Arterial haemodynamics on ventricular hypertrophy in rats with simulated aortic stiffness |
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Authors: | Hsing I Chen Nan-Kuang Hsieh Huai-Ren Chang Cheng-Tao Hu |
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Institution: | (1) Institute of Integrative Physiology and Clinical Sciences, Tzu Chi University, No. 701, Sec. 3, Jhongyang Rd., Hualien, 97004, Taiwan;(2) Department of Family Medicine, Tao-Yuan General Hospital, Taoyuan, Taiwan;(3) School of Medicine, Tzu Chi University, Hualien, Taiwan;(4) Adlink Technology Inc., Taipei, Taiwan |
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Abstract: | Aortic stiffness (AS) exerts significant impact on the cardiovascular risks. We developed a new model to produce AS. The purposes
were to evaluate the haemodynamic consequence and to correlate the haemodynamic parameters with the extent of ventricular
hypertrophy (VH). We applied silicon gel for embedding of the abdominal and/or thoracic aorta. After 1–4 weeks of AS, the
left ventricular weight (LVW), LVW to body weight (BW) ratio (LVW/BW), and the morphological changes in cardiomyotes were
quantified for VH. We determined the aortic pressure (AP), stroke volume, cardiac output, total peripheral resistance (TPR),
characteristic impedance (Zc), pulse wave reflection (Pb) and pulse wave velocity (PWV). Aortic embedding (AE) increased LVW, LVW/BW, systolic and pulse pressure (PP), Zc, Pb and PWV accompanied by decreases in diastolic pressure and arterial compliance. The magnitude of these haemodynamic and cardiac
changes were in an order of combined, thoracic and abdominal AE. Correlation analysis revealed that the VH was well correlated
with pulsatile haemodynamics such as Zc, PP, Pb and PWV, while less with steady components (Mean AP and TPR). Our results indicate that pulsatile haemodynamic parameters
are significantly elevated after AS. The alterations in pulsatile haemodynamics are the major causes leading to VH. |
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Keywords: | Arterial haemodynamics Aortic embedding Aortic stiffness Ventricular afterload Ventricular hypertrophy |
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