Document Detail

Doppler measurement of cardiac output across prosthetic mitral valves.
MedLine Citation:
PMID:  2325355     Owner:  NLM     Status:  MEDLINE    
In 46 patients with a normal functioning mitral valve prosthesis (15 St. Jude, 19 Medtronic Hall, 12 Hancock) cardiac output was measured by pulsed Doppler echocardiography across the valve prosthesis. Simultaneously cardiac output was determined by thermodilution or pulsed Doppler echocardiography in the left ventricular outflow tract (2.8 l/min-9.5 l/min). The prosthetic valve area was calculated using the pressure half-time method. Cardiac output was calculated by multiplying time-velocity integrals with the mitral valve area. Cardiac output measurements across the mitral prosthesis correlated significantly with thermodilution (r = 0.96, SEE = 0.400 l/min) and pulsed Doppler echocardiography flow measurements in the left ventricular outflow tract (r = 0.82, SEE = 0.679 l/min). The mean percent error of the Doppler transmitral flow measurement was 10.8%. Doppler transmitral flow underestimated cardiac output valves of more than 6.5 l/min in 6 of 7 patients. Cardiac output measurements across Hancock (SEE = 0.473 l/min) and St. Jude prostheses (SEE = 0.538 l/min) were more accurate than across Medtronic Hall prostheses (SEE = 0.847 l/min). Cardiac output can be calculated by pulsed Doppler echocardiography across normal functioning mitral prostheses. Due to the different flow dynamics the accuracy of cardiac output measurement depends on the prosthetic valve type. Reliable measurements of cardiac output can be performed across Hancock and St. Jude prostheses only. This method is limited in volume flow measurements across Medtronic Hall prostheses.
H Dittmann; W Voelker; K R Karsch; L Seipel
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Klinische Wochenschrift     Volume:  68     ISSN:  0023-2173     ISO Abbreviation:  Klin. Wochenschr.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-05-18     Completed Date:  1990-05-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985205R     Medline TA:  Klin Wochenschr     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  263-8     Citation Subset:  IM    
Medizinische Klinik III, Eberhard-Karls-Universität Tübingen.
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MeSH Terms
Blood Flow Velocity / physiology
Echocardiography, Doppler*
Exercise Test
Heart Valve Prosthesis*
Middle Aged
Mitral Valve / physiopathology,  surgery*
Postoperative Complications / diagnosis*,  physiopathology
Prosthesis Design

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

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