 11. Current use of potassium-sparing agents, such as potassium-sparing diuretics e.g., spironolactone, ACE inhibitors, angiotensin-II receptor antagonists, heparin, aldosterone antagonists, NSAIDS, potassium sparing diuretics or potassium-supplements because of risk of developing arrhythmia with two potassium-elevating agents. 