British Journal of Anaesthesia, 1985, Vol. 57, No. 5 524-530
© 1985 The Board of Management and Trustees of the British Journal of Anaesthesia
research-article |
PHOTO-ELECTRIC PLETHYSMOGRAPHY AS A MONITORING DEVICE IN ANAESTHESIA
Application and Interpretation
Institute of Anaesthesiology, AZG, State University of Groningen Oostersingel 59, 9713 EZ Groningen, The Netherlands
The optical principle of photo-electric plethysmography is described and the clinical significance of changes in the amplitude of the plethysmogram discussed. Physiologically, changes in blood volume pulsations depend on the distensibility of the vessel wall as well as on the intravascular pulse pressure. The importance of both factors in the interpretation of changes in the arterial pulse amplitude is illustrated by examples from 500 continuous recordings. In addition, it is shown that changes in the height of ventilatory waves maybe of diagnostic significance.
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