Total Arch Replacement for Acute Type A Aortic Dissection 5 Years after Aortic Valve-Sparing Operation in a 14-Year-Old Boy with Loeys-Dietz Syndrome / 日本心臓血管外科学会雑誌

A 14-year-old boy who underwent aortic valve-sparing operation for annuloaortic ectasia at the age of 9 was referred to our service with a diagnosis of acute type A aortic dissection. Emergency total arch replacement with the elephant trunk technique was done successfully and the postoperative course was uneventful. However, computed tomography (CT) 2 weeks after the operation showed a new dissection and enlargement in left subclavian artery and folded elephant trunk. Dilatation in coronary buttons were also seen since the time of surgery. No residual dissection was found in the aorta. Careful follow up is necessary for this case due to multiple aneurysmal changes and a new dissection lesion in a short period. Loeys-Dietz syndrome (LDS) is characterized by vascular findings (aortic aneurysm and dissection) and skeletal manifestations. Due to aortic dissection occurring in smaller diameter aortas in LDS patients than in Marfan syndrome, early and aggressive surgery is recommended for patients with LDS.

Successful Treatment of Prosthetic Graft Infection after Descending Thoracic Aortic Reconstruction / 日本心臓血管外科学会雑誌

Thoracic graft infection is a serious complication with high mortality. We report a case of successful treatment of graft infection after descending thoracic aortic reconstruction. A 69-year-old woman underwent surgery for impending rupture of descending thoracic aneurysm. The aneurysm was replaced with prosthetic graft (Hemashield^®). She had a high fever on the 8th postoperative day (POD). We started antibiotic treatment, but her skin broke out in a rash shortly after the therapy because of drug allergy. We stopped treatment with all drugs on the 25th POD. She left our hospital on the 98 POD, but was readmitted 5 months after the operation because of fever. A CT scan and Gallium scintigraphy demonstrated fluid and air collection around the graft and <i>Staphylococcus epidermidis </i>was detected from the culture fluid of her blood. Because of the difficulty in replacing infected grafts, sensitive antibiotics to the pathogen was administered. Inflammatory reactions improved and her general condition was stabilized. On 39 days after re-admission, she was discharged. The patient is now asymptomatic, 14 months after the operation.

A Case of Coronary Artery Spasm in the Perioperative Period of Off-Pump Coronary Artery Bypass Grafting after Drug-Eluting Stent Implantation / 日本心臓血管外科学会雑誌

In 2005, a 64 year-old man underwent implantation of a sirolimus-eluting stent at another hospital for the treatment of severe stenosis of the right coronary artery (RCA) that caused unstable angina pectoris affecting the inferior cardiac wall. He was subsequently admitted to our hospital because of recurrent angina. Diagnostic coronary angiography, performed in November 2006, revealed 75% stenosis of the left main trunk and 99% stenosis of the left circumflex artery. We planned to perform off-pump coronary artery bypass grafting on May 6, 2007. Ticlopidine and aspirin were discontinued 14 days and 1 day before the operation, respectively. We then started continuous intravenous heparin administration. During the operation, the right internal mammary artery was grafted to the left anterior descending artery, and after rotation of the heart in order to graft to the circumflex artery, hypotension and ST elevation in electrode II occurred. The left internal mammary artery was grafted to the left circumflex artery under the support of intra-aortic balloon pumping, but the ST elevation did not normalize. Therefore, an extracorporeal cardiopulmonary bypass was started. Despite the coronary recanalization, the ST elevation in electrode II did not recover. Because of thrombosis of the drug-eluting stent, an aorto-coronary bypass graft to the RCA was performed with a saphenous vein graft. There was no proximal blood flow at the RCA incision. Therefore, we perfused the RCA via a shunt tube from the cardiopulmonary bypass, and subsequently the ST change normalized. However, ST elevation recurred after the operation. An emergency angiography performed immediately postoperatively revealed a patent saphenous vein graft and drug-eluting stent, and spastic change in the RCA distal from drug-eluting stent. After the initiation of a continuous intravenous drip of nicorandil, hypotension and the ST change recovered. Attention to coronary artery spasm after drug-eluting stent implantation is important.

Acute Type A Aortic Dissection Complicated with Acute Myocardial Infarction in a Case with an Aberrant Right Coronary Artery / 日本心臓血管外科学会雑誌

Acute aortic dissection complicated with acute myocardial infarction in a case of 61-year-old woman with an aberrant right coronary artery was successfully treated by emergency operation fore type A acute aortic dissection. However, cardiogenic shock and bradycardia occurred after induction of anesthesia due to right ventricle myocardial ischemia. Cardiopulmonary bypass was established quickly and deep hypothermia was induced. We also perfused the right coronary artery with an external shunt tube to prevent the progression of the right ventricular infarction. The right coronary artery, which originated above the left coronary sinus, was dissected totally. We performed ascending and aortic arch replacement and coronary artery bypass grafting with a saphenous vein graft to the right coronary artery under hypothermic circulatory arrest. She had no major reduction of cardiac function. Although it was a rare combination, aberrant right coronary artery was vulnerable to myocardial ischemia associated with acute type A dissection. The external coronary shunt tube was useful for this type of myocardial ischemia.