Respiratory complications of overdose with sedative drugs.

The records of 195 patients admitted to an intensive care unit with a diagnosis of sedative drug overdose were reviewed with special reference to respiratory complications. Endotracheal intubation with mechanical ventilation was required in 150 patients (77 per cent). Complications associated with mortality included difficult or traumatic intubation (P less than 0.001), initial hypotension (P less than 0.001), alveolar hypoventilation (P less than 0.02), and the presence of chest roentgenographic infiltrates (P less than 0.01). Infiltrates appeared on the chest roentgenograms of 72 patients (37 per cent) and were related to hypotension (P less than 0.05) and evidence of gastric aspiration (P less than 0.001). Eight of 9 deaths were due to progressive respiratory insufficiency, and bacterial pneumonia was documented at autopsy in 4 of 7 cases. High serum drug concentrations and the presence of shock or gastric aspiration on admission characterized the 9 patients (4.6 per cent) who died.