TOPICS: Class IV antiarrhythmics, nondihydropyridine calcium channel blockers, heart, slope of phase 0, nodal ap, slope of phase 4, conduction velocity, sa node, av node, increased erp, increased pr, diltiazem, vasodilator, myocardium depressant, verapamil, supraventricular tachycardia, rate control, atrial fibrillation, constipation, flushing, edema, heart failure, av block, sinoatrial depression, headaches, systemic hypotension, sick sinus syndrome
