Effect of a nurse-implemented sedation protocol on the incidence of ventilator-associated pneumonia*

Objective:To determine whether the use of a nurse-implemented sedation protocol could reduce the incidence of ventilator-associated pneumonia in critically ill patients. Design:Two-phase (before–after), prospective, controlled study. Setting:University-affiliated, 11-bed medical intensive care unit. Patients:Patients requiring mechanical ventilation for ≥48 hrs and sedative infusion with midazolam or propofol alone. Interventions:During the control phase, sedatives were adjusted according to the physician’s decision. During the protocol phase, sedatives were adjusted according to a protocol developed by a multidisciplinary team including nurses and physicians. The protocol was based on the Cambridge scale, and sedation level was adjusted every 3 hrs by the nurses. Standard practices, including weaning from the ventilator and diagnosis of VAP, were the same during both study phases. Measurements and Main Results:A total of 423 patients were enrolled (control group, n = 226; protocol group, n = 197). The incidence of VAP was significantly lower in the protocol group compared with the control group (6% and 15%, respectively, p = .005). By univariate analysis (log-rank test), only use of a nurse-implemented protocol was significantly associated with a decrease of incidence of VAP (p < .01). A nurse-implemented protocol was found to be independently associated with a lower incidence of VAP after adjustment on Simplified Acute Physiology Score II in the multivariate Cox proportional hazards model (hazard rate, 0.81; 95% confidence interval, 0.62–0.95; p = .03). The median duration of mechanical ventilation was significantly shorter in the protocol group (4.2 days; interquartile range, 2.1–9.5) compared with the control group (8 days; interquartile range, 2.2–22.0; p = .001), representing a 52% relative reduction. Extubation failure was more frequently observed in the control group compared with the protocol group (13% and 6%, respectively, p = .01). There was no significant difference in in-hospital mortality (38% vs. 45% in the protocol vs. control group, respectively, p = .22). Conclusions:In patients receiving mechanical ventilation and requiring sedative infusions with midazolam or propofol, the use of a nurse-implemented sedation protocol decreases the rate of VAP and the duration of mechanical ventilation.

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