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What is Beta blockers are antiarrhythmic agents of class and explain in detail?
Refer kDT 6/e p 511 The five main classes in the Vaughan Williams classification of antiarrhythmic agents are: Class I agents interfere with the sodium (Na+) channel. Class II agents are anti-sympathetic nervous system agents. ... Class III agents affect potassium (K+) efflux. Class IV agents affect calcium channels and the AV node.