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Update. Consensus on Ventilator Associated Pneumonia.Second Part: ProphylaxisVentilator associated pneumonia is a life threatening disease, in spite of advances in its treatment, consequently the development of prevention strategies is a key factor in improving the morbidity and mortality in intensive care units (ICU). The new developments in this fi eld in the last years led to the need to update the recommendations done in 2001. Then, a new search and analysis of scientifi c literature was performed. The obtained data support different strategies highlighting: semi-recumbent position at 45° of patients; incorporation of routinely oral hygiene procedures with chlorhexidine; preference of orotracheal intubation; performing subglotic aspiration; use of standard hand hygiene techniques; not routine change of ventilator circuits; and defi ning bundles to organize the work at ICU. Some strategies were recommended for being of similar effi cacy to others but cost-effective as: use of heat and moisture humidifi cators; and changing humidifi cators every 5 to 7 days. The use of open or closed endotracheal suctioning system does not affect the incidence of pneumonia. Some recommendations were not incorporated because of lack of evidence supporting effectiveness, controversial data or doubtful application to our country as selective digestive decontamination.Key words: Prevention, ventilator-associated pneumonia, guidelines, mechanical ventilation, consensus. Palabras clave: Prevención, neumonía asociada a ventilación mecánica, guías clínicas, ventilación mecánica, consenso. Universidad Austral de Chile, Valdivia (MCA).Hospital San Borja Arriarán, Santiago (LDM).Hospital Padre Hurtado, Santiago. Enfermera Control de IAAS (ECV).Hospital Clínico Universidad IntroducciónL a neumonía asociada a ventilación mecánica (NAVM) se mantiene como una entidad de alta mortalidad que afecta a las poblaciones sometidas a este procedimiento. A pesar de que se han diseñado estrategias para iniciar un tratamiento oportuno y apropiado, mejorando el pronóstico de mortalidad de los enfermos, no es menos cierto que la mortalidad atribuible es aún elevada con una terapia adecuada. Por esto, el desarrollo y ejecución de medidas de prevención adecuadas parece ser uno de los esfuerzos más acertados para la disminución de la morbi-mortalidad asociada a este cuadro.En los últimos nueve años, el desarrollo de la literatura científi ca enfocada a este aspecto ha sido enorme y muy variado, incluyendo nuevos tipos de intervenciones, a la vez que ha intentado esclarecer la utilidad de las más antiguas; por otro lado, en otras se ha logrado tener un mejor dato respecto a su evidencia, así como en algunas, por el poco tiempo de desarrollo que llevan, no ha sido posible dar una recomendación con la misma calidad de fundamento.Como se ha mencionado previamente, este artículo es parte de la actualización del consenso realizado, con anterioridad, por la Sociedad Chilena de Infectología en el año 2001. La metodología nuevamente ha buscado realizar recomendacio...

Sociodemographic risk factors of hantavirus cardiopulmonary syndrome Background: Hantavirus cardiopulmonary syndrome (HCPS) is caused by new world hantaviruses, among which Andes hantavirus (ANDV) is endemic to Chile and Southern Argentina. The disease caused by ANDV produces plasma leakage leading to enhanced vascular permeability and has a high case fatality rate (35%), mainly due to respiratory failure, pulmonary edema and myocardial dysfunction, hypoperfusion and shock. Host sociodemographic and genetic factors might influence the course and outcome of the disease. Yet, they have not been thoroughly characterized. Aim: To evaluate sociodemographic factors as risk factors in severity of HCPS. Patients and Methods: Study period: 2004-20013, attending in eight collaborative centers, etiological diagnosis was performed by serology or molecular biology, mild and severe HCPS were compared.139 Chilean patients were analyzed, 64 (46%) with severe disease among which 12 (19 %) died. Results: European ethnicity had 5,1 times higher risk than Amerindian ethnic group to develop a severe HCPS, greater seriousness that was also associated with an urban residence. Conclusion: It was observed that ethnicity and type of residence were significant risk factors for HCPS severity. Hypotheses explaining these findings are discussed.