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Application of color Doppler flow mapping to calculate orifice area of St Jude mitral valveBACKGROUND: The effective orifice area (EOA) of a prosthetic valve is superior to transvalvular gradients as a measure of valve function, but measurement of mitral prosthesis EOA has not been reliable. METHODS AND RESULTS: In vitro flow across St Jude valves was calculated by hemispheric proximal isovelocity surface area (PISA) and segment-of-spheroid (SOS) methods. For steady and pulsatile conditions, PISA and SOS flows correlated with true flow, but SOS and not PISA underestimated flow. These principles were then used intraoperatively to calculate cardiac output and EOA of newly implanted St Jude mitral valves in 36 patients. Cardiac output by PISA agreed closely with thermodilution (r=0.91, Delta=-0.05+/-0.55 L/min), but SOS underestimated it (r=0.82, Delta=-1.33+/-0.73 L/min). Doppler EOAs correlated with Gorlin equation estimates (r=0.75 for PISA and r=0.68 for SOS, P<0.001) but were smaller than corresponding in vitro EOA estimates. CONCLUSIONS: Proximal flow convergence methods can calculate forward flow and estimate EOA of St Jude mitral valves, which may improve noninvasive assessment of prosthetic mitral valve obstruction.
Document ID
20040172556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Leung, D. Y.
(Cleveland Clinic Foundation Cleveland, Ohio, United States)
Wong, J.
Rodriguez, L.
Pu, M.
Vandervoort, P. M.
Thomas, J. D.
Date Acquired
August 22, 2013
Publication Date
September 22, 1998
Publication Information
Publication: Circulation
Volume: 98
Issue: 12
ISSN: 0009-7322
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cardiopulmonary
Non-NASA Center

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