We investigated the independent and combined association of resting heart rate (RHR expressed as beats/min, bpm) and body mass index (BMI) with SYNTAX score (SS) in patients with stable angina. We divided 312 patients into 4 groups according to RHR quartiles: Q1 (<65 bpm), Q2 (65-69 bpm), Q3 (70-79 bpm), and Q4 (≥80 bpm). The SS (12.0 ± 9.0, 16.0 ± 15.5, 18.0 ± 16.5, and 20.0 ± 27.5; P < .001) was significantly higher for those in Q4 than for those in Q1, Q2, and Q3. Multivariate logistic regression analysis indicated that each 10-bpm increment in RHR was significantly associated with SS (odds ratio [OR] 1.62, 95% confidence interval [CI] 1.27-2.06). Patients with high RHR and high BMI had significantly greater odds ratio (OR) of high SS (4.03, 95% CI 2.00-8.14), compared to participants with low RHR and low BMI. Both RHR and BMI were independent predictors of coronary atherosclerosis as assessed by SS. RHR in combination with BMI and multivariate logistic regression analysis emphasized the importance of the correlation between RHR and SS in patients with stable angina pectoris.
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