Acute supine respiratory failure due to bilateral diaphragmatic paralysis.

This report documents the first known case of bilateral diaphragmatic paralysis following blunt trauma to the chest. The important role of diaphragmatic function in maintaining ventilation, particularly with the patient in the supine position, is illustrated by the reduced total lung capacity, functional residual capacity, and vital capacity. Severe hypoxemia with the patient in the supine position, was markedly improved by elevation of the patient to 30 degree and was further improved by sitting the patient upright. Following an initial period of acute respiratory failure, the patient was managed acceptably by maintaining an elevated position for sleeping until diaphragmatic function returned, about nine months after the injury.