Characteristics and treatment strategies of mitral regurgitation associated with undifferentiated papillary muscle.

General Thoracic and Cardiovascular Surgery
Ichiro MatsumaruTomayoshi Hayashi

Abstract

In this report we review our experience of operations on mitral regurgitation associated with abnormal papillary muscles/chordae tendineae of the mitral valves and discussed the clinical characteristics, operative findings, and treatment strategies. Undifferentiated papillary muscle was defined as a hypoplastic chordae tendineae with anomalous formation of papillary muscles attached to the mitral valves directly. Consecutive 87 patients undergoing surgery for mitral regurgitation at our institution were reviewed and 6 of them had undifferentiated papillary muscle. The underlying mechanism of regurgitation was prolapse at the center of the anterior leaflet in 3 cases and tethering, a wide area of myxomatous degeneration, and annular dilatation in one case, respectively. Five patients underwent mitral valve plasty and 1 patient received replacement. Anomalous formation of chordae tendineae was corrected by resection and suture with transplantation at the tip of the leaflet to which abnormal chordae were attached in 2 cases, while resection and suture with chordal shortening was performed in 1 case, and chordal reconstruction using artificial chordae was employed in 2 cases. There was no operative death, and postoperative echocard...Continue Reading

References

May 1, 1994·Circulation·P MooreJ E Lock
Nov 1, 1995·The Annals of Thoracic Surgery·A F CarpentierD F Loulmet
Jul 1, 1997·The Journal of Thoracic and Cardiovascular Surgery·P W OosthoekA C Gittenberger-de Groot
Nov 1, 2005·The Journal of Thoracic and Cardiovascular Surgery·Tirone E DavidHarry Rakowski
Jan 24, 2008·General Thoracic and Cardiovascular Surgery·Mikihiko KudoShiro Iwanaga
Jun 18, 2010·The Journal of Thoracic and Cardiovascular Surgery·Giovanni StellinAlessandro Mazzucco

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Citations

Sep 28, 2020·The Annals of Thoracic Surgery·Masato MutsugaAkihiko Usui
Aug 14, 2021·Frontiers in Cardiovascular Medicine·Kunjing PangShoujun Li

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