Outcomes of patients ventilated with synchronized intermittent mandatory ventilation with pressure support: a comparative propensity score study.

Abstract

BACKGROUND:

Few data are available regarding the benefits of one mode over another for ventilatory support. We set out to compare clinical outcomes of patients receiving synchronized intermittent mandatory ventilation with pressure support (SIMV-PS) compared with assist-control (A/C) ventilation as their primary mode of ventilatory support.

METHODS:

This was a secondary analysis of an observational study conducted in 349 ICUs from 23 countries. A propensity score stratified analysis was used to compare 350 patients ventilated with SIMV-PS with 1,228 patients ventilated with A/C ventilation. The primary outcome was in-hospital mortality.

RESULTS:

In a logistic regression model, patients were more likely to receive SIMV-PS if they were from North America, had lower severity of illness, or were ventilated postoperatively or for trauma. SIMV-PS was less likely to be selected if patients were ventilated because of asthma or coma, or if they developed complications such as sepsis or cardiovascular failure during mechanical ventilation. In the stratified analysis according to propensity score, we did not find significant differences in the in-hospital mortality. After adjustment for propensity score, overall effect of SIMV-PS on in-hospital mortality was not significant (odds ratio, 1.04; 95% CI, 0.77-1.42; P = .78).

CONCLUSIONS:

In our cohort of ventilated patients, ventilation with SIMV-PS compared with A/C did not offer any advantage in terms of clinical outcomes, despite treatment-allocation bias that would have favored SIMV-PS.

• Authors: Guillermo Ortiz, Fernando Frutos-Vivar, Niall D Ferguson, Andres Esteban, Konstantinos Raymondos, Carlos Apezteguía, Javier Hurtado, Marco González, Vinko Tomicic, José Elizalde, Fekri Abroug, Yaseen Arabi, Paolo Pelosi, Antonio Anzueto, Ventila Group
• Journal: Chest (Chest) Vol. 137 Issue 6 Pg. 1265-77 (Jun 2010) ISSN: 1931-3543 [Electronic] United States
• PMID: 20022967 (Publication Type: Comparative Study, Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't)

Topics

• APACHE
• Chi-Square Distribution
• Cohort Studies
• Female
• Hospital Mortality
• Humans
• Intermittent Positive-Pressure Ventilation (methods, mortality)
• Logistic Models
• Male
• Middle Aged
• North America
• ROC Curve
• Respiratory Insufficiency (mortality, therapy)
• Severity of Illness Index
• Statistics, Nonparametric
• Treatment Outcome
• Ventilator Weaning