Publications by authors named "Gembu Yamaura"

Background: To determine the optimal timing of thoracic endovascular aortic repair (TEVAR) for acute type B aortic dissection (TBAD), we investigated the relationship between the timing of TEVAR after onset and late aortic remodeling.

Methods: Between March 2015 and August 2020, 48 patients with TBAD (39 men [81.2%]; aged 61.

View Article and Find Full Text PDF

Objectives: To investigate the midterm results after zone 0 arch repair with frozen elephant trunks for acute type A aortic dissection.

Methods: Between October 2014 and April 2021, 196 patients underwent zone 0 arch repair with frozen elephant trunks for acute type A aortic dissection. The true lumen area, aortic lumen area, and false lumen status were assessed at four aortic levels, the proximal and distal descending thoracic aorta (level A and level B, respectively), celiac artery branching (level C), and terminal aorta (level D).

View Article and Find Full Text PDF

Background: Left atrial dissection is a rare complication of cardiac surgery, most commonly associated with mitral valve surgery. Herein, we report on the successful conservative treatment of left atrial dissection while avoiding anticoagulation therapy.

Case Presentation: A 64-year-old man developed left atrial dissection during operation for acute type A aortic dissection, most likely due to retrograde cardioplegia cannulation.

View Article and Find Full Text PDF

Aortic and arterial calcification is a complication of advanced atherosclerosis and is a critical intraoperative issue that can reduce the ability to achieve safe and adequate access for stent graft introduction. Different vascular access sites are used to deliver stent grafts when a standard transfemoral or iliac access is not feasible. We report a challenging case of a direct transabdominal aortic thoracic endovascular aortic repair for a thoracic aortic aneurysm complicated with severe aortic and arterial calcification, in which the noncalcified area of the infrarenal abdominal aorta was extremely limited.

View Article and Find Full Text PDF

In patients with a congenitally corrected transposition of the great arteries (ccTGA), the regurgitation of the systemic atrioventricular valve (SAVV) increases and anatomical right ventricular (ARV) dysfunction often progressively develops. A low systemic ventricular ejection fraction( SVEF) is a risk factor for mortality. However, in patients with a low ejection fraction of ARV, it is unclear how to best perform valve replacement for patients with regurgitation of SAVV.

View Article and Find Full Text PDF

We herein report a case of thoracic endovascular aortic repair( TEVAR) for chronic aortic dissection with an aberrant left vertebral artery( LVA) originating from the aortic arch. A 51-year-old man with a medical history of Stanford type B acute aortic dissection 2 years ago was transferred to our institution for the treatment of an aortic expansion. Computed tomography showed a large entry just distal to the takeoff of the left subclavian artery and a dilated dissected thoracic aorta.

View Article and Find Full Text PDF

Objective: The aim of this study was to investigate the effect of frozen elephant trunk deployment from the zone 0 aorta to the descending aorta on early and midterm postoperative results in patients with acute type A aortic dissection.

Methods: Between October 2014 and April 2018, 108 patients underwent a combined strategy of frozen elephant trunk deployment, ascending aortic replacement, and arch vessel reconstruction ("zone 0 arch repair" strategy) for acute type A aortic dissection (excluding DeBakey type II). Of the 108 patients, 32 (29.

View Article and Find Full Text PDF

The patient, a 55-year-old female Jehovah's Witness who had suffered type B aortic dissection since the age of 53 years, presented with enlargement of the false lumen in the distal aortic arch and was subsequently admitted to our hospital. While hospitalized, her enlarged false lumen ruptured and she underwent replacement of the distal aortic arch and descending thoracic aorta without blood transfusion. Blood conservation strategies for this patient included the following: 1) meticulous hemostasis when incising muscle or soft tissue, 2) minimal use of gauze and discard suckers, 3) exclusive use of a cell salvage device "from skin to skin," 4) low-prime cardiopulmonary bypass, 5) minimal laboratory blood sampling, and 6) preoperative and postoperative erythropoietin treatment.

View Article and Find Full Text PDF

Acute aortic occlusion is a rare but catastrophic pathology with high mortality even after revascularization. We describe four patients who underwent thrombectomy or bypass surgery for acute aortic occlusion with concomitant internal iliac artery occlusion. Two patients (82- and 75-year-old men), who had insufficient reperfusion of bilateral internal iliac arteries after treatment (thrombectomy alone and axillobifemoral bypass, respectively), died on postoperative day three of uncontrollable hyperkalemia and multiple organ failure, respectively (mortality: 50%).

View Article and Find Full Text PDF

Persistent sciatic artery (PSA) is a rare congenital vascular malformation. In this article, we have described the case of a 66-year-old woman presenting with a pulsatile mass in the left buttock and bilateral lower limb ischemia, who underwent surgical therapy. Preoperative computed tomography scanning showed a left thrombosed PSA aneurysm (PSAA) with concomitant occlusion of bilateral iliac, bilateral common femoral, and left popliteal arteries.

View Article and Find Full Text PDF

An 84-year-old woman with a history of surgery for cholangiocarcinoma presented to Akita University Hospital with severe right lower abdominal pain, respiratory distress, and hypotension. Computed tomography scanning revealed a ruptured right common iliac artery aneurysm with a massive right retroperitoneal hematoma and a right internal iliac artery aneurysm. Under the bilateral retroperitoneal approach, we preformed an in-situ repair of an aneurysm rupture from the aorta to the left common and right external iliac arteries using a bifurcated knitted Dacron graft, and then we ligated the right internal iliac artery.

View Article and Find Full Text PDF

Background: Rupture of an iliac artery aneurysm is rare but could be catastrophic unless it is treated with an appropriate strategy. We reviewed our 10-year institutional experience in treating iliac artery aneurysms to elucidate the effectiveness of open surgical repair strategies for ruptured iliac artery aneurysms in terms of short- and long-term postoperative results.

Methods: A total of 26 patients (men/women = 22/4), with a mean age of 72 years, underwent open repair of iliac artery aneurysm with or without rupture (unruptured/ruptured = 15/11) between January 2001 and April 2010.

View Article and Find Full Text PDF

We describe a 74-year-old male who underwent open stent repair for an infrarenal abdominal aortic aneurysm with a severely calcified aortic neck. The stent graft was constructed by covering a 50-mm long Gianturco Z stent (diameter: 20 mm) with a Dacron prosthesis (diameter: 20 mm). The stented Dacron graft was inserted into the calcified aortic neck, was then sutured to the trimmed aneurysmal wall, and was anastomosed to a bifurcated prosthesis.

View Article and Find Full Text PDF

We describe a patient with aortic occlusion due to false-lumen expansion after repair of abdominal aortic rupture in acute type B aortic dissection. A 70-year-old man presented to a nearby hospital with severe lower back pain, and was subsequently referred to our hospital with a diagnosis of abdominal aortic rupture. Computed tomography scanning on admission revealed type B aortic dissection with concomitant false-lumen rupture at the level of pre-existing infrarenal abdominal aortic aneurysm.

View Article and Find Full Text PDF

We describe a rare case of an arteriosclerotic aneurysm in the right-sided descending thoracic aorta with a left-sided aortic arch and concomitant aberrant right subclavian artery. A 76-year-old woman, who was found to have an aneurysm of the right-sided descending thoracic aorta, was referred to our hospital for surgical treatment. Contrast computed tomography scan revealed a left-sided aortic arch with an aberrant right subclavian artery, a descending thoracic aorta passing downward behind the esophagus, and an aneurysm of the right-sided and distal (level between the 8th and 10th vertebral bodies) descending thoracic aorta.

View Article and Find Full Text PDF

A 78-year-old woman, who had a history of abdominoperineal resection with the associated left-side stoma for rectal cancer, was diagnosed with an infrarenal abdominal aortic aneurysm involving both common and right internal iliac arteries. She underwent in situ graft (bifurcated Dacron) replacement through a right retroperitoneal approach because of limited accessibility to the aorta and iliac arteries due to the left-side stoma. The distal anastomosis of the bifurcated graft was placed to the right external iliac artery and left femoral artery, and the left common iliac artery was excluded by ligating the branching arteries.

View Article and Find Full Text PDF

A 56-year-old man with a painful, progressively enlarging pulsatile mass in the bilateral popliteal fossae was diagnosed with a bilateral popliteal artery aneurysm (PAA) and referred to our hospital to undergo surgical therapy. Computed tomographic scanning demonstrated a large, middle-type PAA with a rich mural thrombus in the bilateral popliteal arteries. Following aneurysm exclusion posteriorly, the patient underwent bypass surgery using a ringed polytetrafluoroethylene graft bilaterally.

View Article and Find Full Text PDF