Macrocirculation is not the sole determinant of respiratory induced variations in the reflection mode photoplethysmographic signal
- 31 October 2003
- journal article
- clinical trial
- Published by IOP Publishing in Physiological Measurement
- Vol. 24 (4), 925-937
- https://doi.org/10.1088/0967-3334/24/4/009
Abstract
Photoplethysmography (PPG) is a non-invasive optical technique sensitive to variations in blood volume and perfusion in the tissue. Reflection mode PPG may have clinical advantages over transmission mode PPG. To improve clinical usefulness and further development of the reflection mode PPG, studies on factors that modify the signal are warranted. We studied the coherence between the respiratory induced intensity variations (RIIV) of the PPG signal and respiratory synchronous pressure variations in central venous pressure (CVP), peripheral venous pressure (PVP) and arterial blood pressure (ABP) during positive pressure ventilation on 12 patients under anaesthesia and on 12 patients with spontaneous breathing. During positive pressure ventilation the coherence between all signals was high. Inspiration was followed first by an increase in CVP, then by increases in ABP and PVP and lastly by RIIV indicating less back-scattered light. In spontaneously breathing patients the coherence was high, but the phases between the signals were changed. During inspiration, ABP decreased slightly before CVP, followed by a decrease in RIIV and PVP. The phase relation between RIIV and respiratory induced variation in macrocirculation changed with ventilatory mode, but not in a uniform way, indicating the influence of mechanisms other than macrocirculation involved in generating the RIIV signal.Keywords
This publication has 21 references indexed in Scilit:
- Neural network for photoplethysmographic respiratory rate monitoringMedical & Biological Engineering & Computing, 2003
- Estimation of respiratory volumes from the photoplethysmographic signal. Part I: experimental resultsMedical & Biological Engineering & Computing, 1999
- Estimation of respiratory volumes from the photoplethysmographic signal. Part 2: a model studyMedical & Biological Engineering & Computing, 1999
- Monitoring of Heart and Respiratory Rates in Newborn Infants Using a New Photoplethysmographic TechniqueJournal of Clinical Monitoring and Computing, 1999
- Autonomic Control of Skin Microvessels: Assessment by Power Spectrum of Photoplethysmographic WavesClinical Science, 1996
- Determinants of systolic pressure variation in patients ventilated after vascular surgeryJournal of Cardiothoracic and Vascular Anesthesia, 1995
- PhotoplethysmographyMedical & Biological Engineering & Computing, 1991
- PHOTO-ELECTRIC PLETHYSMOGRAPHY AS A MONITORING DEVICE IN ANAESTHESIABritish Journal of Anaesthesia, 1985
- Filling and emptying of the low-pressure blood vessels of the human forearm.Journal of Applied Physiology, 1966
- Effect of Respiratory Movements on Superior Cava Flow Under Normal and Abnormal ConditionsAmerican Journal of Physiology-Legacy Content, 1953