Conventional aortic and bicaval cannulation is performed. The interatrial groove is dissected to improve exposure, however, one of the characteristics of Barlow's disease is the pliability of the tissues, hence valve exposure is usually excellent. Cardioplegia is given and the left atrium is incised and entered laterally. The mitral valve is exposed with a Cosgrove mitral retractor. Inspection is carried on as usual. If the diagnosis of Barlow's disease is confirmed and prolapse is more than 1 cm beyond the annular level, the edge-to-edge repair is indicated. In most cases of Barlow's disease, 4-0 polypropylene suture (double armed prolene SH-1) is usually appropriate, since leaflets are thick and redundant. A 5-0 polypropylene suture may be preferable in case of thin tissues. Pledgets are not necessary.