<prompt> Which of the following is not a contraindication for use of digitalis -Acute rheumatic carditisThyrotoxicosisWPW syndromeHyperkalemia  <response>: Ans. is d i.e., Hyperkalemia Precaution should be taken in following conditions enhance digitalis toxicity, o Hypokalemia o Advanced age o Myxoedema o Hypomagnesemia o Hypoxia o Thyrotoxicosis o Hypercalcemia o Renal insufficiency o Acute MI o Acute myocarditis as in rheumatic carditis Note: o Option a b are not contraindications. But, they enhance digitalis toxicity, so may be considered as relative contraindications. 