Document Detail

Coronary rheothermia: a quasi non-invasive method for controlling bypass patency.
MedLine Citation:
PMID:  6189256     Owner:  NLM     Status:  MEDLINE    
A method based on the principle of thermodilution was developed for a quasi non-invasive permeability control of aortocoronary bypass. An epivascularly-attached thermistor records the cooling of the bypass wall when, following the intravenous injection of 5 to 10 ml of a NaCl solution at 4 degrees C, a bolus of cooled blood passes through the bypass. During cardiosurgical intervention, the thermistor is attached to the venous bridge by one or 2 sutures. The efferent cable goes through the thorax wall and is coupled to a subcutaneously implanted telemetric amplifier unit. The influence of the vessel wall on the perivascular temperature signal, as compared to the intravascular one, was studied in acute and chronic animal experiments. In acute experiments the perivascular peak of temperature was found to be lower than the intravascular one. Continuous measurements over 9 days showed variations in the perivascular signals which must have been due to changes in the thermal capacity of the tissue coupled to the thermistor as well as to changes in resistance caused by a variable extent of scarred area and by the varying water content of the wound bed. These variables will continue to keep rheothermia within the limitations of a method with primarily binary results (= bypass: open or closed). Given stable coupling conditions after full development of the scar around the thermistor, the signal falsification by the then constantly coupled tissue capacity becomes calculable such as to obtain semiquantitative results which, theoretically should vary predominantly with cardiac output.
P P Lunkenheimer; C Konermann; D Weritz; C Meyer; F Wallner; F Klinke; A Lunkenheimer; N Stroh; F Köhler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Thoracic and cardiovascular surgeon     Volume:  31     ISSN:  0171-6425     ISO Abbreviation:  Thorac Cardiovasc Surg     Publication Date:  1983 Feb 
Date Detail:
Created Date:  1983-06-10     Completed Date:  1983-06-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7903387     Medline TA:  Thorac Cardiovasc Surg     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  58-64     Citation Subset:  IM    
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MeSH Terms
Body Temperature*
Cold Temperature
Coronary Artery Bypass*
Coronary Vessels / pathology
Thermodilution / methods*
Time Factors

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

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