Heparin causes hyperkalemia primarily by impairing renal potassium excretion. The key mechanism is heparin-induced suppression of aldosterone synthesis. Aldosterone, a mineralocorticoid hormone produced by the adrenal zona glomerulosa, enhances potassium secretion in the distal nephron of the kidney. Heparin and its derivatives (including unfractionated heparin and low-molecular-weight heparin) inhibit aldosterone production through several pathways:
Several clinical observations and studies have suggested an association between heparin therapy and the development of hyperkalemia: heparin cause hyperkalemia
Heparin, particularly at high doses or with prolonged use, can inhibit the production of aldosterone, a hormone produced by the adrenal glands that plays a critical role in regulating sodium and potassium balance in the blood. Lower levels of aldosterone can lead to reduced potassium excretion in the urine, contributing to hyperkalemia. can inhibit the production of aldosterone