Caffeine and Cardiovascular Outcomes: Current Evidence and Clinical Perspectives

Area of Science:

• Cardiovascular Medicine
• Pharmacology
• Nutritional Science

Background:

• Caffeine is a widely consumed bioactive compound with complex cardiovascular effects.
• Evidence on caffeine's cardiovascular impact is mixed, with some studies suggesting risks and others benefits.
• Adenosine receptor antagonism by caffeine influences autonomic tone, vascular resistance, and heart rhythm.

Purpose of the Study:

• To review the current evidence on caffeine's cardiovascular effects.
• To evaluate the impact of different caffeine sources and consumption patterns.
• To inform cardiovascular counseling regarding caffeine intake.

Main Methods:

• Review of mechanistic, interventional, and epidemiologic studies on caffeine.
• Analysis of randomized controlled trials and cohort studies.
• Consideration of genetic variability and exposure patterns.

Main Results:

• Acute caffeine intake can transiently increase blood pressure and alter sympathetic activity.
• Habitual coffee consumption is linked to neutral or favorable cardiovascular outcomes, including reduced mortality.
• Energy drinks and concentrated caffeine sources show more pronounced hemodynamic and electrophysiologic effects.
• Evidence does not consistently support a proarrhythmic effect of habitual coffee consumption.
• Recent trials question the need for caffeine restriction in conditions like atrial fibrillation.

Conclusions:

• Caffeine's cardiovascular effects are dose-, source-, and patient-specific.
• Universal caffeine restriction is not supported by current evidence.
• A personalized approach is recommended for interpreting caffeine exposure in cardiovascular medicine.