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Published on: June 7, 2016
Use of Angiotensin receptor blockers in cardiovascular protection: current evidence and future directions
1Dr. Munger is Professor of Pharmacotherapy and Internal Medicine and Associate Dean of Academic Affairs at the College of Pharmacy of the University of Utah in Salt Lake City, Utah.
Insights
Angiotensin II receptor blockers (ARBs) show varied vascular effects and outcomes, offering cardio-protection beyond blood pressure reduction. Further research is needed to differentiate ARBs for clinical use.
Area of Science:
- Cardiology
- Pharmacology
- Nephrology
Background:
- Angiotensin II receptor blockers (ARBs) are widely used for cardiovascular conditions.
- Their pleiotropic effects beyond blood pressure lowering are increasingly recognized.
Purpose of the Study:
- To differentiate ARBs based on vascular effects and outcomes in cardio-protective trials.
- To explore the independent contribution of ARBs' pleiotropic effects to cardiovascular protection.
Main Methods:
- Conducted MEDLINE searches (2003-2009) for RAAS blockade, ARBs, and cardio-protection terms.
- Included clinical trials with cardiovascular endpoints and hypertension guidelines.
- Identified ongoing trials via ClinicalTrials.gov.
Main Results:
- ARBs exhibit distinct vascular protective pleiotropic effects and pharmacokinetic profiles.
- These properties may contribute to reduced cardiovascular morbidity and mortality independently of BP lowering.
- ARBs demonstrate efficacy in hypertension, left ventricular hypertrophy, post-MI, and heart failure.
Conclusions:
- Emerging data support ARB effectiveness in various cardiovascular conditions.
- The role of pleiotropic effects, independent of BP lowering, requires further investigation.
- Comparative-effectiveness studies are essential to clinically differentiate ARBs; future ARBs may offer multifunctional benefits.
Objective:
To differentiate angiotensin II receptor blockers (ARBs) by vascular effects and outcomes in trials on cardio-protective endpoints.
Data Sources:
MEDLINE searches were conducted from January 2003 to March 2009 using the following search terms: renin-angiotensin-aldosterone system (RAAS) blockade or inhibition; angiotensin II receptor blocker (ARBs); cardio-protection; vascular protection; end-organ protection; candesartan; eprosartan, irbesartan; losartan; olmesartan; telmisartan; and valsartan. Ongoing and recruiting clinical trials were identified via Clinicaltrials.gov (July 2008).
Study Selection And Data Abstraction:
Pertinent basic science research and clinical trials with cardiovascular endpoints and information from reviews, American Heart Association 2009 statistics, and The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure guidelines were included in this review.
Data Synthesis:
ARBs differ in their vascular protective pleiotropic effects and pharmacokinetic properties, which may contribute to their pharmacological protection to reduce cardiovascular morbidity and mortality, independently of their blood pressure (BP)-lowering effects.
Conclusion:
Emerging data show that ARBs are effective in hypertension, left ventricular hypertrophy, postmyocardial infarction, and heart failure. To what extent their pleiotropic effects, independent of BP lowering, contribute to these outcomes will be the focus of research in the coming years. Well-designed, comparative-effectiveness studies are needed to clinically differentiate this class of agents. The future will be marked by multifunctional ARBs that will pharmacologically do more than antagonize the angiotensin type I (AT(1)) receptor.
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