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ID 116568
Title Alternative
Paradoxical increase in the PPG amplitude
Author
Kamiya, Satoshi Hiroshima University
Nakamura, Ryuji Hiroshima University
Saeki, Noboru Hiroshima University
Keywords
Photoplethysmography
sympathetic response
vascular stiffness
Content Type
Journal Article
Description
Background : Although an increase in sympathetic nerve activity is generally associated with a decrease in the photoplethysmography (PPG) amplitude, the present case study demonstrates that nociceptive stimuli, such as tracheal intubation, paradoxically induce an increase in PPG amplitude. To the best of our knowledge, this is the first study to capture an increase in the PPG amplitude in response to sympathetic nerve activation. Case presentation : A 73-year-old woman underwent open surgery. Following anesthesia induction, tracheal intubation was performed, which resulted in increased heart rate and raised blood pressure. While nociception usually decreases the PPG amplitude, the opposite was found. Conversely, the vascular stiffness K value, our research group’s unique monitoring method to quantify the strength of sympathetic activity, increased reflecting increased peripheral vascular resistance. Conclusions : We report a paradoxical case of increased PPG amplitude following tracheal intubation. It is important to note that the PPG amplitude does not always decrease with nociceptive stimuli.
Journal Title
The Journal of Medical Investigation
ISSN
13496867
13431420
NCID
AA11166929
Publisher
Tokushima University Faculty of Medicine
Volume
68
Issue
3-4
Start Page
383
End Page
385
Sort Key
383
Published Date
2021-08
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences