<prompt> All are true regarding antiarrhythmic, EXCEPT :Verapamil belongs to second group drugsContraindicated in Sick sinus syndromeIt is contraindicated in complete heart block.It depresses heart rate  <response>: Ans. is a i.e. Verapamil belongs to second group drugs Verapamil is a calcium channel blocker. It belongs to class IV anti-arrhythmic drugs. Electrophysiological properties of verapamil. Among the Ca2 channel blockers, verapamil has the most prominent cardiac electrophysiological action. It is a cardio depressant drug. Specific effects of verapamil. 1. S.A. nodal atomicity - decrease 2. Ventricular atomicity - decrease 3. A-V nodal ERP - increase 4. PR interval - increase Verapamil A. Uses as Antiarrhythmic PSVT - Preferred for PSVT. The drug of choice for PSVT is Adenosine Control ventricular rate in AF or AFI. B. Contraindications 1 Partial heart block 2 Sick sinus 3 Ventricular arrhythmia ppt-VF 4 Digitalis toxicity Additive A-V block 