Document Detail


Effect of acute pericardial tamponade on the relative contributions of systolic and diastolic pulmonary venous return: a transesophageal pulsed Doppler study.
MedLine Citation:
PMID:  7817905     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of acute pericardial tamponade on pulmonary venous return was assessed by transesophageal pulsed Doppler echocardiography. In 14 open-chest anesthetized dogs peak pulmonary venous flow velocities in systole (VJ) and in diastole (VK) were measured during apnea and atrial pacing while acute tamponade was induced by intrapericardial instillation of 0.9% sodium chloride solution. Before intravascular volume expansion, induction of acute tamponade resulted in a significant decline in VK (43 +/- 17 to 19 +/- 8 cm/sec; p < 0.05) but no change in VJ or the ratio VJ/VK. After intravascular volume expansion, induction of acute tamponade resulted in significant reductions in VJ (43 +/- 9 to 29 +/- 10 cm/sec; p < 0.001) and VK (37 +/- 19 to 15 +/- 11 cm/sec; p < 0.001). The effect was disproportionately greater on VK, however, resulting in a significant increase in VJ/VK (1.51 +/- 0.84 to 2.58 +/- 1.41; p < 0.001). The disproportionate effect of acute tamponade on VK suggests that increased pericardial pressure directly constrains diastolic filling of the left atrium as a conduit to the left ventricle and that it does not decrease the systolic and diastolic phases of pulmonary venous return uniformly. Intravascular volume expansion increases cardiac output before acute tamponade, but during acute tamponade it amplifies the disproportionate impact of increased pericardial pressure on left ventricular diastolic filling as the left ventricle is constrained within the fluid-filled pericardial sac.
Authors:
E K Louie; R J Hariman; Y Wang; M H Hwang; H S Loeb; P J Scanlon
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  129     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1995 Jan 
Date Detail:
Created Date:  1995-02-09     Completed Date:  1995-02-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  124-31     Citation Subset:  AIM; IM    
Affiliation:
Division of Cardiology, Loyola University Medical Center, Maywood, IL 60153.
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MeSH Terms
Descriptor/Qualifier:
Acute Disease
Analysis of Variance
Animals
Blood Flow Velocity
Cardiac Pacing, Artificial
Cardiac Tamponade / chemically induced,  physiopathology*,  ultrasonography*
Diastole
Disease Models, Animal
Dogs
Echocardiography, Transesophageal* / instrumentation,  methods,  statistics & numerical data
Electrocardiography
Heart Atria / physiopathology
Male
Pulmonary Veins / physiopathology*,  ultrasonography*
Sodium Chloride
Systole
Chemical
Reg. No./Substance:
7647-14-5/Sodium Chloride

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


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