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Valvular Regurgitation in a Biventricular Mock Circulatory Loop

Shehab, Sajad*,†; Allida, Sabine M.*; Newton, Phillip J.*,†; Robson, Desiree; Macdonald, Peter S.†,‡,§; Davidson, Patricia M.*,†,¶; Jansz, Paul C.; Hayward, Christopher S.†,‡,§

doi: 10.1097/MAT.0000000000000852
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Aortic regurgitation (AR), mitral regurgitation (MR), and tricuspid regurgitation (TR) after continuous-flow left ventricular assist device (LVAD) are common and may increase with prolonged LVAD support. The aim of this study was to simulate severe valvular regurgitation (AR, MR, and TR) within a 4-elemental pulsatile mock circulatory loop (MCL) and observe their impact on isolated LVAD and biventricular assist device (BiVAD) with HeartWare HVAD. Aortic regurgitation, MR, and TR were achieved via the removal of one leaflet from bileaflet mechanical valve from the appropriate valves of the left or right ventricles. The impact of alteration of LVAD pump speed (LVAD 2200–4000 RPM, right ventricular assist device [RVAD] 2400 RPM) and altered LVAD preload (10–25mm Hg) was assessed. With each of the regurgitant valve lesions, there was a decrease in isolated LVAD pump flow pulsatility. Isolated LVAD provided sufficient support in the setting of severe MR or TR compared with control, and flows were enhanced with BiVAD support. In severe AR, there was no benefit of BiVAD support over isolated LVAD, and actual loop flows remained low. High LVAD flows combined with low RVAD flows and dampened aortic pressures are good indicators of AR. The 4-elemental MCL successfully simulated several control and abnormal valvular conditions using various pump speeds. Current findings are consistent with conservative management of MR and TR in the setting of mechanical support, but emphasize the importance of the correction of AR.

From the *Centre for Cardiovascular & Chronic Care, Faculty of Health, University of Technology Sydney

Cardiology Department, St Vincent’s Hospital Sydney

Victor Chang Cardiac Research Institute

§School of Medicine, University of New South Wales

School of Nursing, Johns Hopkins University.

Submitted for consideration May 2017; accepted for publication in revised form April 2018.

C.S.H. has received research funds from HeartWare Inc. unrelated to the current study. This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

Supplemental digital content is available for this article. Direct URL citations appear in the printed text, and links to the digital files are provided in the HTML and PDF versions of this article on the journal’s Web site (www.asaiojournal.com).

Disclosure: The authors have no conflicts of interest to report.

Correspondence: Christopher S. Hayward, Cardiology Department, St Vincent’s Hospital 390 Victoria Street Darlinghurst, NSW 2010 Australia. Email: cshayward@stvincents.com.au.

Copyright © 2019 by the American Society for Artificial Internal Organs