Prognostic role of heart rate in patients referred for coronary angiography: age and sex differences

Abstract

Objective To evaluate the predictive value of resting heart rate (RHR) for cardiac and total mortality in a large population of patients referred for coronary angiography with an extended follow-up, stratified in four subpopulations according to gender and age (50th percentile corresponding to 67 years).

Methods We studied 3559 subjects (2603 males, age: 66 ± 11 years, mean ± SD), obtaining patient data from the Institute electronic databank which saves demographic, clinical, instrumental and follow-up data of patients admitted to our department.

Results During a mean follow-up period of 35 ± 25 months, 296 (8%) patients died; there were 173 (5%) cardiac deaths. In female patients irrespective of age, RHR (≥ 76 bpm, 75th percentile) did not appear predictive for cardiac death. In females, RHR was predictive for overall mortality after multivariate adjustment only in those aged ≥ 67 years (hazard ratio (HR) 1.7, 95% confidence interval (CI) 1–2.8, p ≤ 0.05). In male patients aged < 67 years, RHR remained as an independent predictive factor for overall mortality at the multivariate analysis (HR 2.5, 95% CI 1.5–4.2, p < 0.001), and as an independent predictor for both cardiac mortality (HR 1.8, 95% CI 1.2–2.7, p < 0.01) and total mortality (HR 1.6, 95% CI 1.2–2.3, p < 0.01) in male patients over 67 years.

Conclusion The current study suggests that the prognostic importance of RHR may differ according to the patient's gender and age, suggesting significant differences in cardiovascular physiopathology between female and male patients.

Key words::

• RESTING HEART RATE
• GENDER
• CARDIOVASCULAR DISEASE
• PROGNOSIS
• CARDIAC MORTALITY
• OVERALL MORTALITY

Conflict of interest The authors report no conflict of interest. The authors alone are responsible for the content and writing of this paper.

Source of funding Nil.