[Clinical features and outcome of community-acquired methicillin-resistant Staphylococcus aureus pneumonia]. / Características clínicas y pronóstico de la neumonía adquirida en la comunidad causada por Staphylococcus aureus resistente a la meticilina.

INTRODUCTION: The aim of this study is to describe the epidemiological and clinical features, treatment and prognosis of community-acquired pneumonia (CAP) caused by methicillin-resistant Staphylococcus aureus (MRSA) in two different geographic regions where community-acquired MRSA (CA-MRSA) infections have different frequencies. METHODS: Observational study of patients admitted to two hospitals (one in Argentina, the other in Spain) between March 2008 and June 2012. RESULTS: We documented 16 cases of CAP caused by MRSA. MRSA accounted for 15 of 547 (2.7%) cases of CAP in Hospital Rodolfo Rossi and 1 of 1258 (0,08%) cases at the Hospital Universitari de Bellvitge (P ≤ .001). Most patients were young and previously healthy. Multilobar infiltrates, cavitation and skin and soft tissue involvement were frequent. All patients had positive blood cultures. Five patients required admission to the intensive care unit. Early mortality (≤ 48 hours) was 19%, and overall mortality (≤ 30 days) was 25%. CONCLUSION: CAP caused by MRSA causes high morbidity and mortality rates. It should be suspected in areas with a high prevalence of CA-MRSA infections, and especially in young and healthy patients who present with multilobar pneumonia with cavitation. Mortality is mainly related to septic shock and respiratory failure and occurs early in most cases.

Características clínicas y pronóstico de la neumonía adquirida en la comunidad causada por Staphylococcus aureus resistente a la meticilina / Clinical features and outcome of community-acquired methicillin-resistant Staphylococcus aureus pneumonia

INTRODUCCIÓN: El presente estudio tiene como objetivo describir las características epidemiológicas, clínicas, el tratamiento y el pronóstico de una serie de casos de neumonía adquirida en la comunidad (NAC) por Staphylococcus aureus resistente a la meticilina (SARM) de 2 zonas geográficas con una frecuencia muy diferente de infecciones por SARM comunitario (SARM-Co). MÉTODOS: Estudio descriptivo de pacientes ingresados en 2 instituciones de Argentina y España entre marzo de 2008 y junio de 2012. RESULTADOS: Se documentaron 16 casos de NAC causada por SARM. La frecuencia fue de 15 de 547 (2,7%) casos totales de NAC en el Hospital Rodolfo Rossi y uno de 1.258 (0,08%) en el Hospital de Bellvitge (p ≤ 0,001). La mayoría de pacientes fueron jóvenes y no presentaban comorbilidades. La afectación multilobar, la cavitación y la afectación cutánea fueron frecuentes. Todos los pacientes presentaron hemocultivos positivos. Cinco pacientes requirieron ingreso en la UCI. La mortalidad precoz (≤ 48 h) fue del 18,7%, y la global (≤ 30 días), del 25%. CONCLUSIONES: La NAC causada por SARM causa una elevada morbimortalidad y debe sospecharse en áreas con alta prevalencia de infección por SARM comunitario, en especial en pacientes jóvenes sin comorbilidades que presentan una NAC multilobar con cavitación. La mortalidad se asocia a shock séptico e insuficiencia respiratoria y en la mayoría de los casos fue precoz

INTRODUCTION: The aim of this study is to describe the epidemiological and clinical features, treatment and prognosis of community-acquired pneumonia (CAP) caused by methicillin-resistant Staphylococcus aureus (MRSA) in two different geographic regions where community-acquired MRSA (CA-MRSA) infections have different frequencies. METHODS: Observational study of patients admitted to two hospitals (one in Argentina, the other in Spain) between March 2008 and June 2012. RESULTS: We documented 16cases of CAP caused by MRSA. MRSA accounted for 15 of 547 (2.7%) cases of CAP in Hospital Rodolfo Rossi and 1 of 1258 (0,08%) cases at the Hospital Universitari de Bellvitge (P ≤ .001). Most patients were young and previously healthy. Multilobar infiltrates, cavitation and skin and soft tissue involvement were frequent. All patients had positive blood cultures. Five patients required admission to the intensive care unit. Early mortality (≤ 48 hours) was 19%, and overall mortality (≤ 30 days) was 25%. CONCLUSION: CAP caused by MRSA causes high morbidity and mortality rates. It should be suspected in areas with a high prevalence of CA-MRSA infections, and especially in young and healthy patients who present with multilobar pneumonia with cavitation. Mortality is mainly related to septic shock and respiratory failure and occurs early in most cases