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Wyznaczanie czasu propagacji Fali tętna w oparciu o sygnały EKG i PPG

Sieczkowski Krzysztof, Dobrowolski Andrzej P., Sondej Tadeusz, Olszewski Robert

Przegląd Elektrotechniczny

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2019

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R. 95, nr 11

101--104

PL

W artykule przedstawiono nowatorską metodę pozwalającą na wyznaczanie czasów propagacji fali tętna, która bazuje na jednoczesnym pomiarze sygnałów EKG i PPG. Kluczowa dla proponowanego algorytmu dokładność wyznaczenia początkowego i końcowego punktu pomiarowego danego sygnału, silnie zależy od procedur wstępnego przetwarzania. Proponowane rozwiązanie opiera się na rozwijanej przez autorów metodzie korelacji aktualizowanego na bieżąco wzorca sygnału z aktualnie analizowanym fragmentem sygnału.

EN

In this article was presented a novel method for determining a pulse transit time, which is based on simultaneous measurement of ECG and PPG signals. The key to the proposed algorithm, the accuracy of determining the starting and ending measuring point of a given signal, strongly depends on the pre-processing procedures. The proposed solution is based on the method of correlation of the currently updated signal pattern with the currently analyzed fragment of signal, developed by the authors.

2

Simultaneous multi-site measurement system for the assessment of pulse wave delays

Sondej Tadeusz, Sieczkowski Krzysztof, Olszewski Robert, Dobrowolski Andrzej

Biocybernetics and Biomedical Engineering

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2019

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Vol. 39, no. 2

488--502

EN

A precise, multi-track system for the simultaneous, real-time measurement of electrocardiographic (ECG) and many photopletysmographic (PPG) signals is described. This system allows the calculation of pulse wave delay parameters such as pulse arrival time (PAT) and pulse transit time (PTT). The measurement system was built on a custom, real-time embedded system with multiple specific analogue-front-end devices. Signals were recorded on-line and data were processed off-line in the Matlab software. Testing of human subjects was carried out on a group of 16 volunteers. The system was capable of taking a measurement of one 24-bit ECG and eight 22-bit PPG tracks with high precision (input-referred noise 1.4 mV for ECG and about 20 pA for PPG). All signals are sampled simultaneously (phase shift between ECG and PPG is only 1.5 ms for 250 Hz frequency sampling). Significant differences in pulse wave delays were found for the 16 subjects studied (e.g. about 100 ms for PAT on a right toe, 40 ms for differential PAT on left-right toes and about 100 ms for PTT calculated for forehead-right toe pulse wave). The proposed system provides a simultaneous and continuous evaluation of pulse wave delays for the entire arterial bed. The proposed measurement methods are comfortable and can be used for a long time. Simultaneous measurements of pulse wave delays at various sites increase the reliability of measurement and create new possibilities for medical diagnosis.

3

Projekt systemu zdalnego monitorowania zmian ciśnienia tętniczego krwi

Sieczkowski K., Sondej T., Dobrowolski A., Olszewski R.

Elektronika : konstrukcje, technologie, zastosowania

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2017

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Vol. 58, nr 1

17--21

PL

W artykule przedstawiono projekt systemu, przeznaczonego do zdalnego i ciągłego monitorowania zmian ciśnienia tętniczego krwi oraz wyniki badań testowych. Przedstawiony system złożony jest z osobistego urządzenia pomiarowego, punktu dostępowego do sieci Internet oraz ogólnodostępnego serwera danych. Istotnym elementem projektowanego systemu jest metoda ciągłego pomiaru zmian ciśnienia krwi, polegająca na określaniu czasu propagacji fali tętna. Czas ten wyznaczany jest pomiędzy charakterystycznym punktem sygnału elektrokardiograficznego (EKG) i sygnału fotopletyzmograficznego (PPG). W artykule przedstawiono wyniki badań testowych, dotyczących wyznaczania punktów charakterystycznych sygnału EKG i PPG metodą autokorelacyjną oraz wyniki pomiaru zmian czasu propagacji fali tętna.

EN

The article presents the design of the system for remote and continuous monitoring of changes in blood pressure and also results of the test. Presented system consists of a personal measuring device, the access point to the Internet and widely available data server. An important element of the designed system is a method for continuous measurement of changes in blood pressure, which based on determining the pulse wave transit time. This time is calculated between the specific point electrocardiogram (ECG) signal and the photoplethysmographic signal (PPG). The article presents the results of test on the determination of specific points of the ECG signal and the PPG based on autocorrelation method and the results of measuring changes in pulse wave transit time.

4

Noninvasive Blood Pressure Measurement Methods

Sorvoja H., Myllylä R.

Molecular and Quantum Acoustics

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2006

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Vol. 27

239-264

EN

This paper review the historical background of noninvasive blood pressure measurement methods with their accuracies achieved and explains the requirements for common national and international standards of accuracy. Also are shortly described the development of blood pressure measurement system and a method, named electronic palpation method (EP), suitable for the long-term measurement of heart rate and blood pressure using a cuff on the upper arm and a pressure sensor array on the radial artery.

5

Accuracy Comparison of Oscillometric and Electronic Palpation Blood Pressure Measuring Methods Using Intra-Arterial Method as a Reference

Sorvoja H., Myllylä R., Kärjä-Koskenkari P., Koskenkari J., Lilja M., Antero Kesäniemi Y.

Molecular and Quantum Acoustics

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2005

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Vol. 26

235-260

EN

This paper evaluates blood pressure measurements by the electronic palpation method (EP) and compares their accuracy to that of the oscillometric method (OSC) using average intra-arterial (IA) blood pressure as a reference. All of these three measurements were made simultaneously for each patient. The EP method, based on noninvasively detecting the amplitude of pressure pulsations in the radial artery, differs from the ordinary palpation method by allowing also diastolic pressure to be determined from the pulse delay produced by cuff pressure. In one test group, measurements were conducted on healthy volunteers in sitting and supine position during increasing and decreasing cuff pressure. Another group, comprising older, cardiac patients, was measured only in the supine position during cuff inflation. The results showed that the EP method was approximately as accurate as the OSC method with the healthy subjects and slightly more accurate with the cardiac patient group. The advantage of the EP method is that also the wave shape and velocity of arterial pressure pulses is available for further analysis like the assessment of arterial stiffness. Keywords: noninvasive, blood pressure, cuff, pulse transit time, pulse wave velocity

6

Blood Pressure Measurement Method Using Pulse-Transit-Times

Sorvoja H., Hast J., Myllylä R., Kärjä-Koskenkari P., Nisilla S., Sorvisto M.

Molecular and Quantum Acoustics

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2003

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Vol. 24

169-181

EN

This paper describes a method of measuring blood preasure based on pulse-transit-time. Transducer array based on electro-mechanical film material was employed to detect pulsations non-invasively on the radial artery, while its blood flow was blocked by an occluding cuff. Venous blood preasure was measured simultaneously from a vein on the same hand, and into-arterial blood preasure was obtained from the radial artery on the other hand by means of a catheter tip. Blood preasure was measured in 16 healthy young persons in supine and sitting position during increasing and decreasing cuff preasure. Correlation calculations were performed to assess the performance of the transducer array and the accuracy of the measurement.