Document Detail


Feasibility of measuring myocardial performance index of the right ventricle in anesthetized patients.
MedLine Citation:
PMID:  19945298     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Myocardial performance index, the sum of the 2 isovolumic times divided by the ejection time, contains information on global systolic and diastolic function. This study was performed to determine the feasibility of right ventricular myocardial performance index measurements if measured by transesophageal echocardiography in patients under general anesthesia and positive-pressure ventilation. DESIGN: A prospective cohort study. SETTING: A tertiary care university hospital. PARTICIPANTS: Twenty patients undergoing elective coronary artery bypass graft surgery. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: The feasibility of the right ventricular myocardial performance index measurements was assessed in awake patients by using transthoracic echocardiography and reassessed in the same patients under general anesthesia and positive-pressure ventilation using transesophageal echocardiography. The time from the cessation to the onset of 2 consecutive right ventricular inflows was measured as time A; the time from the onset to the cessation of right ventricular ejection was measured as time B. Myocardial performance index was calculated as follows: (time A-time B)/time B. A first reader independently measured all recordings twice to assess intrareader variability and a second reader once to assess interreader variability. Variability (%) was calculated as the mean absolute difference between 2 readings divided by their mean. The myocardial performance index could be measured for all patients. The point estimates of inter- and intraobserver variability of the right ventricular myocardial performance index measurements were 4.3% to 5% in awake patients and 17.8% to 19.6% in anesthetized patients. CONCLUSIONS: This finding questions the use of right ventricular myocardial performance index measurements in anesthetized patients under positive-pressure ventilation.
Authors:
Isabelle Michaux; Manfred Seeberger; Regina Schuman; Karl Skarvan; Miodrag Filipovic
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-11-27
Journal Detail:
Title:  Journal of cardiothoracic and vascular anesthesia     Volume:  24     ISSN:  1532-8422     ISO Abbreviation:  J. Cardiothorac. Vasc. Anesth.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-05     Completed Date:  2010-11-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9110208     Medline TA:  J Cardiothorac Vasc Anesth     Country:  United States    
Other Details:
Languages:  eng     Pagination:  270-4     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Elsevier Inc. All rights reserved.
Affiliation:
Department of Anesthesia, University Hospital Basel, Basel, Switzerland. isabelle.michaux@uclouvain.be
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MeSH Terms
Descriptor/Qualifier:
Anesthesia, General* / standards
Cohort Studies
Coronary Artery Bypass / standards
Echocardiography, Transesophageal / standards
Feasibility Studies
Heart Rate / physiology
Humans
Positive-Pressure Respiration / standards
Prospective Studies
Stroke Volume / physiology*
Ventricular Function, Right / physiology*

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


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