Non-diuretic-based antihypertensive therapy and potassium homeostasis in elderly patients.

Aging and hypertension are associated with a progressive decline in renal blood flow and renal function. As a result, physicians planning therapeutic strategies to control blood pressure need to consider these changes and how they relate to potassium homeostasis, particularly in elderly patients. Commonly used antihypertensive drugs such as beta-blockers, angiotensin converting enzyme inhibitors and potassium-sparing diuretics need to be used with increasing caution in patients with declining renal function. This is especially important in patients with diabetes who may also have type IV renal tubular acidosis, and in patients given concomitant therapy with non-steroidal anti-inflammatory drugs. Other therapies such as calcium channel blockers, particularly those that gate atrioventricular nodal conduction, also need to be used with care in people with significant renal insufficiency and hyperkalemia, as this clinical scenario may result in a greater risk of complete heart block.