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PubMed · 2185800

Improved mitral valve replacement.

A Bernhard·H H Sievers·U Nellesen·I Maurer
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Abstract

We describe a simple, reproducible technique of achieving more normal left ventricular function after mitral valve replacement. Polytetrafluoroethylene (PTFE) sutures are used as chordae tendineae to restore the integrity between the mechanical valve and papillary muscles and thus the left ventricular wall.

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Chordae TendineaeHeart Valve ProsthesisHumansMitral ValvePolytetrafluoroethyleneProsthesis DesignSuture TechniquesJournal Article

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A Bernhard, H H Sievers, U Nellesen, I Maurer. 1990. Improved mitral valve replacement.. https://doi.org/10.1016/1010-7940(90)90010-w

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Long-term pathological changes of expanded polytetrafluoroethylene (ePTFE) suture in the human heart.

Expanded PTFE (ePTFE) sutures have been used widely as a mitral chordal substitute. We present a structural analysis of ePTFE sutures implanted as artificial chordae for 7.5 years and 8.6 years in patients with mitral regurgitation. No calcification was found either macroscopically or microscopically, and the ePTFE suture retained its normal flexibility. The suture was totally encapsulated with host tissues composed of dense fibrous tissue covered with endothelial cells.

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Rupture mechanics of mitral valve chordae have been difficult to elucidate because most surgical repairs and pathological examinations are performed after the rupture. In an excised anterior leaflet from a fibrotic mitral valve, chordae were observed in an initial phase of rupture. Microscopic sections showed that thinned, nearly ruptured chordal segments were actually chordal cores, containing highly aligned collagen fibers. The outer sheath of elastic fibers, disorganized circumferentially oriented collagen fibers, and endothelial cells that normally surrounds the collagen core apparently had retracted to the extreme ends of the thinned segment, resulting in a bulbous shape, as noted in the chordal rupture literature. In conclusion, these new observations lead us to propose that the rupture of mitral valve chordae is not spontaneous, but may occur over time. The failure of the outer sheath may represent the first phase in a slow, two-part process leading to eventual chordal rupture.

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