Recent data show that mortality from adult respiratory distress syndrome has declined over the years yet these patients continue to be a challenge for physicians. Mechanical ventilatory support is required to maintain oxygenation and support respiratory workload. However, experimental data, largely from animal studies, have shown that lung injury can be induced by mechanical ventilation and positive pressure ventilation may worsen the hemodynamic status of an already unstable patient. Some ventilatory strategies may be more deleterious than others. Using the evidence from experimental and clinical studies, a "lung protective" strategy of mechanical ventilation has been proposed combining low tidal volumes to limit stretch and adequate levels of positive end-expiratory pressure to prevent alveolar collapse. This strategy may also limit end organ damage and promote hemodynamic stability. Clin Pulm Med 2003;10(3):154-161
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