Potassium and magnesium depletions in congestive heart failure--pathophysiology, consequences and replenishment

Clin Calcium. 2005 Nov;15(11):123-33.

Abstract

Congestive heart failure (CHF) is becoming more frequent worldwide. Both potassium (K) and magnesium (Mg) deficiencies are common and can be associated with risk factors and complications of heart failure (HF). The major causes of K and Mg depletions are the effects of compensatory neuroendocrine mechanisms (activation of the renin-angiotensin-aldosterone and sympathoadrenergic systems), digoxin therapy, and administration of thiazide or loop diuretic therapy in CHF. Particular attention should be paid to K and Mg restoration in CHF, because of the consequences of both deficiencies (increased arrhythmic risk, vasoconstriction), and the co-supplementation of both ions is necessary in order to achieve K repletion. Mg and K should be employed as first-line therapy in digitalis intoxication and drug-related arrhythmias, and should be considered an important adjuvant therapy in diuretic treated patients with CHF. Another possibility to restore normal K and Mg status is usage of a K, Mg sparing diuretics.

Publication types

  • Review

MeSH terms

  • Diuretics / adverse effects
  • Heart Failure / drug therapy*
  • Humans
  • Magnesium / therapeutic use
  • Magnesium Deficiency / complications*
  • Magnesium Deficiency / drug therapy
  • Magnesium Deficiency / physiopathology
  • Potassium / therapeutic use
  • Potassium Deficiency / complications*
  • Potassium Deficiency / drug therapy
  • Potassium Deficiency / physiopathology

Substances

  • Diuretics
  • Magnesium
  • Potassium