Document Detail

Continuous noninvasive monitoring of left ventricular function during exercise by thoracic impedance cardiography-automated derivation of systolic time intervals.
MedLine Citation:
PMID:  7064793     Owner:  NLM     Status:  MEDLINE    
Systolic time intervals (STI) obtained during exercise are useful as a method of estimating global left ventricular function. The conventional method, however, which requires a carotid pulse tracing as well as a phonocardiogram of high quality, is technically difficult under conditions of exercise. We have validated a new method of obtaining STI which employs the first derivative of thoracic electrical impedance (DZ/DT). The DZ/DT was recorded using surface electrodes and a microcomputer for automated signal processing. The new method was studied in 20 male normal subjects (aged 18 to 53 years) at rest and during increasing levels of upright exercise. Heart rate ranged from 61 to 173 beats/min. Results obtained simultaneously by both techniques showed no significant difference. Thus impedance cardiography allows continuous monitoring of STI during exercise and may prove to be a valuable addition to multistage stress testing.
D S Sheps; M L Petrovick; P N Kizakevich; C Wolfe; E Craige
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  103     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1982 Apr 
Date Detail:
Created Date:  1982-05-27     Completed Date:  1982-05-27     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  519-24     Citation Subset:  AIM; IM    
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MeSH Terms
Cardiography, Impedance / methods
Carotid Arteries / physiology
Exercise Test
Middle Aged
Monitoring, Physiologic / methods*
Myocardial Contraction*
Time Factors
Ventricular Function*

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

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