Establishment of non- invasive blood pressure system by using PPG

Autor: Ching-Yi Chou, 周靜怡
Rok vydání: 2017
Druh dokumentu: 學位論文 ; thesis
Popis: 106
As the hypertensive rate increase, hypertensive tends to strike patients at young age. Preventive medicine can obviously take hold if arterial blood pressure can be monitored anytime and anywhere. Photoplethysmography can tell variation of blood volume on fingertip and lots of physiological information. Apart from that, the device contains several benefits including easy setup, non-invasive measurement and low price. Therefore, this dissertation, which is based on PPG photoelectric technology and arterial hemodynamics presents a new physiological parameters ΔRI (Delta Reflection Index). Applying dicrotic notch as a critical indicator, and Bernoulli's principle as calculation criteria can determine ΔRI. Further, following the above-mentioned rules an estimate systolic blood pressure and diastolic blood pressure. PPG Intensity Ratio, t1 & t2 ratio and Pulse Wave Velocity are three common algorithms to calculate arterial blood pressure in current literatures. With using single PPG device, PIR and t1 & t2 have the advantages of non-invasive measurement and convenient to operate. However, health condition of the experimental subjects deviate from reference because of following standard blood pressure or standard atrial contraction and diastolic time as a reference value. Pulse Wave Velocity gives small percentage of error and stability in the different state of the trial, but it needs to have access to both PPG and electrocardiography, which cause inconvenient operation As the results obtained general physiological state, it shows that not only can ΔRI(Error value about SBP: 5.18% and BBP: 8.32%) keep the advantages of PIR and t1 & t2 ratio (Average error value about SBP:9.89% and DBP:15.13%), it also has the similar error to PWV(Error value about SBP: 5.98% and BBP: 8.68%).
Databáze: Networked Digital Library of Theses & Dissertations
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