SummaryThe procaine amide given orally at the dose of 250 mgr every 10 minutes allowed in less than half an hour, to restore into sinusal rhythm a ventricular tachycardia which developed 50 hours earlier in a patient with Wolff-Parkinson- White syndrome.The procaine amide can be used successfully in ventricular supranodal arrhythmia and in recent auricular fibrillation. During a prolonged treatment, hematologic control must he systematic to avoid agranulocytosis seldom met, hut nevertheless reported in the literature.