[Two cases of ruptured aneurysm of sinus of Valsalva into right atrium (Konno's type IV)].

Experience with surgery for ruptured aneurysm of sinus of Valsalva into right atrium (Konno's type IV) in two cases was reported. The first case is a 39-year-old male developing into congestive heart failure for 5 days after the onset that was suspected of "rupture's attack". In the second case of 33-year-old male the course was slow progressing and the onset could not be identified. Mitral valve prolapse was suspected previously because of his syncope attack and infectious endocarditis. Closure of the ruptured noncoronary sinus of Valsalva with mattress suture was undertaken on both cases through the right atrium. Cardiac murmur was disappeared postoperatively on the both cases, and MR was denied in the later case. Postoperative courses were uneventful.