Accidental quinidine poisoning in two children.

Two cases of acute accidental quinidine poisioning in two children are presented. Both cases are characterized by the same ECG abnormalities consisting of rhythm disorders and AV and intraventricular conduction defects. It is suggested that there is a causal relationship between the electrophysiologic cardiac effects of quinidine and the ECG abnormalities observed. Both patients were successfully treated by continuous intravenous infusion of a hypertonic sodium chloride solution and lidocaine.