Digoxin toxicity presenting as altered mental status in a patient with severe chronic obstructive lung disease.

Gastrointestinal and cardiac manifestations are the commonly considered features of digoxin toxicity. This report describes a patient with severe chronic obstructive lung disease whose primary manifestation of digoxin toxicity is acute alteration of mental status. Neurologic dysfunction may be the sole manifestation of digitalis toxicity. The diagnosis of digoxin toxicity should be considered in elderly patients with altered mental status, even when serum levels are within a therapeutic range.