Objectives
Our aim was to explore whether the carotid/brachial pulse pressure (C/B-PP) ratio selectively predicts the gender difference in age-related cardiovascular death.
Background
Hypertension and cardiovascular complications are more severe in men and post-menopausal women than in pre-menopausal women. C-PP is lower than B-PP, and the C/B-PP ratio is a physiological marker of PP amplification between C and B arteries which tends toward 1.0 with age.
Methods
The study involved 72,437 men (aged 41.0±11.1 years, mean±SD) and 52,714 women (39.5±11.6 years). C-PP was calculated for each gender by a multiple regression analysis including B-PP, age, height and risk factors, a method validated beforehand in a subgroup of 834 subjects. During the 12 years of follow-up, 3028 men and 969 women died.
Results
In the total population, the adjusted hazard ratios (HR, 95% CI) of C/B-PP ratio were: (i) for all cause mortality: men, 1.51 (1.47–1.56), women, 2.46 (2.27–2.67) (p<0.0001); (ii) for cardiovascular mortality: men, 1.81 (1.70–1.93), women, 4.46 (3.66–5.45) (p<0.0001). The C/B-PP impact on mortality did not significantly increase from younger men to those over 55, from: 1.44 (1.31–1.58) to 1.65 (1.48–1.84), but increased significantly with age in women: 3.19 (2.08–4.89) vs 5.60 (4.17–7.50) (p<0.01). Thus the mortality impact of C/B-PP ratio was 3-fold higher in women than in men over 55.
Conclusions
The C/B amplification is highly predictive of differences in cardiovascular risk between men and women. In post-menopausal women, the attenuation of PP amplification, mainly related to increased aortic stiffness, contributes to the significant increase in cardiovascular risk.