Management of CKD Stage 3a with Renal Artery Stenosis and Proteinuria

Initial Medical Management

The American College of Cardiology recommends starting an ACE inhibitor or ARB as first-line therapy to address both proteinuria and hypertension in patients with CKD stage 3a, with a target systolic blood pressure of <130/80 mmHg 1, 2
The Kidney Disease: Improving Global Outcomes (KDIGO) guideline suggests monitoring serum creatinine and potassium within 2-4 weeks after initiation or dose increase of ACE inhibitor or ARB, and continuing therapy unless serum creatinine rises by more than 30% within 4 weeks of initiation or dose increase 2

Closely monitor renal function after initiating therapy to ensure that the renal artery stenosis does not lead to acute kidney injury with RAAS blockade, as recommended by the European Society of Cardiology 1, 3

The American Heart Association recommends adding a diuretic if needed for blood pressure control or volume management, and implementing dietary sodium restriction to <2.0 g/d to enhance the antiproteinuric effect of ACE inhibitors or ARBs 1, 4
Consider statin therapy, especially if the patient has other cardiovascular risk factors, as suggested by the National Lipid Association 5, 2

Monitor proteinuria regularly to assess response to therapy, and assess for hyperkalemia, which can occur with ACE inhibitors or ARBs, especially in patients with reduced GFR, as recommended by the International Society of Nephrology 1, 6
Consider using potassium-wasting diuretics if hyperkalemia develops to allow continued use of RAAS blocking medications, as suggested by the European Renal Association 1, 6

Avoid dual RAAS blockade (combining ACE inhibitor and ARB) as this increases adverse events without providing additional benefits in most patients, as recommended by the American College of Physicians 2
Be cautious with aggressive blood pressure lowering in patients with significant renal artery stenosis, as it may lead to acute kidney injury, as suggested by the European Society of Hypertension 4