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| group1 = [[Antiarrhythmic agent#Class I agents|class I]]<BR>([[sodium channel blocker|Na⁺ channe | group3 = [[Antiarrhythmic agent#Class III agents|class III]]<BR>([[Cardiac action potential#Phase 3|Phase 3

...lus&db=pubmed&cmd=Retrieve&dopt=abstractplus&list_uids=1474169 Classifying antiarrhythmic actions: by facts or speculation. Vaughan Williams EM, J Clin Pharmacol. 1 ...III">[http://circ.ahajournals.org/cgi/content/abstract/81/2/686 Class III antiarrhythmic agents have a lot of potential but a long way to go. Reduced effectiveness