ABSTRACT
An 81-year-old man underwent aortic valve replacement with a 21-mm Medtronic Mosaic porcine bioprosthesis for the treatment of bicuspid aortic valve stenosis. In addition to the appearance of chest discomfort on effort and a new diastolic murmur, echocardiography performed 2 years and 3 months after the surgery showed a high pressure gradient across the bioprosthetic valve and a reduction in the valve orifice area. Prosthetic valve dysfunction was diagnosed. During a repeat operation, 2 large tears on the left cusp and a subvalvular overgrown abundant pannus were observed, and the bioprosthetic valve was replaced with a 19-mm On-X mechanical heart valve. On analysis of the explant bioprosthesis, the right non-coronary stent post was bent outwards by approximately 9°, it compressed the left cusp by pulling the left right and left non-coronary stent posts closer together, thus altering the leaflet geometry and function. We speculated that pannus formation had resulted from turbulent blood flow caused by impaired or altered leaflet function. The 2 large tears appeared to be the result of contact with the bias cloth secondary to the stent distortion.
ABSTRACT
Percutaneous transcatheter closure of ostium secundum atrial septal defect (ASD) has become an alternative to conventional open surgical repair. Cardiac perforation is a rare complication after transcatheter closure of ASD by an Amplatzer Septal Occluder (ASO). We present a patient with hemodynamic collapse secondary to cardiac perforation occurring 5 months after placement of the ASO and discuss the complications of this device. A 14-year-old girl underwent transcatheter closure of ASD by the ASO in our institution. Transesophageal echocardiography showed ASD sized 17.4×15.0mm, with no aortic rim. The placement of the ASO was performed without complications, but 5 months after the procedure she started to complain of chest pain and subsequent syncope. She was brought to a local emergency department. Transthoracic echocardiography showed an important cardiac effusion with signs of cardiac tamponade. Emergency pericardial drainage was performed under echocardiographic control from the subxiphoidal region. Once she was hemodynamically stabilized, the patient was transferred to our institution immediately for the necessary emergency surgical procedure. The operation was performed through a median sternotomy and the bleeding source was identified. The left-side of the ASO disc had cut through the roof of the left atrium between the superior vena cava and the aortic root, creating a 5-mm perforation. There was another perforation at the aortic root in the region of the non-coronary sinus of Valsalva, approximately 5 mm. The metallic rim of the ASO could be easily seen protruding through the roof of the left atrium. Cardiopulmonary bypass was established and cardiac arrest induced. After opening the right atrium we found the ASO, which was positioned well. The ASO was removed and the perforations of the aortic root and the left atrium were closed with 5-0 polypropylene directly. Then the ASD was closed using an autopericardial patch. The patient was weaned off bypass without difficulty. The postoperative course of the patient was uneventful and free of neurologic events. Finally, we conclude that patients with an aortic rim defect may be at higher risk for device perforation. Such a patient should be carefully followed up by echocardiography.
ABSTRACT
We experienced 26 cases of free internal mammary artery (IMA) grafting for coronary artery bypass (CABG) during past 44 months. There were 3, 6 distal anastomoses per patient and 1.6 distal anastomoses per patient were performed with free IMA. The early mortality rate (within 1 month after surgery) was 3.8%. The surgical complications were 0 in mediastintis requiring operation, 0 in reoperation for bleeding and 1; phrenic nerve paralysis with respiratory dysfunction, the patency rate at 1 month after surgery were 97.2% in free IMA and were 96.1% in <i>in-situ</i> IMA. Conclusion was as followed that the use of free IMA for CABG provided excellent result in early period and we would anticipate to expand the use of IMA.