Hypertensive Nephropathy

Our Approach in Managing Hypertensive Nephropathy

Hypertensive nephropathy does not have a dramatic presentation. It is identified on a blood test showing a modestly elevated creatinine, or on a urine dipstick showing protein, in a patient who has had hypertension for years. The challenge is that by the time these numbers appear, structural damage has already occurred. Our blood pressure-related kidney damage specialist team in Mumbai, India focuses on stopping further damage and managing the complications of what has already occurred.

1. Establishing the Diagnosis

• Hypertensive nephropathy is a diagnosis of exclusion - other causes of CKD must be ruled out first
• History of long-standing hypertension (typically >5 years) preceding kidney dysfunction
• Urinalysis - mild to moderate proteinuria (usually <1g/day), with or without microscopic haematuria
• eGFR reduction proportional to hypertension duration and BP control quality
• Renal ultrasound - bilaterally small, echogenic kidneys in advanced nephrosclerosis
• Kidney biopsy - considered when proteinuria is heavy, clinical picture is atypical, or rapid progression needs explanation

2. Blood Pressure Management - The Primary Intervention

BP control for kidney protection is not just a recommendation in hypertensive nephropathy - it is the treatment.

• Target BP: <130/80 mmHg in all CKD patients; <125/75 mmHg if proteinuria >1g/day
• ACE inhibitors or ARBs - first-line; dual renoprotective and antihypertensive effect
• Thiazide diuretics - effective in early CKD; switch to loop diuretics when eGFR <30
• Calcium channel blockers (amlodipine) - effective BP lowering; dihydropyridine CCBs preferred; non-dihydropyridine CCBs reduce proteinuria as adjunct to ACE inhibitor
• Beta-blockers - useful add-on particularly where cardiac indication exists
• Resistant hypertension: mineralocorticoid receptor antagonists, centrally acting agents, or specialist referral for secondary hypertension workup

3. Identifying & Treating Secondary Hypertension

A proportion of patients labelled as hypertensive nephropathy have secondary hypertension driving both the BP and the kidney damage - and missing this misses the cure.

• Renovascular hypertension - renal artery stenosis; doppler ultrasound, CT angiography
• Primary hyperaldosteronism - aldosterone-to-renin ratio screening in resistant or hypokalaemic hypertension
• Obstructive sleep apnoea - nocturnal hypertension pattern; often undiagnosed and undertreated
• Phaeochromocytoma - rare but critical to exclude in episodic severe hypertension

4. Proteinuria Management

Even in the context of hypertension-related kidney disease, proteinuria independently drives progression.

• High blood pressure and kidney function decline are both worsened by uncontrolled proteinuria
• RAAS blockade reduces proteinuria independently of BP lowering - use even when BP appears controlled
• SGLT2 inhibitors - increasingly used in hypertensive CKD with proteinuria regardless of diabetic status
• 24-hour urine protein or UACR - monitored at every follow-up visit as a treatment response marker

5. Managing CKD Complications in Hypertensive Nephropathy

• Anaemia - as eGFR falls, erythropoietin production falls; ESAs and IV iron when indicated
• Mineral bone disease - phosphate binders, active Vitamin D, Cinacalcet where PTH is elevated
• Electrolyte monitoring - sodium, potassium, bicarbonate - with dietary guidance and pharmacological correction
• Volume management - diuretic optimisation to prevent both fluid overload and excessive volume depletion

6. Cardiovascular Risk - The Parallel Priority

Hypertensive nephropathy patients carry extremely high cardiovascular risk - hypertension, CKD, and proteinuria each independently increase cardiac events.

• Statin therapy universally recommended
• Aspirin in secondary cardiovascular prevention
• Smoking cessation - smoking raises both BP and progression rate of nephrosclerosis
• Regular cardiac evaluation - ECG, echocardiography for LVH assessment.