<prompt> Digoxin toxicity is increased by all exceptHyperkalemiaHypercalcemiaHypomagnesemiaRenal impairment  <response>: PRECAUTIONS AND CONTRAINDICATIONS a Hypokalemia, hypomagnesemia, hypercalcaemia: enhances digitalis toxicity. b Elderly, renal or severe hepatic disease: patients are more susceptible to digoxin toxicity. c Myocardial ischaemia: severe arrhythmias are more likely. d Thyrotoxicosis: patients are more prone to develop digitalis arrhythmias. e Myxoedema: these patients eliminate digoxin more slowly; cumulative toxicity can occur. f Ventricular tachycardia: digitalis is contraindicated because it may precipitate ventricular fibrillation. g Paial A-V block: may be conveed to complete A-V block by digoxin. h Acute myocarditis: Diphtheria, acute rheumatic carditis, toxic carditis--inotropic response to digitalis is poor, more prone to arrhythmias. i Wolff-Parkinson-White syndrome: Digitalis is contraindicated because it decreases the ERP of bypass tract in 13 patients. In them rapid atrial impulses may be transmitted to ventricles - VF may occur. Digitalis can increase the chances of reentry by slowing conduction in the normal A-V bundle and accelerating it in the aberrant pathway. Ref:- kd tripathi; pg num:-516,517 