Document Detail

The origin of inverted waveforms in the reflection plethysmogram.
MedLine Citation:
PMID:  7171418     Owner:  NLM     Status:  MEDLINE    
In reflection plethysmography at the finger inverted pulsewaves are sometimes observed, especially when, during anaesthesia, arterial pressure is measured in the same arm with an inflatable cuff. The origin of this inversion is investigated to two series experiments with volunteers. In the first series of experiments the influence of the pressure in the upper arm cuff was investigated and in the second series the influence of the application pressure of the transducer on the finger. It is concluded that inversion of the pulse waves of the plethysmogram is local phenomenon restricted to the reflection method. It is caused by a relative increase in the optical density of the surrounding tissue in relation to the arterial vessels. In the finger it is brought about by venous engorgement and it is dependent on the applied pressure.
J A Nijboer; J C Dorlas
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of anaesthesia     Volume:  54     ISSN:  0007-0912     ISO Abbreviation:  Br J Anaesth     Publication Date:  1982 Dec 
Date Detail:
Created Date:  1983-02-14     Completed Date:  1983-02-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372541     Medline TA:  Br J Anaesth     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1289-93     Citation Subset:  IM    
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MeSH Terms
Blood Pressure
Fingers / blood supply*
Middle Aged
Plethysmography / methods*
Transducers, Pressure
Veins / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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