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This Concept Map, created with IHMC CmapTools, has information related to: Class IV, class IV action Decreases contractility Prolonged conduction time in AV node Prolonged PR interval, class IV S/E severe orthostatic hypotension, worsening CHF, flushing, leg & muscle cramps, HA, Can precipitate MI hepatotoxicity pulmonary toxicity, class IV uses stops/controls atrial dysrhythmias & PSVTs, class IV Type Verapamil (calan), class IV Type Diltiazem (cardizem)