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Gerhard Ziemer
Hellmut Oelert
Hans G. Borst
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Ann Thorac Surg 1982;33:391-395
© 1982 The Society of Thoracic Surgeons

Articles

Malfunction of a St. Jude Medical Heart Valve in Mitral Position

Gerhard Ziemer, M.D.*, Ingrid Luhmer, M.D., Hellmut Oelert, M.D., Hans G. Borst, M.D.

From the Divisions of Thoracic and Cardiovascular Surgery, and Paediatric Cardiology, Hannover Medical School, Hannover, Federal Republic of Germany.

Accepted for publication September 10, 1981.

* Address reprint requests to Dr. Ziemer, Klinik für Thorax-, Herz- und Gefäßchirurgie, Zentrum Chirurgie, Medizinische Hochschule Hannover, Karl-Wiechert-Allee 9, D-3000 Hannover 61, Federal Republic of Germany.

Early postoperative intermittent malfunction in a St. Jude mitral valve prosthesis is described. The patient underwent reoperation and had an uneventful recovery. After explantation, the prosthesis underwent laboratory examination. The findings included a minimal disproportion between leaflets and valve ring causing intermittent inhibition of leaflet motion. The unpredictable irregularity of the malfunction phenomenon in vivo, confirmed by laboratory investigations, is explained as a result of a changing myocardial tension status sufficient to alter the ring to leaflet proportion of the valve in either direction.




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[Abstract] [Full Text]


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