ACE inhibitors in hypertension treatment
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Mechanism of Action and Role of ACE Inhibitors in Hypertension
Angiotensin-converting enzyme (ACE) inhibitors are a major class of drugs used to treat hypertension. They work by blocking the conversion of angiotensin I to angiotensin II, a hormone that causes blood vessels to constrict and raises blood pressure. By inhibiting this process, ACE inhibitors promote vasodilation, reduce blood pressure, and decrease the workload on the heart 1234+1 MORE. This mechanism also leads to increased levels of bradykinin, a vasodilator, which can contribute to some side effects 38.
Efficacy and Dosing of ACE Inhibitors for Blood Pressure Control
ACE inhibitors are considered first-line therapy for hypertension, alongside thiazide diuretics, calcium channel blockers, and angiotensin receptor blockers (ARBs) 23. Studies show that all ACE inhibitors have similar blood pressure-lowering effects, with no one drug being superior. A dose at half the manufacturer’s maximum recommendation achieves about 90% of the maximum blood pressure reduction, which averages around 8 mm Hg systolic and 5 mm Hg diastolic . Most of the effect is achieved at starting doses, and higher doses do not provide significantly greater benefit .
Safety, Tolerability, and Side Effects
ACE inhibitors are generally well tolerated, but they can cause side effects such as cough and angioedema due to increased bradykinin levels 38. Compared to ARBs, ACE inhibitors have a higher risk of these side effects, while ARBs offer similar blood pressure control with better tolerability . In older patients, ACE inhibitors are effective and avoid some metabolic disturbances seen with beta-blockers and diuretics . When combined with thiazide diuretics or calcium channel blockers, ACE inhibitors are safe and effective, with a favorable side effect profile 29.
Special Considerations: Ethnic Differences and Combination Therapy
In Black patients, ACE inhibitors as monotherapy may be less effective for lowering blood pressure compared to other groups, and there may be increased cardiovascular risks. However, when used in combination with a calcium channel blocker or thiazide diuretic, ACE inhibitors are effective and safe, with no evidence of increased adverse outcomes 269. Current guidelines recommend combination therapy as the preferred approach for most patients 26.
Advances and Alternatives: Natural and Novel ACE Inhibitors
There is growing interest in natural ACE inhibitors derived from marine resources and food proteins, such as bioactive peptides from whey protein hydrolysates. These natural compounds may offer blood pressure-lowering effects with fewer side effects, and research is ongoing to develop them as nutraceuticals or pharmaceuticals for hypertension management 17810.
Conclusion
ACE inhibitors are a cornerstone in the treatment of hypertension, offering effective blood pressure reduction and additional cardiovascular benefits. They are best used as part of combination therapy, especially in certain populations, and are generally safe and well tolerated. Ongoing research into natural ACE inhibitors may provide new options for hypertension management in the future.
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