Document Detail

Experimental instrumentation and left ventricular pressure-strain relationship.
MedLine Citation:
PMID:  1750527     Owner:  NLM     Status:  MEDLINE    
Pericardial pressure measurement with a balloon transducer requires opening and reapproximating the pericardium. If this instrumentation significantly compromises pericardial volume, the heart may be constrained, exaggerating the magnitude of pericardial pressure and thus altering the left ventricular end-diastolic pressure-volume relationship. In open-chest dogs, we studied the effects of opening the pericardium, inserting a pericardial balloon transducer and myocardial sonomicrometer crystals, and reapproximating the pericardium on the left ventricular end-diastolic pressure-strain relationship (LVEDPSR). After a thoracotomy, sonomicrometer crystals were inserted through small holes (less than 3 mm) in the pericardium to measure LV segment length. A micromanometer with a reference lumen was used to measure LV pressure. LVEDPSRs were recorded in the following situations: 1) before the pericardium was opened (but after the crystals were inserted); 2) after the pericardium was opened, the heart was instrumented (4 pairs of crystals and 1 balloon), and the pericardium was reapproximated with interrupted sutures; and 3) after the pericardium was removed. For each dog, a cubic regression equation was fitted to the data obtained before opening the pericardium, and the 95% confidence intervals for the individual data points were determined. In each case, the LVEDPSR obtained after instrumentation was similar to the LVEDPSR described before opening the pericardium. Furthermore, data obtained after instrumentation were uniformly located within the confidence intervals of the LVEDPSR obtained before opening the pericardium and instrumenting the heart.(ABSTRACT TRUNCATED AT 250 WORDS)
N W Scott-Douglas; M Traboulsi; E R Smith; J V Tyberg
Related Documents :
9878317 - A novel arresting solution for study of postmortem pressure--volume curves of the rat l...
9014797 - Effects of incoordination on left ventricular force-velocity relation in aortic stenosis.
1357197 - Effect of alpha 1-adrenoceptor blockade on the left ventricular force-length relationsh...
17947217 - Effect of triangle ventricular pacing on haemodynamics and dyssynchrony in patients wit...
3384077 - Effects of diffuse pleural thickening on respiratory mechanics.
1466217 - Elimination of apparatus dead space--a simple method for improving co2 removal without ...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  261     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-01-23     Completed Date:  1992-01-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1693-7     Citation Subset:  IM    
Department of Medicine, University of Calgary, Alberta, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Heart Function Tests / instrumentation*
Pericardium / physiology
Stroke Volume
Transducers, Pressure
Ventricular Function, Left / physiology*

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

Previous Document:  Areas of rostral medulla providing tonic control of renal and splenic nerves.
Next Document:  Glycolysis is predominant source of myocardial ATP production immediately after birth.