Document Detail

Clinical evaluation of an automatic blood pressure controller during cardiac surgery.
MedLine Citation:
PMID:  9269620     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: During surgery, computers can be of great use to support the anesthesiologist in providing task automation. In this paper we describe a closed loop blood pressure controller and show the results of its clinical evaluation. METHODS: The controller is based on a simple and robust Proportional-Integral controller and a supervising, rule based, expert system. Adaptive control is necessary because the sensitivity of the patients to sodium nitroprusside varies over a wide range. Thirty-three clinical tests during cardiac surgery, including the cardiopulmonary bypass phase, were performed. RESULTS: On average the controller was in automatic mode for 90.6 +/- 9.6% of the time. The performance during automatic control showed the mean arterial pressure to be within 10 mmHg of the setpoint for 71.4 +/- 15.5% of the time. The average absolute distance to the setpoint was 8.1 +/- 7.2 mmHg. CONCLUSIONS: The overall performance of the controller was noted as very satisfactory by the anesthesiologists.
R H Meijers; D Schmartz; F R Cantraine; L Barvais; A A d'Hollander; J A Blom
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of clinical monitoring     Volume:  13     ISSN:  0748-1977     ISO Abbreviation:  J Clin Monit     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-10-16     Completed Date:  1997-10-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8506707     Medline TA:  J Clin Monit     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  261-8     Citation Subset:  IM    
Department of Computer Science, Faculty of Medicine, Free University of Brussels (ULB), Belgium.
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MeSH Terms
Analog-Digital Conversion
Aortic Valve / surgery
Blood Pressure / drug effects
Blood Pressure Monitors*
Cardiac Surgical Procedures* / instrumentation
Cardiopulmonary Bypass
Computer Systems
Coronary Artery Bypass
Equipment Design
Evaluation Studies as Topic
Expert Systems
Infusion Pumps
Mitral Valve / surgery
Monitoring, Intraoperative / instrumentation*
Nitroprusside / administration & dosage,  therapeutic use
Signal Processing, Computer-Assisted
Vasodilator Agents / administration & dosage,  therapeutic use
Reg. No./Substance:
0/Vasodilator Agents; 15078-28-1/Nitroprusside

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

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