Document Detail


Effect of site and intensity of pacing on left ventricular performance.
MedLine Citation:
PMID:  6644223     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of pacing site and intensity on left ventricular performance is examined. The maximal value of left ventricular developed pressure (PD) and the peak (dp/dt) /P (Vpm) were followed in 11 anesthetized dogs. The following sites were paced: atrial (A), simultaneous atrial and right ventricular (RV), simultaneous atrial, right and left ventricular (RLV) and simultaneous atrial and left ventricular (LV)(, while varying the rate from sinus rate up to 350/min and the intensity from threshold up to 20-120 mA. When all 4 sites were paced in the same experiment, the A pacing resulted in the highest values of Vpm and PD while RV pacing resulted in the lowest values. The higher the pacing intensity the higher the Vpm and PD values tended to be. The strongest correlation coefficient was observed between Vpm and intensity on RV pacing while the same correlation on LV or Rv pacing and between PD and intensity on LV pacing were not significant at the 5% level. On RV pacing a low (les than 0.85) Vpm ratio (Vpm on RV pacing expressed over Vpm on A pacing at the same frequency and intensity) was associated with 65% of 129 pacing runs at a relatively low (less than 35 mA) intensity but with only 35% of 91 runs at a higher intensity (X2 = 19,20, p less than 0.001). The effect of pacing site and intensity on Vpm tended to be more pronounced at faster than at slower pacing frequencies.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
S D Moulopoulos; D A Sideris; J N Nanas; D Economou; C Vemmos
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  16     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  1983 Oct 
Date Detail:
Created Date:  1984-01-27     Completed Date:  1984-01-27     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  409-15     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure
Cardiac Pacing, Artificial*
Dogs
Myocardial Contraction*
Ventricular Function

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


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