<prompt> All of the following decrease AV conduction acceptEsmololDigitalisLignocaineVerapamil  <response>: Refer kDT 6e p 495 Class IV agents are slow non-dihydropyridine calcium channel blockers. They decrease conductionthrough the AV node, and shoen phase two the plateau of the cardiac action potential. They thusreduce the contractility of the hea, so may be inappropriate in hea failure. Class 4 antiarrythmias are calcium channel blockers 