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Orthodeoxia in amiodarone-induced acute reversible pulmonary damage.

A case of acute reversible pulmonary damage from amiodarone is described. Pulmonary infiltrates had a basal predominance. The histopathologic picture was that of acute alveolitis. Orthodeoxia was evident on blood gas analysis; the PaO2 was 73 mm Hg on recumbency, and the PaO2 was 57 mm Hg in the upright position. Partial arterial resaturation was evident on exercise (PaO2, 64 mm Hg).