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Measure the pressure and measure it right, at the brachial artery with infrared light
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the development and assessment of an optical probe and instrument based on photoplethysmography (PPG) for monitoring of systolic blood pressure on the upper arm. The development procedure steps have included investigation of best probe position above the brachial artery, probe location underneath the occlusion cuff and also assessment of the ability of infrared light to mirror a blood flow related signal from a deeper vascular depth where the brachial artery is found. In addition, a digital PPG instrument has been developed and adapted to requirements from both a technical and clinical perspective. Design of algorithms for automatic blood pressure determination has been performed and used but they are not fully optimised yet. The technique was assessed in a study and the correlation factor, r=o.95. The difference between blood pressure obtained using the PPG method and invasive blood pressure was 3.9 ± 9.1 mmHg (mean± SD), n=19.

The work in this thesis demonstrates that PPG in combination with a specially designed probe can monitor the systolic blootl pressure at the upper arm. A robust algorithm for automatic pressure determination and presentation and a probe permanently integrated within the cuff is a prerequisite for the coming technical development. Recent technological developments facilitate ambulatory monitoring systems within which fields our system is clearly adaptable.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 2004. , 38 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1129
Series
LiU-TEK-LIC, 58
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-23613Local ID: 3103ISBN: 91-85295-83-3 (print)OAI: oai:DiVA.org:liu-23613DiVA: diva2:243928
Presentation
2004-11-26, Aulan, Hälsans Hus, Universitetssjukhuset, Linköping, 13:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-13
List of papers
1. Noninvasive monitoring of systolic blood pressure on the arm utilizing photoplethysmography (PPG): clinical report
Open this publication in new window or tab >>Noninvasive monitoring of systolic blood pressure on the arm utilizing photoplethysmography (PPG): clinical report
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2004 (English)In: Proc. SPIE 5318, Advanced Biomedical and Clinical Diagnostic Systems II / [ed] Gerald E. Cohn; Warren S. Grundfest; David A. Benaron; Tuan Vo-Dinh, Bellingham WA, USA: SPIE , 2004, 99- p.Conference paper, Published paper (Refereed)
Abstract [en]

A soft (silicone) probe, containing six light emitting diodes (880 nm) and three photo detectors, utilizes photoplethysmography (PPG) to monitor pulsations from the brachialis artery under an occluding cuff during deflation. When the arterial pulse returns, measured by PPG, the corresponding pressure in the cuff is determined. This pressure is assumed to equal the systolic pressure. An assessment trial was performed on 21 patients (9 women and 12 men, aged 27-69) at the Neuro-Intensive care unit. Since the patients were already provided with arterial needles, invasive blood pressure could be used as the reference. By choosing a threshold, for detecting pulses, as a fraction (4%) of the maximum amplitude, the systolic blood pressure was underestimated (-0.57 mmHg, SD 12.1). The range of systolic pressure for the patients was 95.5 - 199.0 mmHg, n=14. The method is promising, but improvements still have to be made in order to improve the technique.

Place, publisher, year, edition, pages
Bellingham WA, USA: SPIE, 2004
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-22175 (URN)10.1117/12.529092 (DOI)1305 (Local ID)1305 (Archive number)1305 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-13
2. Non-invasive measurement of systolic blood pressure on the arm utilising photoplethysmography: development of the methodology
Open this publication in new window or tab >>Non-invasive measurement of systolic blood pressure on the arm utilising photoplethysmography: development of the methodology
2005 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 43, no 1, 131-135 p.Article in journal (Refereed) Published
Abstract [en]

Photoplethysmography (PPG) can be used to measure systolic blood pressure at the brachial artery. With a specially designed probe, positioned in the most distal position beneath a pressure cuff on the upper arm, this is possible. The distance between the light source (880 nm) and the photodetector was 20 mm. A test was performed on neuro-intensive care patients by determining blood pressure from the PPG curves, and, when it was compared with systolic blood pressure obtained from inserted indwelling arterial catheters, a correlation factor of r=0.95 was achieved. The difference between blood pressure obtained using PPG and invasive blood pressure measurement was 3.9±9.1 mmHg (mean±SD), n=19. The depth to the brachial artery was 13.9±4.1 mm (mean±SD), n=18. A digital PPG system utilising pulsating light was also developed.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-29570 (URN)10.1007/BF02345134 (DOI)000226938000020 ()14945 (Local ID)14945 (Archive number)14945 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13

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  • apa
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