Uso de las reglas de Ottawa para medio pie y tobillo en un hospital de referencia en Perú / Use of Ottawa ankle rules in a referral hospital in Peru Perú

Objetivo: Evaluar la validez y seguridad de las reglas de Ottawa para medio pie y tobillo (ROmPT) en el servicio de urgencias de un hospital de referencia en Perú. Materiales y métodos: El estudio fue observacional, transversal con duración de 5 meses (de febrero a junio de 2016). La población fueron los pacientes mayores de 18 años con un traumatismo de pie y/o tobillo que acudieron al servicio de urgencias. Se realizó un muestreo no aleatorizado por conveniencia. Se aplicaron las ROmPT y se realizaron rayos X de pie y/o tobillo a los pacientes que cumplieron los criterios de inclusión y exclusión. Los datos fueron tabulados y analizados con el programa SPSS v. 20.0. Se calcularon medidas de validez diagnóstica (sensibilidad, especificidad), seguridad diagnóstica (valor predictivo positivo, valor predictivo negativo) y likelihood ratio positiva y negativa. Resultados: Se evaluaron 428 pacientes. El uso de las ROmPT obtuvo una sensibilidad del 97,2%, una especificidad del 30,3%, un valor predictivo positivo del 22,0%, un valor predictivo negativo del 98,2%, una likelihood ratio positiva de 1,39 y negativa de 0,09. Con la aplicación de las ROmPT, se evidenció una reducción del 31,2% del total de rayos X, que pudo generar un ahorro de 1.165$. Conclusiones: Se concluye que la validez y seguridad de las ROmPT en nuestro medio son comparables a las de estudios internacionales, con una posible reducción del uso de rayos X. Son necesarios estudios multicéntricos, con mayor tiempo de duración y cantidad de pacientes, para protocolizar el uso de este método en servicios de urgencias.(AU)

Objective: The aim of the study was to evaluate the validity and safety of Ottawa's ankle rules (OAR) in the urgency department of referral hospital in Peru. Materials and methods: An observational-transversal study was conducted for a duration of 5 months (April-June 2016). Target population were all patients older than 18 years with a foot and ankle injury who came to the urgency department. A convenience non-randomized sampling was used. The OAR test was applied and X-rays of the foot and/or ankle were performed in all patients who met the inclusion and exclusion criteria. The data obtained was analyzed using the SPSS 20.0 software. Sensitivity, specificity, positive predictive value, negative predictive value and likelihood ratio positive and negative were calculated from statistical analysis. Results: A total of 428 patients were evaluated. The OAR test's sensitivity was 97.2%, specificity was 30.3%, positive predictive value was 22.0%, negative predictive value was 98.2%, likelihood ratio positive and negative were 1.39 and 0.09, respectively. With the application of the OAR test, a reduction of 31.2% of the total X-rays was evidenced, which could generate a saving of US $1165. Conclusions: In conclusion, OAR's validity and safety in our environment are comparable to international data, with a reduction in the unnecessary use of radiographs. Multicentric studies involving a larger sample and longer study time are necessary to protocolize OAR in emergency units.(AU)

Use of Ottawa ankle rules in a referral hospital in Peru / Uso de las reglas de Ottawa para medio pie y tobillo en un hospital de referencia en Perú

Objetivo: Evaluar la validez y seguridad de las reglas de Ottawa para medio pie y tobillo (ROmPT) en el servicio de urgencias de un hospital de referencia en Perú. Materiales y métodos: El estudio fue observacional, transversal con duración de 5 meses (de febrero a junio de 2016). La población fueron los pacientes mayores de 18 años con un traumatismo de pie y/o tobillo que acudieron al servicio de urgencias. Se realizó un muestreo no aleatorizado por conveniencia. Se aplicaron las ROmPT y se realizaron rayos X de pie y/o tobillo a los pacientes que cumplieron los criterios de inclusión y exclusión. Los datos fueron tabulados y analizados con el programa SPSS v. 20.0. Se calcularon medidas de validez diagnóstica (sensibilidad, especificidad), seguridad diagnóstica (valor predictivo positivo, valor predictivo negativo) y likelihood ratio positiva y negativa. Resultados: Se evaluaron 428 pacientes. El uso de las ROmPT obtuvo una sensibilidad del 97,2%, una especificidad del 30,3%, un valor predictivo positivo del 22,0%, un valor predictivo negativo del 98,2%, una likelihood ratio positiva de 1,39 y negativa de 0,09. Con la aplicación de las ROmPT, se evidenció una reducción del 31,2% del total de rayos X, que pudo generar un ahorro de 1.165$. Conclusiones: Se concluye que la validez y seguridad de las ROmPT en nuestro medio son comparables a las de estudios internacionales, con una posible reducción del uso de rayos X. Son necesarios estudios multicéntricos, con mayor tiempo de duración y cantidad de pacientes, para protocolizar el uso de este método en servicios de urgencias.(AU)

Objective: The aim of the study was to evaluate the validity and safety of Ottawa's ankle rules (OAR) in the urgency department of referral hospital in Peru. Materials and methods: An observational-transversal study was conducted for a duration of 5 months (April-June 2016). Target population were all patients older than 18 years with a foot and ankle injury who came to the urgency department. A convenience non-randomized sampling was used. The OAR test was applied and X-rays of the foot and/or ankle were performed in all patients who met the inclusion and exclusion criteria. The data obtained was analyzed using the SPSS 20.0 software. Sensitivity, specificity, positive predictive value, negative predictive value and likelihood ratio positive and negative were calculated from statistical analysis. Results: A total of 428 patients were evaluated. The OAR test's sensitivity was 97.2%, specificity was 30.3%, positive predictive value was 22.0%, negative predictive value was 98.2%, likelihood ratio positive and negative were 1.39 and 0.09, respectively. With the application of the OAR test, a reduction of 31.2% of the total X-rays was evidenced, which could generate a saving of US $1165. Conclusions: In conclusion, OAR's validity and safety in our environment are comparable to international data, with a reduction in the unnecessary use of radiographs. Multicentric studies involving a larger sample and longer study time are necessary to protocolize OAR in emergency units.(AU)

Factors associated with infection of primary total knee prosthesis in older adults in a referral hospital in Peru. 2012-2015. / Factores asociados a infección de prótesis total de rodilla primaria en adultos mayores en un hospital de referencia en Perú. 2012-2015.

OBJECTIVE: To determine the risk factors associated with prosthetic knee infection in elderly patients in a referral hospital in Peru. PATIENTS AND METHODS: A case and control study was performed. The calculated sample was 44 cases and 132 controls. The data were collected retrospectively from clinical records. U-Mann Whitney and Chi-square tests were performed in the comparison of cases and controls. Odds ratios (OR) were calculated in a binary logistic regression analysis to identify the risk factors, a P<.05 and a 95% confidence interval (CI) were considered significant. RESULTS: Significant (P<.05) risk factors evidenced in the bivariate analysis were obesity (OR=9.72; 95%CI: 4.47-21.14), smoking (OR=4.06; 95%CI: 1.59-10.39), rheumatoid arthritis (OR=4.66; 95%CI: 1.52-14.32), diabetes mellitus type2 (OR=5.63; 95%CI: 2.69-11.78), persistent drainage (OR=9.27; 95%CI: 3.85-22.31), superficial infection (OR=6.87; 95%CI: 3.25-14.49) and prolonged hospital stay (OR=4.67; 95%CI: 2.26-9.64). In the multivariate analysis where it was adjusted for confounding variables, it was determined that risk factors were obesity (ORa=9.14; 95%CI: 3.28-25.48), diabetes mellitus (ORa=3.77; 95%CI: 1.38-10.32), persistent drainage (ORa=4.64; 95%CI: 1.03-20.80) and superficial wound infection (ORa=27.35; 95%CI: 2.57-290.64). CONCLUSIONS: Risk factors for prosthetic knee infection identified in this study are preventable. The main risk factors were obesity, diabetes mellitus type2, superficial wound infection and persistent drainage, which were considered together or separately to be risk factors in the population studied.