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Long-term effects of antihypertensives on blood lipids
1Department of Medical Cardiology, Victoria Infirmary, Glasgow, UK.
Insights
Long-term use of calcium antagonists and ACE inhibitors shows no adverse effects. Thiazide diuretics and beta-blockers have unclear long-term impacts on cardiovascular health, with mixed effects on lipid profiles.
Area of Science:
- Cardiovascular pharmacology
- Lipid metabolism
Background:
- Common antihypertensive agents include calcium antagonists, ACE inhibitors, thiazide diuretics, and beta-blockers.
- Long-term effects of these medications on cardiovascular health and lipid profiles require thorough investigation.
Purpose of the Study:
- To review and synthesize the available literature on the long-term effects of common antihypertensive agents, specifically thiazide diuretics and beta-blockers, on lipid profiles and atherosclerotic risk.
Main Methods:
- Literature review of studies examining the effects of antihypertensive agents on lipid and lipoprotein levels.
- Analysis of short-term (less than six months) and long-term (more than six months) therapeutic effects.
Main Results:
- Calcium antagonists and ACE inhibitors show no apparent adverse long-term effects.
- Thiazide diuretics may increase LDL cholesterol short-term, but long-term effects on lipids and atherosclerotic risk remain unclear, with some trials suggesting a blunting of cholesterol decline.
- Beta-blockers consistently raise triglycerides and may decrease total HDL cholesterol, but effects on HDL subfractions (HDL2, HDL3) are complex, and significant increase in atherosclerotic risk is unlikely.
Conclusions:
- Calcium antagonists and ACE inhibitors are associated with favorable long-term safety profiles regarding lipid metabolism.
- The long-term cardiovascular implications of thiazide diuretics and beta-blockers require further clarification due to conflicting data and complex effects on lipid profiles.
Abstract:
Considering the long-term effects of the commonly used antihypertensive agents, there appear to be no apparent adverse effects with calcium antagonists and angiotensin converting enzyme (ACE) inhibitors. The literature available concerning the effects of thiazide diuretics and beta-blockers is extensive and rather confusing. In the case of thiazide diuretics, a review of the literature indicates that in the short-term (therapy for less than six months) thiazide diuretics induce a rise in total cholesterol, total triglycerides and low density lipoprotein (LDL) cholesterol, with a possible fall in high density lipoprotein (HDL). If this was translated into long-term effects it could be associated with an increased risk of atherosclerotic disease. However, the long-term effects (therapy for more than six months) are unclear. Several large-scale trials of antihypertensive therapy using diuretics have suggested that the use of diuretics may have reduced the rate of decline of cholesterol levels which would otherwise have occurred. The literature on the effects of beta-blockers on blood lipids and lipoproteins is extensive and conflicting. The most consistent finding is a rise in triglycerides and there is some evidence that this may be due to the inhibition of lipoprotein lipase. Some authors have found an associated fall in total HDL cholesterol. However, analysis of the effects on the main HDL subfractions (HDL2 and HDL3) show an increase in HDL2 and a decrease in HDL3, which may counteract the possibly detrimental reduction in total HDL. Since triglyceride levels have only weak relationship to atherosclerotic risk it seems unlikely that beta-blockers significantly increase this risk.