PS 05-73 THE DEGREE OF CHANGES IN BLOOD PRESSURE AFTER RE-FLOW OF BRACHIAL ARTERY DURING BLOOD PRESSURE MEASUREMENT MIGHT BE PREDICT ARTERIAL STIFFNESS

The Ausculatory and the Oscillometric are the most commonly used blood pressure measurement methods worldwide. However, the ausculatory method requires professionally trained observers and is not suitable for automatic BP measurement; while the oscillometric method is less accurate in wide age groups. A new BP measurement method is introduced here which determines the subject’s BP value by features of the waveform measured by a strain sensor on the arm skin. During the cuff based measurement process, blood pulses in the brachial artery lead to artery deformations, which transfer to the arm surface in the form of surface strain and to the cuff in the form of cuff pressure oscillation. Since the cuff volume and amount of air keeps changing during the measurement, arm surface strain changes are more related to blood pulse. A piezoelectric film strain sensor is placed on the arm surface above the brachial artery to measure the surface strain. Since the artery closure statuses are different during the BP measurement process, the unique features of the measured waveform are observed in our previous study. Using these features, the subject’s BP can be determined. The analysis of these features and their relation to the subject’s BP are illustrated in this paper.

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NOVEL METHOD FOR ASSESSING ARTERIAL STIFFNESS BASED ON OSCILLOMETRIC BLOOD PRESSURE MEASUREMENT

Journal of Mechanics in Medicine and Biology ◽

10.1142/s0219519418400109 ◽

2018 ◽

Vol 18 (07) ◽

pp. 1840010

Author(s):

CHI ZHANG ◽

YONGJIA GAO ◽

TAOCHEN LONG ◽

YI DU ◽

XIAOXU HOU ◽

...

Keyword(s):

Blood Pressure ◽

Arterial Stiffness ◽

Brachial Artery ◽

Mechanical Characteristics ◽

Pulse Wave ◽

Arterial Compliance ◽

Blood Pressure Measurement ◽

Physiological Significance ◽

Novel Method ◽

Oscillometric Blood Pressure Measurement

Arterial stiffness is a major contributor to cardiovascular diseases. The aim of this study is to explore the physiological significance of the brachial mechanical parameters, which could be estimated from oscillometric blood pressure (BP) measurement, and investigate on the potential of these arterial parameters as an index of arterial stiffness. The mechanical characteristics of brachial artery were modeled based on the collapsible tube theory, which includes two important parameters to describe the compliance of brachial artery. After the model validation, the arterial parameters were estimated from the measured oscillometric envelope of 56 subjects by solving an inverse problem. The physiological significance of these parameters was explored by analyzing their association with pulse wave velocity (PWV) as well as with the BP. Arterial compliance parameters were successfully estimated from the envelope of the oscillometric pulse wave in the BP measurement. The parameters were found to be linearly associated with age, PWV, and BP. These results suggest that our method may provide a potential approach to assess arterial compliance based on oscillometric measurement of BP.

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