علاقة ارتفاع التوتر الشرياني باضطراب الوظيفة الكلويّة

The relationship is bidirectional: hypertension can cause and accelerate chronic kidney disease (CKD), while impaired kidney function can cause or worsen hypertension, creating a self-perpetuating cycle NICE CKS NICE CKS Su YJ 2026.

• Hypertension → kidney damage: sustained high blood pressure damages the renal microvasculature, causing arteriolar thickening, glomerulosclerosis and progressive nephron loss; uncontrolled hypertension therefore accelerates renal function decline NICE CKS Su YJ 2026.
• Kidney dysfunction → hypertension: reduced sodium and water excretion causes volume expansion, while activation of the renin–angiotensin–aldosterone system and sympathetic nervous system increases vasoconstriction and sodium retention Su YJ 2026. Renal disorders are the most common cause of secondary hypertension, including CKD, glomerulonephritis, diabetic nephropathy and polycystic kidney disease NICE CKS.
• Clinical consequences: worsening kidney dysfunction can make blood pressure increasingly difficult to control, and hypertension further increases renal and cardiovascular risk NICE CKS Su YJ 2026. Acute severe hypertension can also precipitate acute kidney injury by overwhelming renal autoregulation and injuring glomerular capillaries Su YJ 2026.

Implications in primary care

• Assess both filtration and kidney damage: investigate suspected CKD with serum creatinine/eGFR, early-morning urine albumin:creatinine ratio (ACR), and urine dipstick for haematuria NICE CKS. CKD requires persistent abnormalities for at least 3 months, rather than an isolated low eGFR, and is classified using both eGFR and ACR NICE CKS.
• Control blood pressure to interrupt the cycle: effective treatment helps slow CKD progression and reduces cardiovascular risk NICE CKS Su YJ 2026. ACE inhibitors or ARBs can additionally reduce intraglomerular pressure and proteinuria in albuminuric kidney disease Su YJ 2026. Do not combine an ACE inhibitor with an ARB in diabetic nephropathy because dual blockade increases hyperkalaemia, acute kidney injury and hypotension without demonstrated additional outcome benefit SmPC Irbesartan.
• Consider an underlying renal cause: resistant hypertension, particularly with peripheral vascular disease or an abdominal bruit, should raise suspicion of renal artery stenosis NICE CKS. Seek nephrology assessment for CKD with uncontrolled hypertension, accelerated progression or suspected renal artery stenosis NICE CKS.