Digitalis intoxication and treatment with digoxin antibody fragments in renal failure.

Severe digitalis intoxication today is preferentially treated by intravenous infusion of Fab fragments of digoxin antibodies (Digitalis Antidot BM). The kinetics of Fab fragments in the circulation are well known when kidney function is normal or slightly impaired. There are no data available, however, in complete renal failure. We observed a patient with life-threatening digitalis intoxication (serum digoxin, 3.7 ng/ml) and anuria, who was treated successfully by 160 mg Fab fragments i.v. Serum digoxin and Fab fragment concentrations could be followed for 229 h. The extrarenal clearance of Fab fragments was lower (5.6 ml/min) than in patients with normal kidney function (10.9 ml/min). This finding suggests that lower doses than usual might be sufficient for treating patients with severe digitalis intoxication and renal failure.