| 1. |
|
|
| 2. |
- Laurent, Claes, 1958-, et al.
(författare)
-
Non-invasive monitoring of systolic blood preassure on arm utilizing photoplethysmography (PPG)
- 2000
-
Ingår i: World Congress of Medical Physics and Biomedical Engineering,2000. - : Springer-Verlag. ; , s. 131-135
-
Konferensbidrag (refereegranskat)abstract
- 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.
|
|
| 3. |
- Laurent, Claes, 1958-, et al.
(författare)
-
Noninvasive monitoring of systolic blood pressure on the arm utilizing photoplethysmography (PPG) : clinical report
- 2004
-
Ingår i: <em>Proc. SPIE</em> 5318, Advanced Biomedical and Clinical Diagnostic Systems II. - Bellingham WA, USA : SPIE. ; , s. 99-
-
Konferensbidrag (refereegranskat)abstract
- 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.
|
|
| 4. |
|
|
| 5. |
|
|
