An adult patient has two office visits with blood pressures of 150/95 mmHg and 148/90 mmHg, and ambulatory reading of 145/92 mmHg. All diagnostic tests are normal. Which treatment is most appropriate to initiate?

• A. A thiazide diuretic
• B. A beta-blocker
• C. A loop diuretic
• D. A calcium channel blocker

Answer: (A)

When managing uncomplicated essential hypertension, a thiazide diuretic is the most appropriate first-line starting therapy. These agents have robust evidence showing they reduce major cardiovascular events and are cost-effective, well tolerated in many patients, and reliably lower blood pressure with once-daily dosing. In a patient with persistently elevated blood pressure across multiple visits and a normal workup, there are no compelling indications for a beta-blocker, loop diuretic, or calcium channel blocker that would trump starting a thiazide.

Beta-blockers are generally reserved for compelling indications such as coronary artery disease, arrhythmias, or heart failure, and they’re not the preferred initial choice for uncomplicated hypertension. Loop diuretics are powerful diuretics that are excellent for edema or volume overload (and certain kidney diseases) but they don’t offer the same long-term cardiovascular risk reduction seen with thiazides in primary hypertension. Calcium channel blockers are effective and can be used as first-line in some patients, but thiazides have the broadest support for initial management of uncomplicated HTN due to strong outcome data and cost considerations.

Starting a thiazide now, with plans to monitor blood pressure and electrolytes, aligns with best practice for initial therapy in this scenario.