiency. Patients and Methods: Analysis of the GH response during a clonidine test performed to 93 children with low stature, aged 11 +/- 3 years (41 percent women), with mean z scores of -2.3 +/- 0.8 for height and of 0.4 +/- 0.9 for body mass index, that were consecutively studied. A oral dose of 0.15 mg/m2 of clonidine was administered and GH levels were determined by the chemiluminescent enzyme immunoassay method of solid phase at 0, +30, +60, +90 and +120 minutes after. The cut-off point for GH deficiency was set at 7 ng/dL. Results: In ten children GH levels were lower than 7 ng/dL during the test and were considered as having GH deficiency. In 86 percent of the 83 patients without GH deficiency, the peak over 7 ng/mL appeared at +60 minutes and in 89 percent the peak had appeared at +90 minutes. In only 11 percent of these children, the peak appeared at +120 minutes. Conclusions: The timing with the highest diagnostic yield for GH is +60 minutes after the administration of clonidine. However the sample at +120 minutes should not be eliminated, considering that the highest GH peak appears at that time in 11 percent of children.

Evaluación de un programa integral de tratamiento de obesidad y sobrepeso en niños escolares y adolescentes en Santiago de Chile (1999-2006) / Assessment of a multidisciplinary program for the treatment of obesity in children

Background: Medical treatment of obesity requires a multidisciplinary approach including dietary, exercise and behavioral interventions. Aim: To report the results of a multidisciplinary program for the treatment of obesity in children. Patients and Methods: Three hundred twenty four children (155 males), aged between 5 and 18 year, were treated with diet, exercise and behavioral modification, between 1999 and 2006. At baseline and at the end of follow up, weight, height, z score for body mass index (BMI), blood pressure and features of the metabolic syndrome were assessed. Results: z scores for IMC decreased by 0.28 points (95 percent confidence intervals: -0.31 to -0.25). Sixty percent of patients achieved a weight reduction of 5 percent of more of their initial weight. In a multiple linear regression model, weight loss was directly associated with the follow up time and inversely associated with the initial waist circumference. Patients had a reduction of 0.05 z score points of BMI per month (95 percent confidence intervals –0.07 to –0.025; p < 0.001), while adhering to the program. The overall compliance with the three months treatment period was 59 percent. Conclusions: In children and teenagers, a multidisciplinary management of obesity achieves a sustained weight loss, that ifs proportional to the lapse of adherence to the program.

Cáncer de cuello uterino: sobrevida a 3 y 5 años en Hospital San José / Cervical cancer: survival at 3 and years in Hospital San Jose, Chile

Antecedentes: El cáncer cérvico uterino es la quinta causa de muerte por cáncer en la mujer chilena. Objetivo: Comparar entre agosto de 1999 y diciembre de 2002 la sobrevida por cáncer cérvico uterino según estadio clínico a 3 y 5 años diagnosticados en la Unidad de Patología Cervical del Hospital San José. Método: La sobrevida se calculó con la totalidad de casos de cáncer cérvico uterinos diagnosticados, su estadio y mortalidad a 3 y 5 años obtenidos a través del Registro Civil de Chile. Resultados: La distribución por estadio fue: 22,2 por ciento para estadio I, 21,3 por ciento para estadio II, 53,7 por ciento para estadio III y 2,7 por ciento para estadio IV. En estadio I la sobrevida a 3 años fue de 83 por ciento (IC: 61,5 - 93,4) y a 5 años de 78 por ciento (IC: 55,5 - 90,5); en estadio II fue de 65 por ciento (IC: 42,4 - 80,8) y de 60 por ciento (IC: 38,3 - 77,4), respectivamente; en estadio III fue de 33 por ciento (IC: 21,6 - 45,5) y 29 por ciento (IC: 18,6 - 41,9), respectivamente; y en estadio IV la mortalidad a 3 y 5 años fue de 100 por ciento produciéndose el deceso durante los tres primeros meses desde su diagnóstico. Conclusión: La sobrevida se correlaciona directamente con el estadio clínico en el momento del diagnóstico, independiente de la edad de la paciente, debiendo aumentar la cobertura del tamizaje, mejorando los tiempos de confirmación diagnóstica y tratamiento óptimo, como también mejorando los sistemas de redes y registros.

Background: Cervical cancer is the fifth cause of death by cancer in Chilean women. Objectives: To compare between August 1999 and December 2002 the survival of cervical cancer according to a clinical stage in 3 and 5 years diagnosed in the Cervical Pathology Unit of San José Hospital. Methods: The overall survival rate was calculated with the totality of diagnosed cervical cancer, his stage and mortality in 3 and 5 years was obtained through the National Registry Office. Results: The distribution for stage was: 22.2 percent for stage I, 21.3 percent for stage II, 53.7 percent for stage III and 2.7 percent for stage IV. In stage I the survival at 3 years was 83 percent (Cl: 61.5 - 93.4), and at 5 years 78 percent (Cl: 55.5 - 90.5). In stage II the survival at 3 years was 65 percent (Cl: 42.4 - 80.8) and at 5 years 60 percent (Cl: 38.3 - 77.4). In stage III the survival at 3 years was 33 percent (Cl: 21.6 - 45.5) and at 5 years 29 percent (Cl: 18.6 - 41.9). In stage IV the mortality at 3 and 5 years was 100 percent produced during the first 3 months from the diagnosis. Conclusions: The survival is directly correlative with the clinical stage in the moment of the diagnosis, independent of the age of the patients, by which it must increase the screening coverage, improving the times of diagnostic confirmation and optimum treatment, and also improving the network systems and registries.

Suspensión transvaginal alta a ligamentos uterosacros para el tratamiento de defectos apicales (stalus): descripción de la técnica y resultados anatómicos a mediano plazo / High uterosacral vaginal vault suspension for the treatment of apical prolapse: anatomical outcomes

Objetivos: Describir una técnica quirúrgica, novedosa en el medio nacional, de abordaje vaginal, para el tratamiento del prolapso apical: la suspensión transvaginal alta a ligamentos úterosacros (STALUS). Método: Estudio descriptivo longitudinal, de 57 pacientes con defectos apicales, a los cuales se les realizó esa técnica entre Diciembre de 2002 y Octubre 2005. Se realizó estadística descriptiva y test t (2 muestras) para análisis de pronóstico anatómico (POP-Q). Para análisis de potenciales factores pronósticos se utilizó ANOVA, regresión lineal y logística. Resultados: El tiempo operatorio promedio fue de 151 minutos. El resultado anatómico (POP-Q), pre y postoperatorio, resultó favorable y estadísticamente significativo, en los nueve puntos evaluados, 49 de las 54 pacientes fueron seguidas en promedio durante 15 meses. En el compartimiento apical (punto C) obtuvimos curación del 89 por ciento y no hubo fracasos. En la pared anterior, 22 por ciento de las pacientes recidivaron. En cuanto a las complicaciones, se produjo una fístula ureterovaginal. Conclusiones: Tomando las precauciones necesarias, es una técnica segura y reproducible, con buenas tasa de curación. Asegurar la indemnidad del uréter, siempre será una obligación. La recidiva en pared anterior, aunque sea asintomática, resulta ser extremadamente alta, lo que nos obliga a pensar en nuevas técnicas de abordaje de este compartimiento.

Objective: To describe a novel surgery technique in the national ground, of vaginal approach for the treatment of apical prolapse: the transvaginal high suspension to the uterosacral ligaments (STALUS). Method: It is a longitudinal descriptive study that included 57 patients with apical support defects, in which this technique was performed between December 2002 and October 2005. Descriptive statistics and t test were per-formed for the anatomical outcome (POP-Q). For the potential prognosis factors, ANOVA, lineal regression and logistic, were used. Results: The average surgery time was 151 minutes. The anatomical result (POP-Q), before and after surgery, was favourable and significant in the nine points evaluated. 49 of 54 patients were followed for 15 months in average. In the apical compartment (C point) we got an 89 percent of cure and there were no failure. In the anterior wall, instead, 22 percent of our patients recurred. About complications, there was an ureterovaginal fistula. Conclusions: If all precautions are taking, there is a secure and reproducible technique, with good cure rate. To secure the ureter it is always an obligation. The recurrence in the anterior wall, even been asymptomatic, is too high, that make us think in new techniques in order to manage this compartment.

Retiro precoz de esteroides en la inmunosupresión del trasplante renal pediátrico / Early steroid withdrawal in pediatric renal transplantation

Background: Cardiovascular risk, growth failure and the new immunosuppressive drugs, have encouraged steroid withdrawal or total avoidance with promising results in renal transplant (Tx) immunosuppression. Aim: To evaluate a new immunosuppressor protocol with early withdrawal of steroids in pediatric kidney transplant. Patients and methods: Prospective study in pediatric patients older than 1 year and low immunological risk. Group A (n =28): steroids in decreasing doses until day 7 post Tx, tacrolimus (FK) and micophenolate mofetil (MMF). Group B (n =28) control: steroids, cyclosporine and azathioprine or steroids, FK and MMF. In both groups the induction therapy included basiliximab. Anthropometric and biochemical variables (renal function, lipid profile, hematological, blood glucose and acid-base equilibrium), acute rejection and CMV infection, were evaluated. Mean values and variations for continuous variables were calculated at months 1, 6, 12 and 18. Results: Two children were withdrawn before month 2, one had an untreatable diarrhea and the second died due to Aspergillus septicemia. Mean values at months 1, 6, 12 and 18 for groups A and B: Creatinine clearence (ml/min): 85.4 vs 89; 79.9 vs 83; 89 vs 80; 79.8 vs 80.6 (p: ns); hematocrit ( percent): 28.8 vs 30.4; 31.7 vs 34.4; 34.4; 32.4 vs 34.8; 34.4 vs 35.5 (p: ns). Total cholesterol (mg/dl): 151 vs 206; 139 vs 174; 138 vs 186; 140 vs 180 (p <0.05). Mean delta height/age Z score at the first year: 0.5 vs 0.15; 0.7 vs 0.22; 0.97 vs 0.25 (p <0.05). Mean systolic blood pressure Z score: 0.9 vs 1.5; 0.5 vs 0.9; -0.3 vs 0.8; 0.1 vs 1.0 (p <0.05). The height/age Z score was significantly superior in patients without steroids. A normalization of growth patterns at month 18 was observed (< 0.05). Both groups presented a negative variation of creatinine clearance during the follow-up, but it was minor in the study group (p <0.05). Two acute rejections were found in each group, and no difference in CMV infections...

Características de la insuficiencia cardíaca en pacientes con fracción de eyección preservada: Resultados del Registro Nacional de Insuficiencia Cardíaca, Grupo ICARO / Characteristics of heart failure with preserved ejection fraction: Results of the Chilean National Registry of Heart Failure, ICARO

Background: Heart failure (HF) with preserved ejection fraction (EF) is a condition of growing interest due to its high prevalence and difficult management. Aim: To evaluate the clinical profile of patients hospitalized with HF and preserved EF in Chilean hospitals. Material and Methods: Prospective registry of 15 centers. Among 649 patients hospitalized in functional class III and IV, an echocardiogram was performed to 353. Preserved EF was defined quantitatively as an EF >50%. Results: Out the 353 patients, 45% presented an EF >50%. Mean age in patients with EF >50 and ­50% was 66±13 and 67±13 years, respectively. Among patients with HF and EF >50%, the proportion of women was higher (73.7 and 36.3%, p <0.001), the proportion of patients with a history of hypertension (76.8 and 65.5%, p <0.05) and the presence of atrial fibrillation was also higher (62.3 and 47.8%, p <0.01) and a history of myocardial infarction was lower (17.1 and 29.5%, p <0.05). The diastolic diameter of the left ventricle was significantly lower in HF with preserved EF (51.0+10 and 63.5+10 mm respectively, p <0.001). No differences in the length of hospital stay and mortality were observed between HF with depressed and preserved EF. Female gender was an independent predictor for the presence of HF with preserved EF (Odds ratio: 2.62; confidence intervals: 1.1-6.1). Conclusions: HF and preserved EF is common among hospitalized patients, particularly in women and subjects with a history of hypertension and atrial fibrillation. Hospitalization length and mortality were similar in patients with either preserved or depressed EF.

Dosis de diálisis, nutrición y crecimiento en diálisis peritoneal pediátrica / Dialysis dose, nutrition and growth among pediatric patients on peritoneal dialysis

Stunting is common among pediatric patients on peritoneal dialysis. Aim: To stablish the best profile for urea kinetic variables associated to growth inchildren on chronic peritoneal dialysis (PD). Patients and Methods: Twenty patients, aged 1 month to 14 years, 13 males, were followed for 6-12 months, with monthly measurements of weight/age and height/age Z score; plasma creatinine, BUN, protein and albumin and urine and dialysate urea nitrogen, creatinine, protein and albumin. Minimum total Kt/V was 2.1. Dialysis dose (Kt/V), Protein Equivalent of Urea Nitrogen Appearence (PNA), Protein Catabolic Rate (PCR) and Nitrogen Balance (NB) were calculated. To identify the variable(s) associated to growth, the Tree Classification Model (CART) Enterprise Miner 8.1 was applied. Results: Mean total/residual Kt/V: 3.4±1.3/1.69±1.27; Daily Protein Intake (DPI) was 3.25±1.27 g/kg/day. nPNA, PCR and NB were 1.37±0.44, 0.84±0.33 and 1.86±1.25 g/kg/day, respectively. Mean heigth/age Z score was -2.3±1.19. Eleven patients showed a positive height/age delta Z (mean 0.55±0.38) and nine showed a negative growth (mean -0.50±0.42). The main variable explaining the positive growth was a Nitrogen Balance between 0.54 and 2.37 g/kg/ day, mean 1.55±0.21 (p <0.001). The second associated variable to growth was a residual Kt/V between 0.43 and 4.6 (2.02±0.49) (p <0.05). Kt/V and nPNA showed a significant correlation, but no correlation could be found between Kt/V and NB. Conclusions: Nitrogen Balance was the main variable associated to growth in pediatric PD, with values between 0.53 to 2.38 g/kg/day. The second variable was a residual Kt/V between 0.43 and 4.6. Therapy should be reassessed with NB values less than 0.54 or above 2.37 g/kg/day....

El sistema de la bolsa es útil como espaciador para la administración de los aerosoles presurizados / A plastic bag is useful as spacer device for pressurized aerosol delivery

It has been demostrated that the effect of inhaled medications is enhanced by spacer devices, but their sizes make them unpractical to carry around and they have additional cost. In order to test if a homemade cheap spacer is as effective as the commercial spacers, we tested a small plastic bag with a cardboard mouth piece. We recluted 17 patients over 16 years of age with an obstructive ventilatory limitation in spirometry with a significative response with 200 µg of albuterol. We randomized patients into two groups: one received the bronchodilator through a commercial spacer and the other through the homemade device. We observed that with the latter we obtained similar or better FEV1 and FVC increases. We conclude that the use of this cheap device can be used in patients with advantage over commercial ones.

Se ha demostrado que el depósito y efecto de los medicamentos administrados a través de los inhaladores presurizados mejora con el uso de espaciadores, pero la adherencia a estos accesorios no es buena por su costo y por su tamaño incómodo. Nuestro objetivo fue determinar si un sistema artesanal tipo reservorio, armado con una bolsa plástica unida a una boquilla de cartón, es efectivo como espaciador. Para esto, seleccionamos a 17 sujetos mayores de 16 años con espirometría con limitación ventilatoria obstructiva y respuesta espirométrica significativa a 200 µg de salbutamol en aerosol presurizado. Se les asignó aleatoriamente a dos grupos: uno con aerocámara y otro con bolsa. Con esta última se obtuvo aumento del VEF1 y de la CVF post broncodilatador de mayor magnitud que con la aerocámara, con diferencia estadística significativa. Nos parece que estos resultados validan al sistema de la bolsa como espaciador de aerosoles presurizados para el uso de los pacientes.

Obesidad: factor de riesgo para esteatohepatitis y fibrosis hepática / Obesity as a risk factor for steatohepatitis and hepatic fibrosis

Background: Nonalcoholic fatty liver (NAFL) has been recognized as a cause of chronic liver disease. Its main risk factor is obesity. Aim: To describe the clinical and liver pathological findings in a group of patients who underwent surgery as obesity treatment. Patients and Methods: Sixty eight patients with severe or morbid obesity were subjected to surgery as obesity treatment. Each patient was evaluated with a complete clinical and laboratory medical assessment. A wedge of liver was excised during surgery. Liver biopsies were analyzed without knowledge of clinical and laboratory findings. The presence of steatosis, inflammation (portal or lobular), fibrosis and cirrhosis were recorded in the pathological analysis. Age and body mass index (BMI) were correlated with pathological data. Significance was set at a p value of less than 0.05. Results: Ninety one percent of patients had steatosis, 45 percent inflammation and 47 percent fibrosis. One patient had cirrhosis (1,4 percent). There was a statistically significant association between BMI and moderate or severe steatosis (p <0.03). There was also an association between BMI and portal (p=0.017) and lobular inflammation (p=0.034). A BMI over 40 kg/m2 (morbid obesity) was significantly associated with the presence of fibrosis (p=0.032). Moreover, the presence of moderate or severe steatosis was a risk factor for the development of hepatic fibrosis (p=0.026). Conclusions: Obesity is a major and independent risk factor for steatohepatitis and fibrosis. The degree of steatosis in the liver biopsy, is a risk factor for the development of fibrosis

Rol de la histeroscopía en la evaluación del factor uterino en la pareja infértil / Hysteroscopy role in study of the uterine factor in the infertile couple

Se evaluó retrospectivamente los hallazgos a la histerosalpingografía (HSG) e histeroscopia (HTC) en el estudio del factor uterino en la pareja infértil durante el período comprendido entre enero de 1995 y mayo de 2000 (n=65). El análisis estadístico mostró un pobre grado de concordancia entre ambos exámenes (46,15 por ciento; p 0,068). La sensibilidad de la HSG con respecto a la HTC fue de un 91 por ciento, sin embargo, su especificidad alcanzó sólo un 12, 5 por ciento con una elevada tasa de falsos positivos (87,5 por ciento). Se comnparan y discuten los resultados con lo comunicado en la literatura. Concluimos que la HTC supera a la HSG en el estudio del factor uterino. Sugerimos considerar a la HTC como el examen inicial y de elección para la evaluación del factor uterino

Un método universal para corregir la subnotificación en enfermedades transmisibles: incidencia real de la hidatidosis humana en Chile: 1985-1994 / A method to correct undernotification of transmissible diseases: incidence of real human hydatidosis in Chile

Background: There is evidence to postulate that undernotification is the reason for the great decrease in the reported incidence of hydatidosis in Chile. Aim: To develop and propose a method to assess the notification of transmissible diseases, based on observed lethality and hospital discharges. Material and methods: Human hydatidosis in the period 1985-1994 was used as a model to develop the method. Official reports and mortality were analyzed first, determining the first lethality rate. A second lethality rate was calculated based on hospital discharges and a third, based on all Chilean surgical series published in the last two decades. Adjusting official notification of lethality to the true lethality according to surgical series, the number of unreported cases was calculated and the true incidence of hydatidosis was calculated, summing these cases to the official notification. Results: According to this method, the real rates of human hydatidosis in the period 1985-1994, would fluctuate between 6.5 and 11.4 per 100,000. This figure is four times higher than the official notification in the analysed period. Conclusions: The correction of under notification based on hospital discharges, with or without correction for repeated hospital admissions, or real mortality of surgical series gave similar results, suggesting that both methods are correct

Colecciones abscedadas pelvianas en el Hospital Barros Luco Trudeau: estudio de 5 años / Pelvic abscess colections at Hospital Barros Luco Trudeau: 5 years study

La enfermedad inflamatoria pelviana (EIP) constituye un importante problema de Salud Pública. Una de sus complicaciones más serias es el absceso tubo ovárico. El absceso pelviano es capaz de generar importante morbi-mortalidad. Presentamos experiencia de 5 años (1 de noviembre de 1991 al 31 de octubre de 1996), en el manejo médico-quirúrgico de 98 pacientes con colecciones abscedadas pelvianas, y comparamos nuestros resultados con estudios publicados. Realizamos un estudio retrospectivo de las pacientes que egresaron con diagnóstico de algún tipo de colección abscedada pelviana. Comparamos el grupo de pacientes con tratamiento médico conservador (TMC), con otro que requirió además tratamiento quirúrgico (TQ). Se estudiaron 98 casos de absceso pélvico. Observamos una tendencia a la resolución quirúrgica de ellos entre los años 1996, lo que es estadísticamente significativo. Sólo el 21 por ciento respondió a TMC, casi el 80 por ciento requirió TQ. La causa principal de la cirugía fue la falta de respuesta al TMC. El tipo principal de intervención realizada fue la anexectomía (44 por ciento). El 51 por ciento de los TQ se complicó, casi todos por infección de herida operatoria. La falta de sospecha de EIP, en las pacientes operadas fue de 9 por ciento. Las usuarias de DIU, no presentaron mayor riesgo estadístico de TQ. La fiebre al ingreso resultó un factor protector frente a la TQ. La proteína C, reactiva (PCR) fue el único examen de laboratorio que resultó ser un factor de riesgo de TQ. La extracción de DIU después del ingreso es factor protector frente a la TQ. El riesgo de rehospitalización es menor en las pacientes sometidas a TQ. Conclusión. Un enfoque o manejo agresivo diferido ( a la semana) sería lo más adecuado para estas pacientes, ya que esto, nos ha permitido realizar operaciones menos radicales con conservación de anexo, morbilidad menos grave que la observada en el pasada, y sin mortalidad. El esquema antibiótico triasociado de penicilina, cloramfenicol, gentamicina, clásicamente empleado en nuestros servicios públicos tendría pobre efecto sobre la evolución del absceso pelviano establecido

Extracción parahisteroscópica de dispositivo intrauterino / Parahysteroscopic technic for the removal of intrauterine device

Se presenta la experiencia con el uso de la técnica de extracción de DIU bajo visión histeroscópica y paralelo al histeroscopio (parahisteroscópica) en 544 pacientes derivadas desde los consultorios del área norte de Santiago para extracción de DIU entre enero de 1995 y noviembre de 1998 en la Unidad de Histeroscopia del Servicio de Ginecología y Obstetricia del Hospital San José. La extracción de los DIU por vía parahisteroscópica fue exitosa en un 95,1 por ciento un 2 por ciento se extrajo con pinza Bosseman o crochet, siendo frustra en sólo un 2,9 por ciento por mala tolerancia al procedimiento. A partir de 1997 se evaluó la tolerancia al procedimiento en función del dolor en tres categorías: mínimo, regular y más que regular, para lo cual se administró premedicación desde 1998 y cuya variante elevó la buena tolerancia desde un 65,52 por ciento al 80,95 por ciento, lo que tiene significación estadística (p = 0,002). Hubo complicaciones en el 2,94 por ciento de los casos, tales como desgarros de cuello, omalgia y endometritis y una reacción vagal. Todas respondieron al manejo habitual y ambulatorio. Proponemos la técnica parahisteroscópica como un método de rutina para la extracción de DIU dada su alta efectividad, mínima morbilidad y buena tolerancia en los centros que dispongan de una Unidad de Histeroscopia

Dimetilnitrosamina y antioxidantes: cáncer vesicular experimental / Dimethylnitrosamine and antioxidants: experimental gallbladder neoplasms

Este tipo de estudio tiene especial interés para Chile dado el notable incremento de este cáncer, el cual se mantiene hasta la actualidad (1.628 muertes y tasa de 11,5 por 100.000 en 1995). La especie usada fue el hamster (Mesocricetus auratus) y un carcinógeno, la dimetil nitrosamina, fue administrado por vía oral, en una dosis establecida. Se formaron 3 grupos de 20 animales cada uno, por un tiempo que alcanza los seis meses. El primer grupo se organizó como control. El grupo control ha tenido muertes espontáneas después del primer año de vida y no ha mostrado ningún cáncer vesicular. Los otros dos grupos tienen muy poco tiempo de evolución para extraer conclusiones en relación a cáncer, pero habría un efecto protector de los antioxidantes