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Am. J. Respir. Crit. Care Med., Volume 164, Number 2, July 2001, 231-236

Efficacy of Low Tidal Volume Ventilation in Patients with Different Clinical Risk Factors for Acute Lung Injury and the Acute Respiratory Distress Syndrome

MARK D. EISNER, TAYLOR THOMPSON, LEONARD D. HUDSON, JOHN M. LUCE, DOUGLAS HAYDEN, DAVID SCHOENFELD, MICHAEL A. MATTHAY, and the Acute Respiratory Distress Syndrome Network

Division of Pulmonary and Critical Care Medicine, and Division of Occupational and Environmental Medicine, Department of Medicine, University of California, San Francisco; Pulmonary and Critical Care Medicine, and ARDS Network Clinical Coordinating Center, Massachusetts General Hospital, Harvard University; Pulmonary and Critical Care Medicine, Harborview Medical Center, University of Washington; Department of Biostatistics, Harvard School of Public Health; Department of Anesthesia and Cardiovascular Research Institute, University of California, San Francisco

In patients with acute lung injury (ALI) and acute respiratory distress syndrome (ARDS), a recent ARDS Network randomized controlled trial demonstrated that a low tidal volume (VT) mechanical ventilation strategy (6 ml/kg) reduced mortality by 22% compared with traditional mechanical ventilation (12 ml/kg). In this study, we examined the relative efficacy of low VT mechanical ventilation among 902 patients with different clinical risk factors for ALI/ARDS who participated in ARDS Network randomized controlled trials. The clinical risk factor for ALI/ARDS was associated with substantial variation in mortality. The risk of death (before discharge home with unassisted breathing) was highest in patients with sepsis (43%); intermediate in subjects with pneumonia (36%), aspiration (37%), and other risk factors (35%); and lowest in those with trauma (11%) (p < 0.0001). Despite these differences in mortality, there was no evidence that the efficacy of the low VT strategy varied by clinical risk factor (p = 0.76, for interaction between ventilator group and risk factor). There was also no evidence of differential efficacy of low VT ventilation in the other study outcomes: proportion of patients achieving unassisted breathing (p = 0.59), ventilator-free days (p = 0.58), or development of nonpulmonary organ failure (p = 0.44). Controlling for demographic and clinical covariates did not appreciably affect these results. After reclassifying the clinical risk factors as pulmonary versus nonpulmonary predisposing conditions and infection-related versus non-infection-related conditions, there was still no evidence that the efficacy of low VT ventilation differed among clinical risk factor subgroups. In conclusion, we found no evidence that the efficacy of the low VT ventilation strategy differed among clinical risk factor subgroups for ALI/ARDS.

Keywords: acute respiratory distress syndrome; mechanical ventilators; acute lung injury




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