Document Detail

Right ventricular assist device in end-stage pulmonary arterial hypertension: insights from a computational model of the cardiovascular system.
MedLine Citation:
PMID:  23009919     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The high mortality rate of pulmonary arterial hypertension (PAH) mainly relates to progressive right ventricular (RV) failure. With limited efficacy of medical therapies, mechanical circulatory support for the RV has been considered. However, there is lack of understanding of the hemodynamic effects of mechanical support in this setting.
METHODS: We modeled the cardiovascular system, simulated cases of PAH and RV dysfunction and assessed the theoretical effects of a continuous flow micro-pump as an RV assist device (RVAD). RVAD inflow was sourced either from the RV or RA and outflow was to the pulmonary artery. RVAD support was set at various flow rates and additional simulations were carried out in the presence of atrial septostomy (ASD) and tricuspid regurgitation (TR).
RESULTS: RVAD support increased LV filling, thus improving cardiac output and arterial pressure, unloading the RA and RV, while raising pulmonary arterial and capillary pressures in an RVAD flow-dependent manner. These effects diminished with increasing disease severity. The presence of TR did not significantly impact the hemodynamic effects of RVAD support. ASD reduced the efficacy of RVAD support, since right-to-left shunting decreased and ultimately reversed with increasing RVAD support due to the progressive drop in RA pressure.
CONCLUSIONS: The results of this theoretical analysis suggest that RVAD support can effectively increase cardiac output and decreases RA pressure with the consequence of increasing pulmonary artery and capillary pressures. Especially in advanced PAH, low RVAD flow rates may mitigate these potentially detrimental effects while effectively increasing systemic hemodynamics.
Lynn Punnoose; Daniel Burkhoff; Stuart Rich; Evelyn M Horn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Progress in cardiovascular diseases     Volume:  55     ISSN:  1873-1740     ISO Abbreviation:  Prog Cardiovasc Dis     Publication Date:    2012 Sep-Oct
Date Detail:
Created Date:  2012-09-26     Completed Date:  2012-12-11     Revised Date:  2013-05-02    
Medline Journal Info:
Nlm Unique ID:  0376442     Medline TA:  Prog Cardiovasc Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  234-243.e2     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Division of Cardiology, Weill Cornell Medical College, New York, NY, USA.
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MeSH Terms
Heart Failure / etiology,  physiopathology,  prevention & control*
Heart-Assist Devices*
Hypertension, Pulmonary / complications,  physiopathology,  therapy*
Models, Cardiovascular*
Ventricular Dysfunction, Right / complications,  physiopathology,  therapy*

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

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