Attenuation of Systolic Blood Pressure and Pulse Transit Time Hysteresis During Exercise and Recovery in Cardiovascular Patients

	Attenuation of Systolic Blood Pressure and Pulse Transit Time Hysteresis During Exercise and Recovery in Cardiovascular Patients
	Qing Liu; Yan, B.P.; Cheuk-Man Yu; Yuan-Ting Zhang; Poon, C.C.Y.
刊名	IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
	2014
英文摘要	Pulse transit time (PTT) is a cardiovascular parameter of emerging interest due to its potential to estimate blood pressure (BP) continuously and without a cuff. Both linear and nonlinear equations have been used in the estimation of BP based on PTT. This study, however, demonstrates that there is a hysteresis phenomenon between BP and PTT during and after dynamic exercise. A total of 46 subjects including 16 healthy subjects, 13 subjects with one or more cardiovascular risk factors, and 17 patients with cardiovascular disease underwent graded exercise stress test. PTT was measured from electrocardiogram and photoplethysmogram of the left index finger of the subject, i.e., a pathway that includes predominately aorta, brachial, and radial arteries. The results of this study showed that, for the same systolic BP (SBP), PTT measured during exercise was significantly larger than PTT measured during recovery for all subject groups. This hysteresis was further quantified as both normalized area bounded by the SBP-PTT relationship (AreaN) and SBP difference at PTT during peak exercise plus 20 ms (Delta SBP20). Significant attenuation of both AreaN (p < 0.05) and Delta SBP20 (p < 0.01) is observed in cardiovascular patients compared with healthy subjects, independent of resting BP. Since the SBP-PTT relationship are determined by the mechanical properties of arterial wall, which is predominately mediated by the sympathetic nervous system through altered vascular smooth muscle (VSM) tone during exercise, results of this study are consistent with the previous findings of autonomic nervous dysfunction in cardiovascular patients. We further conclude that VSM tone has a nonnegligible influence on the BP-PTT relationship and thus should be considered in the PTT-based BP estimation.
收录类别	SCI
原文出处	http://ieeexplore.ieee.org/xpl/abstractAuthors.jsp?arnumber=6645391
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/5717]
专题	深圳先进技术研究院_医工所
作者单位	IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
推荐引用方式 GB/T 7714	Qing Liu,Yan, B.P.,Cheuk-Man Yu,et al. Attenuation of Systolic Blood Pressure and Pulse Transit Time Hysteresis During Exercise and Recovery in Cardiovascular Patients[J]. IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING,2014.
APA	Qing Liu,Yan, B.P.,Cheuk-Man Yu,Yuan-Ting Zhang,&Poon, C.C.Y..(2014).Attenuation of Systolic Blood Pressure and Pulse Transit Time Hysteresis During Exercise and Recovery in Cardiovascular Patients.IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING.
MLA	Qing Liu,et al."Attenuation of Systolic Blood Pressure and Pulse Transit Time Hysteresis During Exercise and Recovery in Cardiovascular Patients".IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING (2014).