Surgical Strategy for Reoperative Coronary Artery Bypass Grafting / 日本心臓血管外科学会雑誌

Though the number of reoperative coronary artery bypass grafting procedures (re-CABG) is increasing, the operative results are still inferior to primary CABG. In the present study, we analyzed results of our two different procedures for re-CABG and estimated predominance of the LAST-MIDCAB (off-pump left anterior small thoracotomy minimally invasive direct coronary artery bypass) procedure in selected patients. From 1999 to 2001, 25 patients underwent re-CABG. The age of patients ranged from 56 to 82 years (mean 70 years). Re-CABG was performed due to the occlusion of existing grafts in 14 cases, progressive disease of previously ungrafted vessels in 6 and anastomotic stenosis of previously grafted vessels in 5. We performed off-pump LAST-MIDCAB in 15 patients, on-pump CABG via a median sternotomy in 9 and on-pump LAST-CABG in 1 which was converted due to RV injury during a re-sternotomy. In the LAST-MIDCAB group, the left internal thoracic artery was chosen as a graft to the LAD in 10 patients, the right gastroepiploic artery in 4 and the saphenous vein in 1. The operation time of the LAST-MIDCAB group was significantly shorter than that of the on-pump CABG group. Blood transfusion was necessary for only one patient in the LAST-MIDCAB group. Although many postoperative complications occurred in the on-pump CABG group, no major postoperative complication was seen in the LAST-MIDCAB group except one patient who sufferred from lung fibrosis, which led to shortness of the postoperative hospital stay. We conclude that LAST-MIDCAB is an alternative way to reduce operative morbidity in selected re-CABG cases.

International Collaborative Study of the Effectiveness of Computer-Based Educational Materials for Clinical-Skills Training: Report of a Study at Kochi Medical School / 医学教育

The abundant computer-based materials for medical education developed in Europe and North America have found limited use in Japan. To remedy this situation, the usefulness of such educational materials for Japanese students should be clearly presented, because issues of language and cost are involved. For detailed evaluation of educational material, collaboration with the developing institution is necessary. Kochi Medical School participated in an international collaborative study proposed by the University of British Columbia to evaluate computer-based educational materials. The study evaluated computer-based educational materials for clinical-skills training (CyberPatient) developed at the University of British Columbia. Fourteen medical educational institutions from six countries participated in the study. Kochi Medical School's portion of the study was successfully performed in December 2001. However, we found four problems related to this collaborative study: dealing with foreign languages in educational materials, establishing rapid communication, flexibly coping with sudden changes in study design, and guaranteeing the coherence of the study design among collaborating institutions.

A Case of Sigmoid Colon to Skin Fistula Following Surgery for Abdominal Aortic Aneurysm / 日本心臓血管外科学会雑誌

We present a case of sigmoid colon to skin fistula following surgery for abdominal aortic aneurysm that was believed to have resulted from nonocclusive mesenteric ischemia involved in low cardiac output syndrome. A 65-year-old man underwent surgical treatment for an abdominal aortic aneurysm. Although the patient had operative risks of renal dysfunction and left ventricular dysfunction due to an old myocardial infarction, the abdominal aortic aneurysm was 6cm in diameter and threatened to rupture, thus prompting surgical removal. For the operation, the abdominal aorta was clamped above the renal arteries and the aneurysm was replaced with a Y-shaped prosthetic graft following the aneurysmectomy. Among the vessels supplying the sigmoid colon, both the inferior mesenteric artery and the left internal iliac artery had become obstructed and thus only the right internal iliac artery could be successfully reconstructed. The patient suffered from low cardiac output syndrome after surgery and subsequently experienced renal dysfunction, liver dysfunction and a disturbance of the peripheral circulation. On postoperative day number 7, the patient complained of watery diarrhea occurring several times a day and abdominal distension as a result of the ischemic colitis. On day number 16, the sigmoid colon to skin fistula developed. Oral intake was discontinued and nutritional support thereafter consisted of intravenous hyperalimentation. In addition, enteral nutrition using an elemental diet was begun. The fistula was successfully closed two weeks later and the patient recovered with no further complications.

A Case of Post-Transfusion Graft-versus-host Disease / 日本心臓血管外科学会雑誌

A 78-year-old man with obstruction of the right common femoral artery due to arteriosclerosis obliterans underwent successful amputation of his leg. On the first postoperative day he received transfusion of three units of preserved blood. He continued to recover until postoperative day 7, when he developed a high fever, erythroderma and diarrhea. His condition gradually deteriorated and on postoperative day 15 he demonstrated severe and progressive leukopenia and thrombocytopenia. Although he underwent intensive treatment he died on postoperative day 20. A skin biopsy specimen revealed evidence of post-transfusion graft-versus-host disease.

Pulmonary stenosis after arterial switch operation for complete transposition of the great arteries(TGA) / 日本心臓血管外科学会雑誌

Pulmonary stenosis is the most frequent problem after arterial switch operation for TGA. We experienced four cases of late severe pulmonary stenosis out of twelve patients. All four had supravalvular stenosis either at anastomotic site or at previously banded segment. One patient had associated valvular stenosis and another had bilateral branch stenosis. It is possible that valvular stenosis was due to retraction of equine pericardial patch and branch stenosis was due to overdistension. All four cases were successfully reoperated on 13∼39 months after switch operation. To prevent late pulmonary stenosis, we now alter technique of switch operation in two points. First, the great arteries are anastomosed with interrupted U-shaped sutures from outside of the vessels in whole circumference. Second, both coronary arteries are transferred with punched-out method to save tissue of Valsalva sinus, and the defects are closed with autologous pericardial patch.