Hypokalemia with Hypertension Causes and Management

Primary Aldosteronism

Primary aldosteronism is the most common cause of hypokalemia with hypertension, occurring in up to 20% of patients with resistant hypertension and in 28.1% of all hypertensive patients with hypokalemia, according to the American Heart Association 1
The American College of Cardiology defines primary aldosteronism as a group of disorders characterized by inappropriately high aldosterone production that is relatively autonomous from the major regulators of secretion (angiotensin II and potassium) and cannot be suppressed with sodium loading 1, 2
Increased aldosterone production leads to hypertension, cardiovascular damage, and kidney damage, with key characteristics including sodium retention and suppressed plasma renin activity 1
The prevalence of hypokalemia in primary aldosteronism increases with decreasing potassium levels, with approximately 50% of cases due to unilateral aldosterone production (usually aldosterone-producing adenoma) and 50% due to bilateral adrenal hyperplasia (idiopathic hyperaldosteronism) 1, 2

Diuretics (especially thiazide and loop diuretics) can cause hypokalemia in hypertensive patients, as reported by the European Society of Cardiology 3, 4
Systemic corticosteroids can also cause hypokalemia, according to the American College of Cardiology 2
Cushing's syndrome, congenital adrenal hyperplasia, and other mineralocorticoid excess syndromes are other endocrine disorders that can cause hypokalemia with hypertension, as stated by the American Heart Association 5
Renovascular hypertension (renal artery stenosis) can cause a high renin state, leading to hypokalemia, as reported by the American Journal of Kidney Diseases 1, 8

The American College of Cardiology recommends screening for primary aldosteronism in patients with resistant hypertension, hypokalemia (spontaneous or substantial if diuretic-induced), incidentally discovered adrenal mass, family history of early-onset hypertension, and stroke at a young age (<40 years) 1, 2
The plasma aldosterone-to-renin ratio (ARR) is the recommended initial screening test, with a cutoff of 30 (when plasma aldosterone is reported in ng/dL and plasma renin activity in ng/mL/h), and plasma aldosterone concentration should be at least 10 ng/dL to interpret the test as positive, as stated by the American College of Cardiology 1, 2
Patients with positive screening should be referred to a hypertension specialist or endocrinologist for further evaluation and treatment, according to the American Heart Association 1, 2

The American College of Cardiology recommends laparoscopic adrenalectomy for primary aldosteronism due to unilateral disease, and mineralocorticoid receptor antagonists (spironolactone or eplerenone) for bilateral disease 2
Medication adjustment should be considered for medication-induced hypokalemia, as reported by the American Heart Association 1
Medical therapy is recommended for atherosclerotic renal artery stenosis, according to the American Journal of Kidney Diseases 8