Patterns of collateral arteries to the spinal cord after thoracoabdominal aortic aneurysm repair.

OBJECTIVES: To evaluate postoperative patterns of collateral arteries to the spinal cord during occlusion of the segmental arteries supplying the artery of Adamkiewicz (AKA). METHODS: Between April 2011 and December 2022, 179 patients underwent thoraco-abdominal aortic aneurysm repair; 141 had an identifiable AKA on preoperative multidetector computed tomography (MDCT) scans, 40 underwent thoraco-abdominal aortic aneurysm replacement (TAAR), and 101 underwent thoracic endovascular aortic repair (TEVAR). New postoperative collateral blood pathways invisible on preoperative contrast-enhanced computed tomography scans were identified in 42 patients (10 patients in TAAR vs 32 patients in TEVAR) who underwent preoperative and postoperative MDCT scanning for AKA identification. RESULTS: The thoracodorsal and segmental arteries were the main collateral pathways in both groups. Th9-initiated collaterals were the most common. Collaterals from the internal thoracic artery were observed in the TEVAR group but not in the TAAR group. One patient in the TEVAR group experienced postoperative paraparesis, which was not observed in the TAAR group. Postoperative paraplegia was more common in the non-Th9-origin group, but this difference was non-significant. CONCLUSIONS: Thoracodorsal and segmental arteries may be important collateral pathways after TEVAR and TAAR. For thoracodorsal arteries, preserving the thoracodorsal muscle during the approach would be crucial; for segmental arteries, minimizing the area to be replaced or covered would be paramount. An AKA not initiated at the Th9 level poses a high risk of postoperative paraplegia.

Twenty-year experience following aortic valve replacement in patients younger than 60 years of age.

OBJECTIVE: Reports on long-term outcomes of surgical aortic valve replacement (AVR) for patients aged < 60 years are scarce in Japan. Hence, we aimed to evaluate these outcomes in patients aged < 60 years. METHODS: Between March 2000 and December 2020, 1477 patients underwent aortic valve replacement. In total, 170 patients aged < 60 years who underwent aortic valve replacement were recruited. Patients aged < 18 years were excluded. Patient data collected from the operative records and follow-up assessments were reviewed. RESULTS: The mean age was 49 ± 9 years, and 64.1% of patients were male. One-hundred-and-fifty-two patients (89.4%) underwent aortic valve replacement with a mechanical valve and 18 (10.6%) with a bioprosthetic valve. The mean follow-up period was 8.1 ± 5.5 years. No operative mortality occurred, and in-hospital mortality occurred in one patient (0.6%). Ten late deaths occurred, with seven cardiac-related deaths. The overall survival rate was 95.4 ± 1.7%, 93.9 ± 2.3%, 90.6 ± 3.9%, and 73.2 ± 11.8% at 5, 10, 15, and 20 years, respectively. Freedom from major bleeding was 96.4 ± 1.6% at 5, 10, and 15 years, and 89.0 ± 7.3% at 20 years. Freedom from thromboembolic events was 98.7 ± 1.3%, 97.3 ± 1.9%, 90.5 ± 4.5%, and 79.0 ± 11.3% at 5, 10, 15, and 20 years, respectively. Freedom from valve-related reoperation was 99.4 ± 0.6% at 5 years, 97.8 ± 1.7% at 10 and 15 years, and 63.9 ± 14.5% at 20 years. CONCLUSIONS: Patients aged < 60 years undergoing aortic valve replacement with a high mechanical valve implantation rate had favorable long-term outcomes.

Thoracoabdominal aortic aneurysm repair based on pre- and postoperative evaluation of the artery of Adamkiewicz.

OBJECTIVES: The aim of this study was to evaluate our experience with thoraco-abdominal aortic aneurysm repair based on the pre- and postoperative evaluation of the artery of Adamkiewicz (AKA). METHODS: Between April 2017 and May 2021, 32 patients who underwent thoracoabdominal aortic repair underwent pre- and postoperative multidetector row computed tomography (MDCT) for AKA evaluation. Based on the identification of the AKA on preoperative MDCT, only 1 critical segmental artery was reattached to the AKA (CSA-AKA). Postoperative MDCT was used to evaluate the patency of the reattached CSA-AKA. RESULTS: Pre- and postoperative MDCT helped identify and visualize the AKA in all patients (100%). In 8 patients, alternative continuity to the AKA developed through collateral circulation. The total number of CSA-AKA with collateral circulation was 48 among the 32 cases; the number of reattached segmental arteries per case was 1.3 ± 0.9 (range, 0-4). The overall rate of patency of the reattached CSA-AKA was 53% (23/43). Three patients exhibited spinal cord injuries (paraplegia, 2; paraparesis, 1). In the 2 paraplegia cases exhibiting partial or complete occlusion of the reattached CSA-AKA, the development of collateral circulation was not visualized via postoperative MDCT. In the paraparesis case, postoperative MDCT helped visualize the development of collateral circulation to the CSA-AKA, resulting in full recovery at discharge. CONCLUSIONS: The study findings suggest that spinal cord injuries do not occur in the presence of a patent preoperatively identified CSA-AKA or the development of collateral circulation. Pre- and postoperative identification of collateral pathways to the AKA may help reveal paraplegia risk factors.

Ruptured Abdominal Aortic Aneurysm Repair Using Open Proximal Anastomosis Under Deep Hypothermic Circulatory Arrest.

Proximal aortic clamping under normothermia is generally adequate for operative repair of abdominal aortic rupture; however, the hypothermic circulatory arrest (HCA) technique is not as common. Proximal exposure and clamping are sometimes difficult due to the risk of bleeding, rerupture, and ischemia. We present a successful case of a ruptured abdominal aortic aneurysm (AAA) that was repaired using cardiopulmonary bypass with HCA. A 75-year-old man presented with sudden back pain and was diagnosed with a ruptured AAA using computed tomography. The aneurysm had a maximal diameter of 100 mm and protruded anteriorly just below the renal arteries. The rupture site was close to the renal arteries, and thus, there was a high risk of bleeding and shock during proximal exposure. Cardiopulmonary bypass was established by cannulation of the right axillary artery and right femoral vein, following which open laparotomy was performed. Proximal exposure and anastomosis could be safely performed using HCA. This cardiopulmonary bypass with HCA technique may be useful as a surgical strategy for ruptured juxta-renal AAAs.

[Valve Re-replacement after Aortic Valve Replacement with Starr-Edwards Ball Valve Forty-five Years Ago:Report of a Case].

The patient was a 67-year-old man. At 22 years of age, he underwent aortic valve replacement with Starr-Edwards ball valve. At 67 years of age, he complained of fatigue of the New York Heart Association (NYHA) class Ⅲ condition. He was diagnosed with mitral regurgitation, tricuspid regurgitation, ascending aortic aneurysm and chronic atrial fibrillation. Transthoracic and transesophageal echocardiograms showed a mobile, elongated echogenic mass attached to the valve cage and floating downstream. We performed Bentall procedure, ascending aortic replacement, mitral valve replacement, tricuspid annuloplasty and left atrial appendage closure. Explanted ball valve showed extensive cloth destruction and partial cloth tear. Mild pannus formation was observed beneath the valve. Despite 45 years after initial operation, significant valve dysfunction was not observed.

The rare case of a MitraClip device migrating into the left ventricular apex.

A 79-year-old man with atrial fibrillation and heart failure due to grade 4 + mitral valve regurgitation after coronary artery bypass underwent the MitraClip procedure using two clips. Three days after the procedure, chest radiographs indicated migration of one of the two clips into the left ventricle. He suffered from 3 + recurrent mitral regurgitation, tricuspid valve regurgitation. The echocardiogram and computed tomography scans indicated migration of the clip into the left ventricular apex; he underwent mitral valve replacement, removal of the migrated clip to prevent embolism, left atrial appendage closure, and tricuspid valve ring-annuloplasty. In the postoperative acute phase, embolism by detached and lost MitraClip device is possible, which can be difficult to remove.

Adult case of tetralogy of Fallot associated with atrioventricular septal defect.

The patient was a 28-year-old woman who was misdiagnosed with tetralogy of Fallot and straddling mitral valve after birth. She underwent a left modified Blalock-Taussig shunt at the age of 1 year. At age 28, she presented with fatigue and progressive cyanosis. Finally, she was diagnosed with tetralogy of Fallot and complete atrioventricular septal defect. To measure the exact biventricular volumes, we performed cardiac magnetic resonance imaging in addition to cardiac angiography and ensured adequate volume capacity. We eventually decided to perform biventricular repair. Her postoperative course was uneventful, and she returned to full-time work.

[Metastasis of Clear Cell Renal Cell Carcinoma to the Left Ventricle].

Cardiac metastasis from renal cell carcinoma (RCC) is relatively rare. It generally initiates from the right atrium with or without involvement of the inferior vena cava (IVC). Here, we report a case of metastasis of isolated clear cell RCC to the left ventricular( LV) papillary muscle. An 84-year-old male who had undergone renal resection due to RCC 19 years before, presented to our hospital with suspected LV tumor by echocardiography. The tumor was located near the posterior papillary muscle, with a size of 15×12 mm. The patient underwent resection of the LV tumor. Pathologically, the tumor was diagnosed as clear cell RCC. The postoperative course was stable, and he did not require any chemotherapy. Although there is no definite evidence of the mechanisms of metastasis, the tumor was supposed to metastasize lymphogeneously.

Chronic contained rupture of abdominal aortic aneurism complicated with aortic occlusion: a case report.

BACKGROUND: Chronic contained rupture is a subtype of an abdominal aortic aneurysm rupture. Its diagnosis is sometimes difficult due to lack of typical symptoms. We would like to report the challenge of diagnosing chronic contained rupture of abdominal aortic aneurysm with a retroperitoneal tumor. CASE PRESENTATION: A 60-year-old man reported perceived lower abdominal pain 7 months earlier that spontaneously remitted. A contrast-enhanced computed tomography (CT) indicated an abdominal aortic aneurysm and a mass lesion surrounding the abdominal aorta and iliac arteries. Fluorine-18-fluorodeoxyglucose positron emission tomography (FDG-PET) showed an increased accumulation of FDG in the margin of the lesion, indicating a retroperitoneal tumor. A CT-guided biopsy revealed only retroperitoneal fibrous tissue with chronic inflammation. We were thus unable to reach a definitive diagnosis. At 1 month after the initial examination, intermittent claudication was newly observed. A follow-up contrast-enhanced CT scan revealed abdominal aortic occlusion. Mass resection and bypass surgery were performed for diagnosis and treatment. Intraoperative and pathological findings led to the diagnosis of chronic contained rupture of an abdominal aortic aneurysm. The patient was discharged 19 days after surgery. CONCLUSION: The mass peripheral to the abdominal aorta should be considered the possibility not only of tumor but also of chronic contained rupture of an abdominal aortic aneurysm.

[Valve Replacement for Infective Endocarditis of Pulmonary Valve;Report of a Case].

Generally, infective endocarditis is found at the left side of the heart. The right side infective endocaritis accounts for only 5~10% of all cases of infective endocarditis. The right side infective endocarditis occurs especially among drug users employing intravenous injection. A typical site of infection is the tricupid valve, and isolated pulmonary valve involvement is rare. It is assumed that its rarity is due to the low pressure gradients within the right heart, the low prevalence of valve disease, and the lower oxygen content of the venous blood. We describe a case of isolated pulmonary valve endocarditis requiring valve replacement. Antibiotic therapy was conducted for 4 weeks before surgery and 2 weeks after surgery. Clinical course was favorable and the patent was discharged home 18 days after surgery.