Heart rate and cardiovascular mortality: the Framingham Study

Area of Science:

• Cardiology
• Preventive Medicine
• Epidemiology

Background:

• Resting heart rate (RHR) is a potential indicator of cardiovascular health.
• Previous studies suggest a link between elevated RHR and cardiovascular events.
• Long-term data on RHR and diverse mortality outcomes are crucial.

Purpose of the Study:

• To investigate the long-term association between biennial resting heart rate measurements and all-cause, cardiovascular, and coronary mortality.
• To explore sex-specific differences in this relationship.
• To determine if the association is independent of established cardiovascular risk factors.

Main Methods:

• Analysis of the Framingham Heart Study cohort data.
• Inclusion of 5070 participants initially free of cardiovascular disease.
• Biennial electrocardiogram (ECG) examinations and 30-year mortality follow-up (1876 total deaths, 894 cardiovascular deaths).

Main Results:

• Progressively increasing all-cause, cardiovascular, and coronary mortality rates with higher antecedent RHR in both sexes and all ages.
• Stronger association between RHR and cardiovascular disease in men, independent of risk factors.
• Increased case fatality rates and sudden coronary death fraction with higher RHR, particularly in younger men (35-64 years).
• Excess non-cardiovascular deaths observed at high RHR.

Conclusions:

• Elevated resting heart rate is a significant predictor of long-term mortality, including cardiovascular and coronary causes.
• The association is more pronounced in men and appears independent of pre-existing cardiac damage or common risk factors.
• RHR may serve as a valuable, accessible biomarker for cardiovascular risk stratification.