期刊
JOURNAL OF THE AMERICAN HEART ASSOCIATION
卷 6, 期 1, 页码 -出版社
WILEY
DOI: 10.1161/JAHA.116.004903
关键词
aortic stiffness; characteristic impedance; global longitudinal strain; left ventricle function; pulse wave velocity; ventricular/vascular coupling hemodynamics
资金
- Ellison Foundation
- National Heart, Lung and Blood Institute's Framingham Heart Study [N01-HC-25195, HHSN268201500001I]
- [T32 GM74905]
- [R00HL107642]
- [R01HL131532]
- [R01HL093328]
- [R01HL107385]
- [R01HL126136]
Background- Aortic stiffness impairs optimal ventricular-vascular coupling and left ventricular systolic function, particularly in the long axis. Left ventricular global longitudinal strain (GLS) has recently emerged as a sensitive measure of early cardiac dysfunction. In this study, we investigated the relation between aortic stiffness and GLS in a large community-based sample. Methods and Results- In 2495 participants (age 39-90 years, 57% women) of the Framingham Offspring and Omni cohorts, free of cardiovascular disease, we performed tonometry to measure arterial hemodynamics and echocardiography to assess cardiac function. Aortic stiffness was evaluated as carotid-femoral pulse wave velocity and as characteristic impedance, and GLS was calculated using speckle tracking-based measurements. In multivariable analyses adjusting for age, sex, height, systolic blood pressure, augmentation index, left ventricular structure, and additional cardiovascular risk factors, increased carotid-femoral pulse wave velocity (B +/- SE: 0.122 +/- 0.030% strain per SD, P<0.0001) and characteristic impedance (0.090 +/- 0.029, P=0.002) were both associated with worse GLS. We observed effect modification by sex on the relation between characteristic impedance and GLS (P=0.004); in sex-stratified multivariable analyses, the relation between greater characteristic impedance and worse GLS persisted in women (0.145 +/- 0.039, P= 0.0003) but not in men (P=0.73). Conclusions- Multiple measures of increased aortic stiffness were cross-sectionally associated with worse GLS after adjusting for hemodynamic variables. Parallel reductions in left ventricular long axis shortening and proximal aortic longitudinal strain in individuals with a stiffened proximal aorta, from direct mechanical ventricular-vascular coupling, offers an alternative explanation for the observed relations.
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