This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
All are true regarding antiarrhythmic, EXCEPT : 
Select and explain. 
A. Verapamil belongs to second group drugs, B. Contraindicated in Sick sinus syndrome, C. It is contraindicated in complete heart block., D. It depresses heart rate
A: Verapamil belongs to second group drugs
Answer: A: Verapamil belongs to second group drugs 
Explanation: 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)*