Critical Care Medicine

Adult Critical Care

Efficacy of ventilator waveforms observation in detecting patient–ventilator asynchrony

Colombo D, Cammarota G, Alemani M, et al (Universitá del Piemonte Orientale “Amedeo Avogadro,” Novara, Vercelli, Italy; et al) Crit Care Med 39:2452-2457, 2011^§

Abstract

Objectives

The value of visual inspection of ventilator waveforms in detecting patient–ventilator asynchronies in the intensive care unit has never been systematically evaluated. This study aims to assess intensive care unit physicians’ ability to identify patient–ventilator asynchronies through ventilator waveforms.

Design

Prospective observational study.

Setting

Intensive care unit of a University Hospital.

Patients

Twenty-four patients receiving mechanical ventilation for acute respiratory failure.

Intervention

Forty-three 5-min reports displaying flow-time and airway pressure-time tracings were evaluated by 10 expert and 10 nonexpert, i.e., residents, intensive care unit physicians. The asynchronies identified by experts and nonexperts were compared with those ascertained by three independent examiners who evaluated the same reports displaying, additionally, tracings of diaphragm electrical activity.

Measurements and Main Results

Data were examined according to both breath-by-breath analysis and overall report analysis. Sensitivity, specificity, and positive and negative predictive values were determined. Sensitivity and positive predictive value were very low with breath-by-breath analysis (22% and 32%, respectively) and fairly increased with report analysis (55% and 44%, respectively). Conversely, specificity and negative predictive value were high with breath-by-breath analysis (91% and 86%, respectively) and slightly lower with report analysis (76% and 82%, respectively). Sensitivity was significantly higher for experts than for nonexperts for breath-by-breath analysis (28% vs. 16%, p < .05), but not for report analysis (63% vs. 46%, p = .15). The prevalence of asynchronies increased at higher ventilator assistance and tidal volumes (p < .001 for both), whereas it decreased at higher respiratory rates and diaphragm electrical activity (p < .001 for both). At higher prevalence, sensitivity decreased significantly (p < .001).

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