Publications by authors named "Yasuhide Okawa"

Background: Bilateral internal thoracic artery (ITA) grafting is associated with improved long-term outcomes; however, the appropriate graft configuration remains controversial. We compared the long-term outcomes of different graft configurations.

Methods: Between 2009 and 2015, 1171 patients underwent isolated bilateral ITA grafting for left-sided complete revascularization at 4 Japanese cardiac surgery centers: underwent in situ left ITA to the left anterior descending artery plus in situ right ITA to the left circumflex artery (LR group, n = 278), in situ right ITA to the left anterior descending artery plus in situ left ITA to the left circumflex artery (RL group, n = 665), and in situ left ITA to the left anterior descending artery plus free right ITA to the left circumflex artery (free group, n = 228).

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  • The study investigated the relationship between varicose veins and edema by measuring the extracellular water ratio (E/T) in patients using bioelectrical impedance analysis before and after surgery.
  • A total of 120 patients had their E/T values measured, with edema defined as an E/T of 0.390 or higher; results showed that both treated and untreated legs showed signs of edema pre-surgery.
  • Post-surgery, the E/T values decreased significantly across the body, indicating that varicose vein treatment effectively reduced edema in the affected leg and overall.
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A ruptured Kommerell diverticulum is extremely rare. This is the first report of thoracic endovascular aortic repair without subclavian revascularization of a ruptured Kommerell diverticulum with a right-sided aortic arch. However, decisions regarding subclavian revascularization should be individualized based on the patient's anatomy and clinical presentation.

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Both perivalvular leakage and kinked prosthetic graft may cause hemolysis. A 72-year-old man was refereed to our hospital because of hemolytic anemia. He has past histories of total aortic arch replacement and repeat aortic valve replacement for aortic aneurysm and prosthetic valve endocarditis.

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Background: Acute type A aortic dissection is treated with an emergency procedure that uses ascending aortic replacement (AAR). However, to avoid a residual dissected aorta with a false lumen, total arch replacement (TAR) is required. The frozen elephant trunk (FET) technique is a promising surgical approach that promotes false lumen obliteration in a single step.

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Surgical approaches of minimally invasive direct coronary artery bypass and left atrial appendage exclusion are different, and issues may arise in cases of concomitant surgery. Moreover, the safety of concomitant procedures has not been established. A man in his 80s with a history of stroke required minimally invasive coronary artery bypass grafting and left atrial appendage closure for the stenosis of the left anterior descending artery and atrial fibrillation.

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Recent studies showed that preoperative functional assessment with fractional flow reserve (FFR) could predict a long-term patency of arterial bypass grafts in patients with coronary artery bypass grafting (CABG). Quantitative flow ratio (QFR) is a novel angiography-based approach to estimate FFR. This study aimed to investigate whether preoperative QFR could discriminate arterial bypass function at 1 year after surgery.

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Leriche syndrome usually occurs when atherosclerotic obstructions result in luminal narrowing of the abdominal aorta or iliac arteries and leads to thrombosis; it rarely causes heart or renal failure. We report the case of a 58-year-old Asian man with heart and renal failure as the dominant clinical manifestations of renovascular hypertension caused by Leriche syndrome. We performed an aorto-bifemoral bypass and unilateral renal artery stenting.

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Fenestration of the aortic valve cusps rarely causes aortic regurgitation. A 54-year-old woman was diagnosed with aortic regurgitation secondary to a ruptured fibrous strand in a fenestrated aortic valve cusp. Diastolic murmur was pointed out during health checkup five months earlier, and transthoracic echocardiography revealed severe aortic valve regurgitation with a mobile mass attached to the aortic valve cusp.

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Although minimally invasive direct coronary artery bypass (MIDCAB) is a less invasive procedure, internal thoracic artery (ITA) harvesting is difficult. A 65-year-old woman was advised to undergo MIDCAB for recurrent in-stent restenosis. We harvested the ITA using three-dimensional endoscopy without robotics and determined the scope position using enhanced computed tomography.

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Background And Aim: Ischemic heart disease is the leading cause of death around the world. Coronary artery bypass grafting offers efficient surgical revascularization for ischemic disease. Both on- or off-pump coronary artery bypass methods provide promising results to octogenarians, once complete vascularization is achieved.

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  • Hybrid coronary revascularization (HCR) combines coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI) to treat complex multivessel coronary disease more effectively.
  • A study involving 54 patients across six Japanese institutes collected data on the safety and outcomes of HCR, with a focus on major adverse cardiovascular events (MACE) over one year.
  • Results showed a low incidence of MACE (8.2%) and no significant complications like myocardial infarction or mortality in the first year, indicating HCR’s safety and feasibility, but further research is necessary for validation.
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We report a case of stent graft occlusion, severe lower extremity ischemia, and ruptured abdominal aortic aneurysm due to type B acute aortic dissection 3 years after endovascular aneurysm repair. He admitted our hospital because of abrupt back pain and dysesthesia of bilateral lower limb. Contrast-enhanced computed tomography (CT) scan showed type B acute aortic dissection and occlusion of the stent graft due to dynamic compression by the false lumen.

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  • The coexistence of Leriche syndrome and a thoracoabdominal aortic aneurysm presents unique surgical challenges due to limited anastomosis options.
  • A 56-year-old patient with a history of significant heart surgeries had an occluded abdominal aorta, but collateral blood flow allowed for successful aneurysm repair.
  • Using a quadrifurcated graft enabled effective repair without the need for distal anastomoses, highlighting a viable surgical strategy in such complex cases.
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A modified transaxillary approach for aortic valve disease to obtain the same exposure as the anterior minithoracotomy approach and to preserve the pectoralis major muscle is presented. When the patient's right shoulder is adducted horizontally, or the right arm is flexed anteriorly 90 degrees and adducted to the left, the right axilla comes close to the chest midline. That means that a right anterior thoracotomy can be made through the right axilla when the arm position is adjusted appropriately.

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  • A study on uncomplicated type B acute aortic dissection (UTBAAD) found that traditional medical treatments often lead to complications from prolonged bed rest.
  • * The researchers implemented a 'fast-track' rehabilitation program that included early mobility and reduced bed rest, leading to quicker patient recovery and fewer complications, such as pneumonia.
  • * Results showed that patients in the fast-track group had shorter hospital stays, lower medical costs, and no increase in adverse aortic events compared to those receiving standard treatment.
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Introduction: A case of malperfusion in which the patient presented with aortic dissection is presented.

Presentation Of Case: A 69-year-old man with an acute aortic dissection (Stanford type B) had lower limb ischemia. Axillary-femoral bypass was performed, and his lower limb ischemia improved.

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An 88-year-old man was admitted with general fatigue. Computed tomography (CT) showed a descending aortic aneurysm. The laboratory data indicated severe infection.

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  • The study aimed to compare the effectiveness of two different grafting techniques using bilateral internal thoracic arteries in patients undergoing coronary artery bypass surgery.
  • A total of 877 patients were reviewed, with graft patency rates found to be similar for both techniques after two years, although certain factors influenced graft failure.
  • Results indicated that RITA-to-LAD grafting showed better mid-term outcomes and a lower incidence of future cardiac events compared to LITA-to-LAD grafting.
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An 80-year-old woman was incidentally found to have a cardiac tumor on the aortic valve by echocardiography. Papillary fibroelastoma(PFE) was strongly suspected, and urgent operation was performed to prevent embolism. Two tumors were identified arising from the left and right cusps with wide stalks, and aortic valve replacement was performed.

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Bilateral partial anomalous venous connections are rare. Here, we present a patient who underwent the modified Warden procedure to reroute the superior vena cava with the partial anomalous veins to the left atrium and reconstruct the innominate vein and superior vena cava with a polytetrafluoroethylene conduit to the right atrial appendage. The procedure was successfully performed without using foreign materials in the pulmonary venous route.

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  • - A study was conducted with cardiovascular surgery patients to assess the impact of neuromuscular electrical stimulation on muscle breakdown and physical performance, comparing it to standard post-surgery mobilization.
  • - Patients received the neuromuscular electrical stimulation on their legs eight times before and after surgery, while physical therapists measured various physical functions without knowing which group the patients were in.
  • - Results showed no significant differences in muscle breakdown or physical function between the two groups, indicating that more research is needed to understand the effectiveness and proper usage of this electrical stimulation technique.
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