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This Concept Map, created with IHMC CmapTools, has information related to: Class III, class III Type Bretylium (bretylol), class III Type Ibutilide (covert), class III Type IV nitroglycerin, class III uses Used for life threatening ventricular arrhythmias when class I-b & I-c not effective, class III action Decreases automaticity Delays repolarization Increases duration of action potential prolonged PR & QT intervals Widened QRS, class III Type amiodarone (cardarone), class III Type Dofetilide (tikosyn), class III S/E orthostatic hypotension, dizziness photosensitivity