Document Detail


Progressive right ventricular failure is not explained by myocardial ischemia in a pig model of right ventricular pressure overload.
MedLine Citation:
PMID:  19117766     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Current concepts of acute pulmonary embolism suggest that right ventricular (RV) dilatation and failure are the consequence of pressure overload-induced RV hypoperfusion and ischemia. METHODS: Sixteen human-sized hybrid pigs were instrumented for the measurement of RV and aortic pressure, aortic and right coronary artery blood flow (RCA BF), RV oxygen consumption (RV MVO(2)) and RV free wall segment length. The pulmonary artery was constricted (PAC) to increase RV peak pressure acutely 2.5-fold (from 27+/-2 to 64+/-3 mmHg, n=9), and the constriction was maintained for 6h. RESULTS: At 10 min after PAC, a RV work index (RVWI, RV pressure-segment length loops) was increased 2.3-fold, indicating an initial RV adaptation to increased afterload. At 1h, 3h and 6h after PAC, however, RVWI decreased progressively towards control levels, while RCA BF and RV MVO(2) continued to increase. The arterial-coronary venous pH difference did not increase throughout the protocol. Arterial troponin T concentration increased from 0.08+/-0.03 to 0.80+/-0.20ng/ml at 6h after PAC. None of the parameters changed in control animals (n=7). CONCLUSION: We conclude that in our model RV failure during PAC develops in spite of increased coronary blood flow and MVO(2). Thus, mechanisms different from ischemia may contribute to progressive RV failure after pulmonary embolism.
Authors:
Jan D Schmitto; Hilmar Doerge; Heiner Post; Marlon Coulibaly; Christian Sellin; Aron F Popov; Samuel Sossalla; Friedrich A Schoendube
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Publication Detail:
Type:  Journal Article     Date:  2008-12-30
Journal Detail:
Title:  European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery     Volume:  35     ISSN:  1873-734X     ISO Abbreviation:  Eur J Cardiothorac Surg     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-26     Completed Date:  2009-11-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804069     Medline TA:  Eur J Cardiothorac Surg     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  229-34     Citation Subset:  IM    
Affiliation:
Department of Thoracic-, Cardiac- and Vascular Surgery, Universitätsmedizin Goettingen, Georg-August-Universität Goettingen, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Coronary Circulation / physiology
Disease Models, Animal
Disease Progression
Female
Heart Failure / blood,  etiology*,  physiopathology
Hemodynamics
Hydrogen-Ion Concentration
Male
Myocardial Ischemia / blood,  complications*,  physiopathology
Oxygen Consumption / physiology
Pulmonary Embolism / blood,  complications*,  physiopathology
Sus scrofa
Troponin T / blood
Ventricular Dysfunction, Right / blood,  etiology*,  physiopathology
Chemical
Reg. No./Substance:
0/Troponin T

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


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