Cuffless and Non-Invasive Estimation of a Continuous Blood Pressure Based on PTT

Kim, Young-Sung; Lee, Jeunwoo

doi:10.1109/itcs.2010.5581266

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…Prior works have developed watch-based PAT devices. The user touches the back of the watch with the opposing hand to obtain an ECG while LEDs are mounted to monitor wrist PPG [17, 38]. While this is a simple and convenient maneuver, the resulting BP measurement would be inaccurate in certain vasoactive interventions such as vasoconstriction [45].…”

Section: Related Workmentioning

confidence: 99%

SeismoWatch

Carek

Conant

Joshi

et al. 2017

Proc. ACM Interact. Mob. Wearable Ubiquitous Technol.

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The current norm for measuring blood pressure (BP) at home is using an automated BP cuff based on oscillometry. Despite providing a viable and familiar method of tracking BP at home, oscillometric devices can be both cumbersome and inaccurate with the inconvenience of the hardware typically limiting measurements to once or twice per day. To address these limitations, a wrist-watch BP monitor was developed to measure BP through a simple maneuver: holding the watch against the sternum to detect micro-vibrations of the chest wall associated with the heartbeat. As a pulse wave propagates from the heart to the wrist, an accelerometer and optical sensor on the watch measure the travel time – pulse transit time (PTT) – to estimate BP. In this paper, we conducted a study to test the accuracy and repeatability of our device. After calibration, the diastolic pressure estimations reached a root-mean-square error of 2.9 mmHg. The watch-based system significantly outperformed (p<0.05) conventional pulse arrival time (PAT) based wearable blood pressure estimations – the most commonly used method for wearable BP sensing in the existing literature and commercial devices. Our device can be a convenient means for wearable BP monitoring outside of clinical settings in both health-conscious and hypertensive populations.1

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Section: Related Workmentioning

confidence: 99%

SeismoWatch

Carek

Conant

Joshi

et al. 2017

Proc. ACM Interact. Mob. Wearable Ubiquitous Technol.

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“…Its error rate was higher than the commercial products, but it was a novel attempt which could approach the reliability of traditional BP measurement devices. 28 Zakaria et al recorded the values of PWTT and SBP in three experiments. According to the results of the experiments, three di®erent mathematical equations for calculation of SBP from PWTT were obtained.…”

Section: Discussionmentioning

confidence: 99%

A new approach for detecting sudden hypotension in hemodialysis by using dual-channel optical system

Amin

Golmakani

Joharinia

2017

J. Innov. Opt. Health Sci.

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Dialysis hypotension is one of the most prevalence symptoms of dialysis and occurs in 40% of treatment sessions. Detection and prediction of hypotension is important for the well-being of the patient and for optimizing treatment. The aim of this study was to construct optical system to monitor blood pressure (BP) continuously and without cu® in hemodialysis based on pulse transit time (PTT) method. To measure the BP changes, dual-channel optical system were developed. In this study, individuals were classi¯ed into two groups of normal and hemodialysis. In both groups, BP and consequently PTT were earned three times in di®erent positions. After the initial calibration, the regression equation was drawn for each subject. In normal group, each subject was placed in the supine position and BP was measured both by designed system and sphygmomanometer cu®. During BP measurements, in addition to BP, blood pressure decline was also monitored by optical system. For hemodialysis group, the same measurement setup was adopted. In both groups, the error between cu® method and PTT was calculated. Correlation coe±cients for BP cuff vs BP PTT were calculated and Bland-Altman plot was performed for the normal and hemodialysis groups. In this study 16 subjects participated. The results for normal group showed that maximum di®erence between cu® method and the present method was 14 mmHg and for dialysis group was 16 mmHg. Bland-Altman plot in normal group revealed limits of agreement from À13.98 to 13.18 mmHg. Considering hemodialysis group, limits of agreement were from * Corresponding author. This is an Open Access article published by World Scienti¯c Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. À15.94 to 13.88 mmHg. The correlation coe±cient was 0.74 for normal group and was 0.72 for hemodialysis group. The proposed system can monitor BP continuously and diagnose sudden hypotension. So it can be recommended as a useful method to indicate hypotension and can be used for dialysis unit.

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“…Source: Author Figure 4 shows the location in electrocardiogram time (above) and phototypesmogram (below) and from the presented graph, it can be seen that the distances between the vertices of the electrocardiogram, named RR intervals, coincide with the distance between the phototypesmogram peaks (PP intervals). According to the authors of Kim et al (2010) and Yoon et al (2009) it is possible to determine the blood pressure by the simultaneous use of an electrocardiogram and a phototypesmogram. For this purpose a method is used based on pulse wave delay, as measured by a photoplethysmograph, against the QRS complex of electrocardiogram.…”

Section: Principle оF Action Of Photoplethysmographic Methodsmentioning

confidence: 99%

Obtaining the Physiological Data Using the Photoplethysmographic Method

Cheshmedzhiev

Georgieva-Tsaneva

2018

CBUP

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The activity of the cardiovascular system is very important for the overall health of a human being. The Photoplethysmographic method is an effective tool of assessing the activity of the heart. The method is based on recording changes in blood volume in the blood vessels of the individual. The report presents a non-invasive way to obtain physiological data using a created device based on the Photoplethysmographic method. The created device consists of a photodetector, infrared light-emitting diodes, and small pulse rate sensors. The proposed portable device has been tested with three types of interfaces. The received data from the Photoplethysmographic device is transmitted to a personal computer and stored for further processing.

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Cuffless and Non-Invasive Estimation of a Continuous Blood Pressure Based on PTT

Cited by 15 publications

References 4 publications

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A new approach for detecting sudden hypotension in hemodialysis by using dual-channel optical system

Obtaining the Physiological Data Using the Photoplethysmographic Method

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