Mitral Reoperation via Partial Sternotomy / 日本心臓血管外科学会雑誌

A conventional reoperation via full sternotomy approach is associated with a higher risk of heart injury compared with first time operations. We employ a minimally invasive cardiac surgery (MICS) for valve reoperations in order to minimize dissection of sternal adhesions. We evaluated MICS for mitral reoperation in this report. We retrospectively analyzed 20 patients (group P) who underwent mitral reoperation via partial lower hemisternotomy (PLH) from July 1997 through March 2002, and 13 patients (group F) who underwent mitral reoperation via full sternotomy from April 1990 through June 1997. All patients received mitral valve replacement in both groups. Concomitant Maze procedures were significantly more frequent in group P (group P: <i>n</i>=8, group F: <i>n</i>=1). Aortic cross clamp times were significantly longer in group P (group P: 110±5min, group F:87±11min). The blood loss during operations was significantly less in group P (group P: 666±100ml, group F: 2, 405±947ml). Postoperative ventilation time and the length of intensive care unit stay were significantly shorter in group P. In group P and F the occurrence of a heart injury associated with sternotomy was 0/20 (0%), 2/13 (15%) respectively. Hospital mortality was 0/20 (0%), 2/13 (15%) respectively. There were neither any hospital deaths nor any postoperative major complications in group P. We conclude that PLH for mitral reoperations could be performed safely and is an alternative approach for mitral reoperations.

A Case of Ascending Aorta Pseudoaneurysm due to a Freestyle-Valve Free-Wall Fistula after a Modified Bentall Procedure with the Button Technique / 日本心臓血管外科学会雑誌

We encountered a case of ascending aorta pseudoaneurysm due to a Freestyle-valve free-wall fistula after a modified Bentall procedure with the button technique. A 60-year-old man with Marfan's syndrome who contracted annuloaortic ectasia presented with the onset of Stanford A type acute aortic dissection 3 years ago. The patient underwent aortic root replacement with a Freestyle-valve and ascending and hemi-arch aortic replacement. Thirty-seven months after this operation the patient was re-operated because of pseudo-ascending aorta aneurysm. The cause of the pseudo-aneurysm was a fistula of the Freestyle-valve free-wall and the left coronary artety (LCA) ostial reconstruction component. The fistula was repaired by direct closure with pledgets. The patient was discharged from the hospital 24 days after the operation.

Dissected Abdominal Aortic Aneurysm in a 24-Year-Old Female-Minimally Invasive Right Retroperitoneal Approach- / 日本心臓血管外科学会雑誌

A 24-year-old woman with an abdominal aortic aneurysm (AAA) caused by mucoid medial degeneration of the aortic wall in the absence of Marfan syndrome is reported. She required a Y-shaped graft replacement of the abdominal aorta through a minimal incision and recovered successfully.

Minimally Invasive Cardiac Surgery (MICS) for Double Valve Replacement (DVR) / 日本心臓血管外科学会雑誌

Minimally invasive cardiac surgery (MICS) for treating valvular disease was introduced in our division in July 1997, and we have treated a total of 236 cases by July 2002. Among the various types of surgical treatment, there were 21 cases (M-group) of double valve replacement (DVR) to treat combined valvular disease. There had been 8 cases (F-group) of DVR by means of conventional full sternotomy during the period from January 1990 to June 1997, before the introduction of MICS. A comparison of the results of these surgical treatments yielded the following results. There were no differences in operation time and blood loss during the operations between the 2 groups, whereas the aortic cross clamp time and cardiopulmonary bypass time were significantly longer in the M-group than the F-group (M-group: 189±6 and 228±7min; F-group: 132±18 and 183±16min, respectively). There were significantly more cases of concomitant maze operation in the M-group than in the F-group. There were no differences in the durations of postoperative intubation or ICU stay. The days required from operation to starting walking were significantly shorter in the M-group compared to in the F-group (M-group: 2.4±0.2 days; F-group: 3.3±0.2 days), while there were no differences in the postoperative hospitalization periods. There were no major postoperative complications, and 1 case each there was 1 death in each group during the hospitalization period. Although the aortic cross clamp time and cardiopulmonary bypass time were longer in the M-group than in the F-group, the postoperative course and surgical outcome were good. So MICS for DVR was considered acceptable. In addition, MICS was thought to provide high patient satisfaction with regard to cosmesis or thoracic fixation, although early discharge from the hospital, which was possible in cases of single valve MICS, was not obtained.

Usefulness of Lower Ministernotomy in Aortic Valve Replacement (AVR) by Minimary Invasive Cardiac Surgery (MICS) / 日本心臓血管外科学会雑誌

Upper ministernotomy is frequently selected in aortic valve replacement by minimary invasive cardiac surgery. However, retrograde cardioplegia cannulae cannot be inserted to some sites. CT examinations in our department revealed that lower ministernotomy can be used for surgery of the aortic valve in many Japanese cases. The usefulness of 2 approaches was examined in 68 cases with aortic valve disease who received aortic valve replacement by minimary invasive cardiac surgery from January 1997 to March 2002: Those who received upper ministernotomy (U group) and those who received lower ministernotomy (L group). Retrograde cardioplegia is frequently used in aortic valve replacement for myocardial protection. Those in the L group showed effectiveness in myocardial protection and in securing the operation field except in cases who were switched to full sternotomy. In the L group, the MAZE operation was performed and no significant differences were observed in aortic cross-clamping time, artificial cardiorespiratory time, operation time, bleeding amount and other factors. Lower ministernotomy was more effective than upper ministernotomy in myocardial protection by retrograde cardioplegia and securing the operation field in aortic valve replacement by minimally invasive cardiac surgery.

Limited Incision through a Retroperitoneal Approach in Abdominal Aortic Surgery / 日本心臓血管外科学会雑誌

To reduce surgical invasion, we recently used a limited incision through a retroperitoneal approach in the abdominal aortic surgery. Between May 2001 and March 2002, 18 patients who had infrarenal aortic aneurysm, iliac aneurysm, or aortoiliac occlusive disease were surgically treated using a new approach at Dokkyo University Koshigaya Hospital. Although 1 patient with a short aortic neck had to be converted to conventional surgical incision, the remaining 17 patients were successfully treated with the limited incision (range, 6-10cm). Operative time and intraoperative blood loss were 275.2±62.9min and 968.5±473.8ml, respectively. None of these patients required homologous blood transfusion in the perioperative period. All patients were extubated in the operation room. Oral feeding and mobilization started on day 1.6±0.5 and 1.4±0.9, respectively. Furthermore, all patients were discharged home without serious complications such as postoperative ileus and perioperative death. These results show that the limited incision through a retroperitoneal approach is safe and effective in the abdominal aortic surgery. This technique maintains quality outcome while reducing surgical invasion.