Mitral valve (MV) repair has become the surgical treatment of choice for myocardial infarction (MI). The prolapse of the P2 segment of the MV (P2) has been corrected, with excellent long-term results, via leaflet resection followed by both annulus placation and sliding leaflet plasty. Since the demonstration of the durability of expanded polytetrafluoroethylene (ePTFE) (Gore-Tex) sutures for MV repair, the implantation of ePTFE neochordae has become a widely accepted approach for the correction of MV prolapse. Because degenerative myocardial infarction is often due to the prolapse of P2, many corrective techniques have been described. The prolapse of the P3 segment of the MV (P3) is less frequent than that of P2; its correction, however, is more difficult because of the anatomical involvement of the posterior commissure.
Kassem S. Repair of the Isolated Mitral Valve P3 by "Resect-and-Respect" Combination. J Tehran Heart Cent 2018 Apr;13(2):101-102.