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2006
IEEE

A Preliminary Study of Respiratory Variations in the Photoplethysmogram during Lower Body Negative Pressure

9 years 6 months ago
A Preliminary Study of Respiratory Variations in the Photoplethysmogram during Lower Body Negative Pressure
Previous studies have shown that the photoplethysmogram (PPG) may be a useful tool for the noninvasive detection of hypovolemia. The focus has been on determining if frequency analysis of the respiratory induced variations of the PPG can be used as an indicator of blood volume. In this preliminary study, we evaluate these frequency analysis techniques for two subjects undergoing Lower Body Negative Pressure (LBNP) induced hypovolemia. Using MatlabĀ®-based software the power of the respiratory component and heart rate component were calculated using the periodogram method for spectral estimation. Consistent with other studies our algorithms were able to automatically detect changes in the respiratory variations. We found a significant increase in the respiratory variations in the PPG during simulated hypovolemia. By taking the ratio of the respiratory power to the heart rate power we consistently detected hypovolemia in subjects corresponding to sequestration of approximately 2 liters ...
Suzanne Wendelken, Stephen Paul Linder, Sue McGrat
Added 10 Jun 2010
Updated 10 Jun 2010
Type Conference
Year 2006
Where CBMS
Authors Suzanne Wendelken, Stephen Paul Linder, Sue McGrath
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