Digoxin-specific antibody fragments for the treatment of suspected toxicosis in a cat.

Case Summary: A 6-year-old castrated male domestic shorthair cat presented for lethargy and gastrointestinal signs after possible exposure to leaves. The cat developed a ventricular arrhythmia that responded positively to the administration of digoxin-specific antibody fragments. Underlying hypertrophic cardiomyopathy was also diagnosed after the development of congestive heart failure.