Positive influence of aspirin on coronary endothelial function: Importance of the dose

Area of Science:

• Cardiovascular Medicine
• Pharmacology
• Endothelial Function

Background:

• Coronary endothelial dysfunction is a precursor to cardiovascular events.
• Aspirin is widely used for cardiovascular prevention, but its effect on endothelial function requires clarification.
• Dose-dependent effects of aspirin on vascular health are not fully understood.

Purpose of the Study:

• To evaluate the impact of different aspirin doses on coronary endothelial function.
• To determine if low-dose versus high-dose aspirin differentially affects endothelial responses.
• To identify the optimal aspirin dosage for improving coronary endothelial health.

Main Methods:

• A study involving 139 Japanese subjects with normal coronary arteries.
• Participants were divided into aspirin (100 mg or 500 mg) and control groups.
• Coronary vasodilation was assessed using acetylcholine and nitroglycerin infusions during angiography.

Main Results:

• Aspirin administration significantly increased acetylcholine-induced coronary vasodilation compared to controls.
• Low-dose aspirin (100 mg) showed a greater improvement in acetylcholine-induced dilation than high-dose aspirin (500 mg).
• Multivariate analysis identified low-dose aspirin as a significant factor for improved endothelial function.

Conclusions:

• Low-dose aspirin (100 mg) positively influences coronary endothelial function in individuals with normal coronary arteries.
• High-dose aspirin (500 mg) did not demonstrate a similar beneficial effect on endothelial function.
• Improved endothelial function with low-dose aspirin may contribute to its preventive role in coronary events.