Document Detail


Effect of loading conditions on myocardial relaxation velocities determined by Doppler tissue imaging in heart transplant recipients.
MedLine Citation:
PMID:  9703234     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Cardiac allograft rejection is accompanied by cellular infiltration and tissue edema resulting in myocardial relaxation abnormalities. Doppler tissue imaging is capable of measuring myocardial relaxation velocities and is useful in the detection of heart rejection. However, the influence of ventricular loading conditions on myocardial relaxation velocities has not been studied. This study is performed to determine whether myocardial relaxation velocities are affected by left ventricular loading conditions. METHODS: Twenty heart transplant recipients without evidence of rejection by endomyocardial biopsy underwent preload and afterload reduction with nitroglycerin. The pulmonary wedge pressure was reduced from 18.2+/-0.9 to 12.0+/-0.9 mm Hg 9 (p=0.001) and the mean blood pressure from 130.0+/-5.6 to 116.1+/-7.0 mm Hg (p=0.001). Pulsed-wave Doppler tissue imaging was performed before and after administration of nitroglycerin, and the peak myocardial relaxation velocities of the inferior wall were measured. RESULTS: Myocardial relaxation velocities did not change with the administration of nitroglycerin; 0.188+/-0.009 to 0.178+/- 0.006 m/sec (p=0.4) in spite of a significant reduction in pulmonary capillary wedge pressure. Furthermore, there was no correlation between pulmonary capillary wedge pressure, mean arterial pressure, wall stress, and myocardial relaxation velocities. CONCLUSIONS: Loading conditions on the left ventricle have no influence on myocardial relaxation velocities. Therefore in heart transplant recipients changes in myocardial relaxation velocities by Doppler tissue imaging may be useful in the diagnosis of rejection, in spite of diverse loading conditions.
Authors:
J M Aranda; M W Weston; J A Puleo; H L Fontanet
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation     Volume:  17     ISSN:  1053-2498     ISO Abbreviation:  J. Heart Lung Transplant.     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1998-10-19     Completed Date:  1998-10-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9102703     Medline TA:  J Heart Lung Transplant     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  693-7     Citation Subset:  IM    
Affiliation:
University of South Florida College of Medicine, Division of Cardiology, Lifelink Transplantation Institute, Tampa, USA.
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MeSH Terms
Descriptor/Qualifier:
Echocardiography, Doppler, Color*
Graft Rejection*
Heart Transplantation / immunology,  physiology*,  ultrasonography
Humans
Middle Aged
Myocardial Contraction / physiology*
Nitroglycerin / diagnostic use
Vasodilator Agents / diagnostic use
Ventricular Function, Left / physiology
Chemical
Reg. No./Substance:
0/Vasodilator Agents; 55-63-0/Nitroglycerin

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


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