Document Detail


The index of motor current amplitude has feasibility in control for continuous flow pumps and evaluation of left ventricular function.
MedLine Citation:
PMID:  11722345     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The index of motor current amplitude (ICA) has feasibility in continuous-flow ventricular assist device control. It can demonstrate the safe range of pump speed, which exists between the starting point of total assistance (t-point) and the starting point of sucking (s-point). The objective of this study was to investigate how the ICA characteristic curve changes with each condition of contractility, preload, and afterload changes. We changed preload, afterload, and contractility of closed-mock circulation and plotted the change of the ICA value against pump speed. Then the shift of ICA characteristic curve against the change of each condition was considered. When preload increased, ICA characteristic curves showed the expansion of a safe range. When afterload increased, ICA characteristic curves were shifted to the high rotation side, slightly narrowing a safe range. When contractility increased, ICA characteristic curves showed the shift of a convex above to narrowing of a safe range. As these shift patterns were observed even when the driving conditions of a circuit changed, reproducibility was checked. Understanding the feature of a shift pattern of ICA characteristic curves correctly, a possibility that change of the heart function could be predicted by change of ICA value and a possibility for a flexible control method based on ICA, according to hemodynamic state, were suggested.
Authors:
G Endo; K Araki; K Kojima; K Nakamura; Y Matsuzaki; T Onitsuka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Artificial organs     Volume:  25     ISSN:  0160-564X     ISO Abbreviation:  Artif Organs     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-11-27     Completed Date:  2002-01-30     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7802778     Medline TA:  Artif Organs     Country:  United States    
Other Details:
Languages:  eng     Pagination:  697-702     Citation Subset:  IM    
Affiliation:
Second Department of Surgery, Miyazaki Medical College, 5200 Kihara, Kiyotake Miyazaki 889-1692, Japan.
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MeSH Terms
Descriptor/Qualifier:
Blood Flow Velocity / physiology
Equipment Design
Heart-Assist Devices*
Hemorheology
Humans

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


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