Pre-intensive care unit intubation and subsequent delayed intensive care unit admission is independently associated with increased occurrence of ventilator-associated pneumonia

Abstract

Introduction: Critically ill intubated patients are at risk for ventilator-associated pneumonia. However, intubation may not occur in intensive care unit (ICU) and subsequent ICU admission may be delayed.

Objectives: To evaluate whether intubation >24 h prior ICU admission and delay in ICU admission is associated with ventilator-associated pneumonia (VAP) in non-trauma critically ill patients.

Materials and methods: Prospective observational study conducted in a medical-surgical ICU of a tertiary hospital. Consecutive patients with >48 h of invasive mechanical ventilation and >72 h hospitalization, were recruited in the study. Pre-ICU intubation and delay in ICU admission, demographical, clinical, microbiological data and ICU interventions were assessed as risk factors for VAP and ICU mortality.

Results: 100 patients were included in the study. Pre-ICU intubation and delayed (>24 h) ICU admission (PDA patients) (P = 0.014, OR = 3.294, confidence interval 1.268-8.557) and SOFA score on ICU admission (P = 0.045, OR = 1.154, confidence interval 1.003-1.328) were independent risk factors for VAP in ICU care setting. Yet, PDA patients, presented significantly increased incidence of VAP due to MDR bacteria, mainly from Acinetobacter baumannii. Acinetobacter baumannii infection was the only independent risk factor for ICU mortality (P = 0.049, OR = 3.253, confidence interval 1.006-10.521). SOFA score on ICU admission, presented a fair prognostic accuracy of overall ICU mortality (SOFA ≥ 8.5, AUC = 0.850, P < 0.001).

Conclusions: Pre-ICU intubation and delayed ICU admission was independent risk factor for VAP Acinetobacter baumannii infection and a high SOFA score on ICU admission were predictors of increased ICU mortality.

Keywords: intensive care unit; intubation; ventilator associated pneumonia.