Proper leaflet coaptation of the mitral valve is vital for a healthy functioning heart. Chordal tension directly affects leaflet coaptation. The C-shaped transducer used previously to measure chordal tension was too big for tension measurement of multiple chordae and their branches. A new method is needed to measure chordal tension with minimum interference with chord and leaflet motion. The method was to extrapolate longitudinal chordal tension from transverse chordal fibril force measured by inserting a small elliptical AIFP4 sensor from MicroStrain Inc. (Williston, VT) through a chord. Sensitivity of the method has been tested with the sensor implanted in chordae, and error of the method has been estimated at various sensor deviation angles. Intact porcine and ovine hearts were used to measure mitral valve strut and marginal chordal tensions at static transmitral pressures of and under an in vitro condition. The results obtained from the AIFP4 sensor were similar to the results obtained previously by C-shaped transducers in the porcine mitral valves. The sensor output errors increased with the increase in sensor deviation angle in the chord at a peak systolic tension. Strut chordal tensions of four ovine mitral valves of Edwards ring size M 28 were at the transmitral pressure of . The tension of 18 porcine strut chordae of porcine mitral valves of Edwards ring size M 32 was at the transmitral pressures of . The tension of 22 anterior leaflet marginal chordae from porcine mitral valves of Edwards ring size M 32 was at the transmitral pressure of . A new method using an AIFP4 miniature force sensor to measure mitral valve chordal tension indirectly is successfully developed. This force sensor works well in measuring mitral valve chordal tension at an in vitro hydrostatic transmitral pressure. The size and simple fixation of the sensor make it favorable for chordal tension measurement of multiple chordae and their branches under in vitro or in vivo conditions with minimal interference with chordal geometry and dynamics.
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January 2009
Technical Briefs
A Novel Method to Measure Mitral Valve Chordal Tension
Zhaoming He, Ph.D.,
Zhaoming He, Ph.D.
Department of Mechanical Engineering,
e-mail: zhaoming.he@ttu.edu
Texas Tech University
, 7th Street and Boston Avenue, P.O. Box 41021, Lubbock, TX 79409
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Christopher Jowers
Christopher Jowers
Department of Mechanical Engineering,
Texas Tech University
, 7th Street and Boston Avenue, P.O. Box 41021, Lubbock, TX 79409
Search for other works by this author on:
Zhaoming He, Ph.D.
Department of Mechanical Engineering,
Texas Tech University
, 7th Street and Boston Avenue, P.O. Box 41021, Lubbock, TX 79409e-mail: zhaoming.he@ttu.edu
Christopher Jowers
Department of Mechanical Engineering,
Texas Tech University
, 7th Street and Boston Avenue, P.O. Box 41021, Lubbock, TX 79409J Biomech Eng. Jan 2009, 131(1): 014501 (4 pages)
Published Online: November 20, 2008
Article history
Received:
September 25, 2007
Revised:
September 16, 2008
Published:
November 20, 2008
Citation
He, Z., and Jowers, C. (November 20, 2008). "A Novel Method to Measure Mitral Valve Chordal Tension." ASME. J Biomech Eng. January 2009; 131(1): 014501. https://doi.org/10.1115/1.3005160
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