🩺 Diabetic Nephropathy is the most common cause of end-stage renal failure (ESRF) in the UK. It is defined by nodular diabetic glomerulosclerosis with thickened basement membranes, mesangial expansion, and the pathognomonic Kimmelstiel–Wilson lesion. 💡 Early detection + tight risk-factor control can dramatically slow progression.

🧾 About

A microvascular complication of both type 1 and type 2 diabetes.
Up to 60% of type 1 diabetics develop it after 30 years’ disease duration.
Earliest sign: Microalbuminuria (30–300 mg/24 hr).
Accelerated by hypertension and poor glycaemic control.

⚠️ Effects

Glomerular sclerosis → declining GFR 📉
Renal papillary necrosis 🔥
Progression to chronic kidney disease (CKD)
Recurrent UTIs 🦠
Diabetic arteriolar disease 🩸
Hyporeninaemic hypoaldosteronism → hyperkalaemia ⚡

🚩 Red Flags (think alternative diagnosis)

❌ Absence of diabetic retinopathy
❌ Persistent haematuria / red cell casts
❌ Renal impairment without proteinuria
❌ Rapid unexplained decline in renal function

Microalbuminuria: ACR >3 mg/mmol but negative dipstick. Overt nephropathy: ACR >30 mg/mmol.

🔍 Investigations

Urine ACR (early morning): • >3 mg/mmol → microalbuminuria • >30 mg/mmol → overt nephropathy
U&E + creatinine: calculate eGFR.
CKD diagnosis: eGFR <60 mL/min/1.73m² for ≥3 months OR persistent ACR >3 mg/mmol.

🧬 Pathology

Kimmelstiel–Wilson nodules 🌰
Nodular glomerulosclerosis
Thickened GBM
Mesangial expansion

📉 Natural History

Hyperfiltration (early) → Microalbuminuria
Overt proteinuria → Declining GFR
End-stage renal failure (ESRF)

💊 Management of CKD in Diabetes

📅 Annual screening: urine ACR + eGFR
🩸 BP target: <130/80 mmHg (ACEi/ARB first-line)
🧃 Glycaemic control: optimise HbA1c
💊 Lipid control: Atorvastatin 20 mg OD
🚭 Stop smoking
🔎 Refer nephrology if: • ACR >7 mg/mmol, OR • GFR decline >5 mL/min/1.73m²/year
🩺 Advanced disease → dialysis or renal ± pancreatic transplantation
📖 Patient education: sick-day rules (withhold ACEi/ARB, NSAIDs, metformin, diuretics during illness to prevent AKI)

💡 Clinical Pearls

🌟 Microalbuminuria precedes proteinuria – catch it early
👁 Always check for diabetic retinopathy → absence suggests alternative pathology
💊 ACEi/ARBs not only reduce BP but slow nephropathy progression

📚 References

NICE – Diabetic complications

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Diabetic nephropathy