Question:
A 52-year-old male with type 2 diabetes mellitus presents with hypertension and proteinuria. His serum creatinine is 1.4 mg/dL and estimated GFR is 65 mL/min/1.73 m$^2$. Which of the following classes of drugs is most appropriate for renal protection in this patient?
A 52-year-old male with type 2 diabetes mellitus presents with hypertension and proteinuria. His serum creatinine is 1.4 mg/dL and estimated GFR is 65 mL/min/1.73 m$^2$. Which of the following classes of drugs is most appropriate for renal protection in this patient?
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ACE inhibitors and ARBs provide renoprotection by dilating the efferent arteriole, reducing intraglomerular pressure, and lowering proteinuria.
Always monitor serum potassium and creatinine within 1-2 weeks of initiating RAAS blockade, as they can cause mild expected rises in creatinine and hyperkalemia.
Always monitor serum potassium and creatinine within 1-2 weeks of initiating RAAS blockade, as they can cause mild expected rises in creatinine and hyperkalemia.
Updated On: Sep 3, 2026
- ARB
- Calcium channel blocker
- Thiazide diuretic
- Beta-blocker
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The Correct Option is A
Solution and Explanation
Concept:
The patient has type 2 diabetes mellitus, hypertension, and evidence of diabetic kidney disease indicated by proteinuria.
The goal is to select an antihypertensive agent that provides the best renoprotection (slowing the progression of chronic kidney disease) independent of just lowering systemic blood pressure.
Explanation:
• In patients with diabetic nephropathy characterized by hypertension and proteinuria, Angiotensin-Converting Enzyme inhibitors (ACEi) or Angiotensin II Receptor Blockers (ARBs) are the standard first-line therapies.
• Diabetic nephropathy often features hyperfiltration mediated by preferential constriction of the efferent arteriole, driven largely by Angiotensin II.
• By blocking the renin-angiotensin-aldosterone system (RAAS), ARBs (like Losartan or Valsartan) cause efferent arteriolar vasodilation.
• This vasodilation significantly reduces intraglomerular capillary hydrostatic pressure, which in turn decreases the mechanical stress on the glomerular filtration barrier.
• Consequently, ARBs directly reduce proteinuria and slow the rate of glomerulosclerosis and nephron loss over time.
• Calcium channel blockers (CCBs), particularly dihydropyridines like amlodipine, are effective at lowering systemic blood pressure but typically cause afferent arteriolar vasodilation, which may not adequately relieve intraglomerular pressure and can sometimes worsen proteinuria if used without RAAS blockade.
• Thiazide diuretics are good adjunctive antihypertensive agents but lack the specific intrarenal hemodynamic benefits seen with RAAS blockade.
• Beta-blockers similarly lower systemic blood pressure but do not offer targeted renoprotection against diabetic proteinuria.
Final answer:
An Angiotensin II Receptor Blocker (ARB) is the most appropriate class of drug for targeted renal protection in this clinical scenario.
The patient has type 2 diabetes mellitus, hypertension, and evidence of diabetic kidney disease indicated by proteinuria.
The goal is to select an antihypertensive agent that provides the best renoprotection (slowing the progression of chronic kidney disease) independent of just lowering systemic blood pressure.
Explanation:
• In patients with diabetic nephropathy characterized by hypertension and proteinuria, Angiotensin-Converting Enzyme inhibitors (ACEi) or Angiotensin II Receptor Blockers (ARBs) are the standard first-line therapies.
• Diabetic nephropathy often features hyperfiltration mediated by preferential constriction of the efferent arteriole, driven largely by Angiotensin II.
• By blocking the renin-angiotensin-aldosterone system (RAAS), ARBs (like Losartan or Valsartan) cause efferent arteriolar vasodilation.
• This vasodilation significantly reduces intraglomerular capillary hydrostatic pressure, which in turn decreases the mechanical stress on the glomerular filtration barrier.
• Consequently, ARBs directly reduce proteinuria and slow the rate of glomerulosclerosis and nephron loss over time.
• Calcium channel blockers (CCBs), particularly dihydropyridines like amlodipine, are effective at lowering systemic blood pressure but typically cause afferent arteriolar vasodilation, which may not adequately relieve intraglomerular pressure and can sometimes worsen proteinuria if used without RAAS blockade.
• Thiazide diuretics are good adjunctive antihypertensive agents but lack the specific intrarenal hemodynamic benefits seen with RAAS blockade.
• Beta-blockers similarly lower systemic blood pressure but do not offer targeted renoprotection against diabetic proteinuria.
Final answer:
An Angiotensin II Receptor Blocker (ARB) is the most appropriate class of drug for targeted renal protection in this clinical scenario.
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