<prompt> Lignocaine is useful for the treatment of :Atrial fibrillationParoxysmal supraventricular tachycardiaDigitalis induced ventricular extrasystolesAll of the above  <response>: Ref: KDT 6e p502 Lignocaine is used only for the treatment of ventricular arrhythmias, it has no role in atrial arrhythmia. 