Cardiac index (CI) versus cardio ankle vascular index (CAVI) at different degrees of head-up tilt (HUT) in healthy subjects

Akeel A. M. H. Zwain, Riyadh W. Al Esawi, Amina A. B. Al-Dejeli

Department of Clinical Physiology, College of Medicine, University of Kufa, Najaf, Iraq.
Department of Non-Invasive Cardiovascular Studies, Najaf Cardiac Centre, AlSadr-Teaching Hospital, Kufa College of Medicine, Najaf, Iraq.

DOI: 10.4236/ojmip.2013.32011                

Abstract

The cardio-ankle vascular index (CAVI) is a new index of arterial stiffness that can be measured with a VaSera VS-1000 device. An association between certain arterial stiffness indices and cardiac function has been found but has not yet been validated. The aim of this study was to establish whether any significant relationship exists between cardiac index (CI) and CAVI. Twenty healthy male volunteers with a mean age of 30 ± 5 years and a mean BMI of 23.1 ± 1.1 kg/m2 participated in the study. CO was estimated using a Doppler technique, and CAVI was measured with a VaSeraVS-1000 device. A motorised tilting table was used to achieve head-up tilt (HUT) angles of 0°, 30°and 60°, to modify the peripheral sympathetic outflow. We found that there was a significant inverse correlation between CI and the degree of head-up tilt, ( for 0°and 30°; for 0° and 60°, p < 0.001 for both; for 30° and 60°, ). CAVI showed a significant positive correlation relative with the degree of HUT, ( for 0° and 30°; for 0° and 60°; for 30° and 60°, for all). A significant negative correlation was found between CI and CAVI r = - 0.47, p < 0.05. Additionally, a significant p < 0.001 increase in PVR values was observed for increasing HUT values. In conclusion: An inverse relationship between CI and CAVI was shown; a decrease in cardiac output is associated with an increase in CAVI values at different degrees of HUT. This association provides further insight into the postural link between cardiac output and arterial compliance.

Keywords

Cardiac Index; Cardio-Ankle Vascular Index;Atherosclerosis; Head-Up Tilt

Conflicts of Interest

The authors declare no conflicts of interest.

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