Management of Resistant Hypertension After Discontinuing Losartan

Rationale for Calcium Channel Blocker Selection

• The American College of Cardiology recommends replacing losartan with a dihydropyridine calcium channel blocker (DHP-CCB) such as amlodipine 5-10 mg daily for a Black male with resistant hypertension, as this population responds particularly well to calcium channel blockers and diuretics as first-line therapy 1, 2, 3
• The American Heart Association suggests that Black patients respond better to DHP-CCBs, making them a primary recommended agent in this population, with amlodipine being a preferred option due to its once-daily dosing and proven cardiovascular outcomes 2, 3
• Adding a DHP-CCB to the existing regimen of furosemide and carvedilol creates a complementary three-drug regimen targeting different mechanisms, which is recommended by the American College of Cardiology 1, 4

Medication Recommendations

• The American College of Cardiology recommends starting amlodipine 5 mg daily, which can be titrated to 10 mg if needed for blood pressure control, with monitoring for dose-related pedal edema 1, 5, 6
• Amlodipine is safe to use with carvedilol, unlike non-DHP CCBs which increase bradycardia risk with beta blockers, as stated by the American Heart Association 1, 8

Alternative Options

• Nifedipine LA 30-90 mg daily can be considered as an alternative DHP-CCB option if amlodipine causes significant edema, according to the American College of Cardiology 1, 6
• Felodipine 2.5-10 mg daily is another once-daily alternative DHP-CCB option, as recommended by the American Heart Association 1, 5

Critical Monitoring Considerations

• The American College of Cardiology advises avoiding non-dihydropyridine CCBs (diltiazem, verapamil) as they should not be used routinely with beta blockers due to increased risk of bradycardia and heart block 1, 4, 8
• The American Heart Association recommends monitoring renal function and potassium levels, especially since the patient was on an ARB, to prevent potential adverse effects 1, 9

Resistant Hypertension Management

• If blood pressure remains uncontrolled, the American College of Cardiology suggests adding or optimizing thiazide-like diuretic therapy (chlorthalidone 12.5-25 mg daily preferred over hydrochlorothiazide) in addition to the loop diuretic if volume overload is present 1, 4, 7
• The American Heart Association recommends considering spironolactone 25-50 mg daily as this is the preferred add-on agent for resistant hypertension in patients already on three medications, with close monitoring of potassium levels 1, 4, 10, 8