All are true regarding antiarrhythmic, EXCEPT :
Verapamil belongs to second group drugs
Contraindicated in Sick sinus syndrome
It is contraindicated in complete heart block.
It depresses heart rate
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)*