Resistant Hypertension Management

Diagnosis and Confirmation

The American Heart Association defines resistant hypertension as blood pressure that remains above target (>130/80 mmHg) despite concurrent use of at least three antihypertensive agents, including a long-acting calcium channel blocker, a blocker of the renin-angiotensin system, and a diuretic at maximal or maximally tolerated doses 1
Exclude pseudoresistance by performing 24-hour ambulatory BP monitoring to confirm adherence and exclude white-coat effect 1
Assess for secondary causes of hypertension, particularly primary aldosteronism, obstructive sleep apnea, renal artery stenosis, and other endocrine disorders 2

Implement dietary salt restriction to less than 2400 mg/day, which can reduce systolic and diastolic blood pressure by 5-10 mmHg and 2-6 mmHg respectively 3, 4
Encourage weight loss for overweight or obese patients, as a 10-kg weight loss is associated with average reductions of 6.0 mmHg systolic and 4.6 mmHg diastolic blood pressure 5, 3
Recommend the DASH diet (rich in fruits, vegetables, low-fat dairy, and low in saturated fats), which can reduce systolic and diastolic blood pressure by 11.4 and 5.5 mmHg respectively 5, 2
Limit alcohol intake to no more than 2 drinks per day for men and 1 drink per day for women 5, 4
Promote regular aerobic exercise for at least 30 minutes on most days of the week, which can reduce blood pressure by approximately 4/3 mmHg 5

Ensure patients are on optimal doses of a three-drug regimen including a long-acting calcium channel blocker, a renin-angiotensin system blocker, and an appropriately dosed diuretic based on kidney function 1, 2
Substitute a thiazide-like diuretic (chlorthalidone or indapamide) for hydrochlorothiazide, as these have superior 24-hour blood pressure control 1, 6
Simplify medication regimen using long-acting combination products when possible to improve adherence 4, 7

Add a mineralocorticoid receptor antagonist (MRA) as the most effective fourth-line agent, with spironolactone being the preferred option (start at 25 mg daily) 1
If not tolerated, use eplerenone as an alternative 1, 7

For patients with obstructive sleep apnea, CPAP therapy can significantly improve blood pressure control 5, 2
African American patients may respond better to calcium channel blockers and diuretics than to renin-angiotensin system blockers 7
Avoid medications that can interfere with blood pressure control, such as NSAIDs, certain antidepressants, and stimulants 7, 6

Volume overload due to insufficient diuretic therapy is a common cause of treatment failure; ensure appropriate diuretic dosing 2, 7
Poor medication adherence accounts for approximately 50% of apparent treatment resistance; consider pill counts, medication diaries, or directly observed therapy 7
White coat hypertension may be misdiagnosed as resistant hypertension; always confirm with out-of-office measurements 1
Device-based therapies like renal denervation remain investigational and should be considered only after optimizing pharmacological therapy 1