<prompt> Digitalis toxicity aggrevated by:HypokalemiaHyperkalemiaHypocalcemiaHypermagnesemia  <response>: Hypokalemia: Ref: 1375 -H1433-H17thDIGITALIS INTOXICATION: - Serious and potentially fatal complication Advanced age Renal insufficiency Acute MI Hypokalemia Hypomagnesemia Hypoxemia Hypercalcemia The most frequent disturbance of cardiac rhythm are ventricular premature beats, bigeminy, ventricular tachycardia and rarely ventricular fibrillation. AV block and nonparoxysmal atrial tachycardia with variable AV block are characteristic of digitalis intoxication. The Dose of digitalis should be reduced by half in Quinidine, veropamil, amiodarone and propafenone 