Document Detail


Continuous measurement of left ventricular volume in animals and humans by conductance catheter.
MedLine Citation:
PMID:  6386218     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An eight-electrode conductance catheter previously developed by us and used to determine stroke volume in dogs was applied in human beings and dogs to measure absolute left ventricular volume quantitatively. For calibration we developed the formula V(t) = (1/alpha)(L2/sigma b)G(t) - Vc, where V(t) is time-varying left ventricular volume, alpha is a dimensionless constant, L is the electrode separation, sigma b is the conductivity of blood obtained by a sampling cuvette, and G(t) is the measured conductance within the left ventricular cavity. Vc is a correction term caused by the parallel conductance of structures surrounding the cavity and is measured in two ways. The first method, applicable in the anesthetized animal, consists of temporary reduction of volume to zero by suction. The second method uses a transient change in sigma b by injection of a small bolus of hypertonic saline (dogs) or 10 ml of cold glucose (humans) into the pulmonary artery. The validity of the formula was previously established for the isolated postmortem canine heart. The predicted linearity, slope constant alpha, and accuracy of Vc for the left ventricle in vivo were investigated by comparing the conductance volume data with results from independent methods: electromagnetic blood flow measurement for stroke volume and indicator dilution technique for ejection fraction (dogs), thermal dilution for cardiac output (12 patients), and single-plane cineventriculography for V(t) (five patients). In all comparisons, linear regression showed high correlation (from r = .82 [n = 46] to r = .988 [n = 20]) while alpha, with one exception, ranged from 0.75 to 1.07 and the error in Vc ranged from 0.5% to 16.5% (mean 7%). After positioning of the catheter, no arrhythmias were observed. It is concluded that the conductance catheter provides a reliable and simple method to measure left ventricular volume, giving an on-line, time-varying signal that is easily calibrated. Together with left ventricular pressure obtained through the catheter lumen, the instrument may be used for instantaneous display of pressure-volume loops to facilitate assessment of left ventricular pump performance.
Authors:
J Baan; E T van der Velde; H G de Bruin; G J Smeenk; J Koops; A D van Dijk; D Temmerman; J Senden; B Buis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Circulation     Volume:  70     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1984 Nov 
Date Detail:
Created Date:  1984-12-05     Completed Date:  1984-12-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  812-23     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Cardiac Volume*
Dogs
Electric Conductivity
Electrodes
Heart Catheterization / instrumentation*,  veterinary
Heart Ventricles / anatomy & histology
Humans
Indicator Dilution Techniques
Pressure
Saline Solution, Hypertonic
Stroke Volume
Suction
Thermodilution
Ventricular Function
Chemical
Reg. No./Substance:
0/Saline Solution, Hypertonic

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


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