A 52-year-old man with essential hypertension and type 2 diabetes mellitus presents for antihypertensive therapy. He has mild proteinuria and a serum creatinine of 1.2 mg/dL. Which drug is the preferred first-line agent for this patient?

Question

Accepted Answer

A. Lisinopril. ## Rationale for ACE Inhibitor as First-Line

**Key Point:** ACE inhibitors are the preferred first-line antihypertensive in diabetic patients with evidence of renal involvement (proteinuria, elevated creatinine).

### Mechanism of Renoprotection
1. Dilate efferent arterioles of the glomerulus → reduce intraglomerular pressure
2. Reduce proteinuria independent of blood pressure lowering
3. Slow progression of diabetic nephropathy
4. Decrease aldosterone-mediated fibrosis

**High-Yield:** ACE inhibitors and ARBs are the ONLY antihypertensives with proven renoprotective effects in diabetic patients. They reduce proteinuria and slow GFR decline.

### Comparison with Other Options

| Agent | Mechanism | Renal Effect | Use in DM + Proteinuria |
|-------|-----------|--------------|------------------------|
| ACE inhibitor (Lisinopril) | Blocks angiotensin II formation | Renoprotective | **First-line** |
| ARB | Blocks AT1 receptor | Renoprotective | Alternative if ACE-I intolerant |
| Calcium channel blocker | Vasodilation | Neutral/reflex tachycardia | Second-line |
| Thiazide diuretic | Inhibits Na-Cl cotransporter | Worsens glucose control | Avoid in DM |
| Beta-blocker | β1 antagonism | Neutral/mask hypoglycemia | Not preferred |

**Clinical Pearl:** The presence of proteinuria in a diabetic patient is a **red flag** for progressive nephropathy. ACE inhibitors are indicated regardless of blood pressure level in this scenario.

**Mnemonic:** **RAAS** = Renin-Angiotensin-Aldosterone System — ACE inhibitors block this system, providing dual benefit: BP reduction + renal protection.

[cite:KD Tripathi 8e Ch 31]

Answer

B. Amlodipine

Answer

C. Hydrochlorothiazide

Answer

D. Labetalol

A 52-year-old man with essential hypertension and type 2 diabetes mellitus presents for antihypertensive therapy. He has mild proteinuria and a serum creatinine of 1.2 mg/dL. Which drug is the preferred first-line agent for this patient?

Explanation

Rationale for ACE Inhibitor as First-Line

Mechanism of Renoprotection

Comparison with Other Options

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Agent	Mechanism	Renal Effect	Use in DM + Proteinuria
ACE inhibitor (Lisinopril)	Blocks angiotensin II formation	Renoprotective	First-line
ARB	Blocks AT1 receptor	Renoprotective	Alternative if ACE-I intolerant
Calcium channel blocker	Vasodilation	Neutral/reflex tachycardia	Second-line
Thiazide diuretic	Inhibits Na-Cl cotransporter	Worsens glucose control	Avoid in DM
Beta-blocker	β1 antagonism	Neutral/mask hypoglycemia	Not preferred