Atsushi Yamaguchi

Jichi Medical University, Totigi, Tochigi, Japan

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Publications (147)148.97 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Both left ventricular assist device and left ventricular reconstruction are treatment choices for severe heart failure conditions. Our institution performed a left ventricular assist device installation following a left ventricular reconstruction procedure on a 42-year-old male patient who presented with dilated cardiomyopathy and low cardiac output syndrome. A mitral valve plasty was used to correct the acute mitral valve regurgitation and we performed a Nipro extra-corporeal left ventricular assist device installation on post-operative day 14. Due to the left ventricular reconstruction that the patient had in a previous operation, we needed to attach an apical cuff on posterior apex, insert the inflow cannula with a large curve, and shift the skin insertion site laterally to the left. We assessed the angle between the cardiac longitudinal axis and the inflow cannula using computed tomography. The patient did not complain of any subjective symptoms of heart failure. Although Nipro extra-corporeal left ventricular assist device installation after left ventricular reconstruction has several difficulties historically, we have experienced a successful case.
    Journal of Artificial Organs 05/2015; DOI:10.1007/s10047-015-0837-x · 1.39 Impact Factor
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    ABSTRACT: Saphenous vein graft (SVG) pseudoaneurysms are rare complications following coronary bypass graft surgery. A 46-year-old man presented with streptococcal infectious endocarditis and needed sequential operations for aortic root reconstruction. Shortly after the surgeries, a composite SVG on the right coronary artery developed a ruptured pseudoaneurysm, which was successfully treated using covered stents.
    04/2015; DOI:10.1007/s12928-015-0332-6
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    ABSTRACT: A 71-year-old woman presented with heart failure due to aortic and mitral valve regurgitation. She had developed midiastinitis and graft infection, 15 months before, following replacement of the ascending aorta for acute aortic dissection. Omentum flap operation had been performed and the infection had been controlled. This time, she underwent re-thoracotomy, and replacement of ascending aorta, aortic valve replacement and mitral valve plasty were performed. The omenal tissue was exfoliated without any damage to the heart or the great vessels by using an ultrasonic scalpel. As the omental tissue was viable, it was placed back in the mediastinal space.
    Kyobu geka. The Japanese journal of thoracic surgery 02/2015; 68(2):129-32.
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    ABSTRACT: We report a case of deep femoral artery (DFA) aneurysm associated with pre-vasculo-Behcet status. A 34-year-old man with a history of recurring oral and genital ulcers was admitted complaining of worsening left thigh pain over the previous 30 days. Computed tomography showed a left DFA aneurysm (60 mm × 70 mm), concomitant aneurysms in the popliteal and carotid arteries, and deep vein thrombosis. Active pre-vasculo-Behcet status was diagnosed, and DFA ligation was performed urgently. Remission was achieved with postoperative prednisolone and colchicine without vascular complications. DFA aneurysm and vascular pathologies were successfully managed by ligation surgery and medical therapy.
    Annals of Vascular Diseases 01/2015; DOI:10.3400/avd.cr.15-00017
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    ABSTRACT: Right-sided aortic arch (RAA) is a rare congenital disorder. We describe herein two cases of thoracic aortic aneurysm with a right aortic arch and right-sided descending aorta treated with thoracic endovascular aortic repair (TEVAR). In one case, a 70-year-old man with Edwards type 1 RAA underwent TEVAR using a Relay stent-graft (Bolton Medical, Barcelona, Spain). In another case, a 72-year-old woman with Edwards type 3 RAA underwent TEVAR using a Kawasumi Najuta stent-graft (Kawasumi Laboratories, Inc., Tokyo, Japan) with the "buffalo horn chimney technique", our original method for left subclavian artery flow preservation. The postoperative courses were uneventful. Postoperative computed tomography showed complete exclusion of the aneurysm without endoleakage. Compared to conventional open surgical repair, TEVAR is challenging in patients with a RAA and right-sided descending aorta. However, our results showed that TEVAR might be feasible and a treatment option even in a patient with a RAA and right-sided descending aorta.
    General Thoracic and Cardiovascular Surgery 12/2014; DOI:10.1007/s11748-014-0514-7
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    ABSTRACT: We investigated the long-term outcomes of repair for acute type A aortic dissection on the basis of false lumen status and assessed treatment modalities for the enlarged downstream aorta.
    Journal of Thoracic and Cardiovascular Surgery 08/2014; 149(2). DOI:10.1016/j.jtcvs.2014.08.008 · 3.99 Impact Factor
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    ABSTRACT: Waffle procedure, a small grid-like incision of epicardium, is a surgical technique for constrictive pericarditis with epicardial thickening. Yet evidences to endorse this approach for improved outcomes are lacking. The aim of this study is to elucidate better surgical treatment strategy for constrictive pericarditis with epicardial thickening.
    General Thoracic and Cardiovascular Surgery 06/2014; 63(1). DOI:10.1007/s11748-014-0434-6
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    ABSTRACT: The Penn classification, a risk assessment system for acute type A aortic dissection (AAAD), is based on preoperative ischemic conditions. We investigated whether Penn classes predict outcomes after surgery for AAAD. Three hundred fifty-one patients with DeBakey type I AAAD treated surgically, January 1997 to January 2011, were divided into 4 groups per Penn class: Aa (no ischemia, n = 187), Ab (localized ischemia with branch malperfusion, n = 67), Ac (generalized ischemia with circulatory collapse, n = 46), and Abc (localized and generalized ischemia, n = 51). Early and late outcomes were compared between groups. In-hospital mortality was 3% (6 of 187) for Penn Aa, 6% (4 of 67) for Penn Ab, 17% (8 of 46) for Penn Ac, and 22% (11 of 51) for Penn Abc. Multivariate logistic regression analysis showed Penn classes Ac and Abc, operation time >6 hours, and entry in the descending thoracic aorta to be risk factors for in-hospital mortality. Incidences of neurologic, respiratory, and hepatic complications differed between groups. Five-year cumulative survival was 85% in the Penn Aa group, 74% in the Penn Ab group (p = 0.027 vs Penn Aa), 78% in the Penn Ac group, and 67% in the Penn Abc group (p <0.001 vs Penn Aa). In conclusion, morbidity and mortality are high in patients with generalized ischemia. The Penn classification appears to be a useful risk assessment system for AAAD, predictive of outcomes.
    The American journal of cardiology 02/2014; 113(4):724-730. DOI:10.1016/j.amjcard.2013.11.017 · 3.43 Impact Factor
  • 01/2014; 25(3):350-354. DOI:10.7134/phlebol.13-29
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    ABSTRACT: Since drug-eluting stents (DESs) appeared in Japan, coronary artery bypass grafting (CABG) has been indicated for more severe lesions. To understand the implications of this trend, we compared SYNTAX scores in two groups of patients treated with CABG before and after DESs approval. Consecutive CABG patients during January 2001-July 2003 (pre-DES era patients, n = 160) and January 2008-July 2010 (DES era patients, n = 103) were included. The SYNTAX scores of both groups were compared and a cardiologist retrospectively re-evaluated coronary angiograms to determine whether CABG or percutaneous coronary intervention (PCI) would be recommended under current standards. SYNTAX scores were significantly higher in DES era group compared with pre-DES era group (33.3 ± 10.6 vs. 28.1 ± 10.6, p < 0.01). Percutaneous coronary intervention would be the preferred treatment option in 66 (41 %) of pre-DES patients, whose SYNTAX scores were significantly lower than those of patients who were considered good candidates for CABG (21.9 ± 9.3 vs. 32.5 ± 9.1, p < 0.01). Although CABG is now being performed in intermediate-to-highly complex cases, DES era outcomes, including operative mortality and early graft failure, have not worsened in comparison to the pre-DES era.
    General Thoracic and Cardiovascular Surgery 12/2013; DOI:10.1007/s11748-013-0360-z
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    ABSTRACT: Atrioesophageal fistula (AEF) is a potentially lethal complication of catheter radiofrequency ablation for atrial fibrillation. A 49-year-old man with paroxysmal atrial fibrillation who underwent catheter ablation around the pulmonary vein was admitted 31 days after the procedure, suffering seizures and fever. Magnetic resonance imaging of the brain showed ischemia and multiple lesions of acute infarction in the right occipital lobe of the cerebrum. Computed tomography (CT) of the chest showed a small accumulation of air between the posterior left atrium and the esophagus, suggesting an AEF. Endoscopic snaring of the esophageal mucosa, repeated a few times, supported by nil by mouth and antibiotic therapy, resulted in improvement of his condition with no recurrence of symptoms. Subsequent chest CT scans confirmed disappearance of the leaked air and the patient was discharged home 45 days after admission with no neurological compromise.
    Surgery Today 10/2013; 44(8). DOI:10.1007/s00595-013-0744-9 · 1.21 Impact Factor
  • Journal of Cardiac Failure 10/2013; 19(10):S113. DOI:10.1016/j.cardfail.2013.08.052 · 3.07 Impact Factor
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    ABSTRACT: Aortic arch replacement has been safely performed by moderate hypothermic circulatory arrest, and antegrade selective cerebral perfusion. To prevent permanent neurological deficit, it is important to precisely evaluate brain, neck vessels and atherosclerotic thoracic aorta by computed tomography(CT), magnetic resonance imaging (MRI)and intraoperative epiaortic echography, which can lead the safest cannulation site, careful manipulation of cerebral perfusion catheters. It is also important to make good exposure of surgical site, especially in distal anastomosis, and irrigate and flush atheromatous debris. Since 1991 to 2013, our consecutive 410 cases of total and hemi arch replacement of aorta, including 57 emergency cases, result in 22 cases( 5.4%) of mortality( 3.1% of elective, 19.3% of emergency) and 10 cases( 2.4%) of stroke( 2.3% of elective, 3.5% of emergency). Mortality and morbidities are more likely be occurred in emergency cases. It is possible to keep good operative results with reliable brain protection of selective antegrade cerebral perfusion which gives enough time for secure open distal anastomosis to every surgeon, but atheroemborism from shaggy aorta remains as a problem yet to be solved.
    Kyobu geka. The Japanese journal of thoracic surgery 10/2013; 66(11):952-957.
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    ABSTRACT: A 70-year-old woman with a medical history of descending aorta replacement for chronic type B aortic dissection 12 years prior was admitted to our hospital with sudden back pain and hemoptysis. The patient was diagnosed with ruptured residual dissected thoracic aortic aneurysm and underwent emergent endovascular treatment. Two TAG thoracic endoprosthesis of different sizes were used to accommodate the discrepancy in size of the true lumen, resulting in a successful closure of the entry tear and hemostasis, without any damage to the intima. Computed tomography performed 3 months after surgery revealed successful remodeling of the remaining aorta. Thoracic endovascular aortic replacement may be considered as an option in the treatment of chronic dissected aortic aneurysm, achieving not only entry closure but possibly remodeling, as well.
    03/2013; DOI:10.5761/atcs.cr.12.02161
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    ABSTRACT: OBJECTIVES: Endovascular stent grafts (SGs) comprise a novel therapeutic approach to repairing aortic aneurysms. However, endovascular repair of the aortic arch remains challenging. Generally, the repair of sites with SGs requires an extra-anatomical bypass. We introduced SG repair of the aortic arch with strategically positioned fenestrations for each arch branch in 2006. An extra-anatomical bypass is not required for this procedure. This study evaluates the early and mid-term outcomes of fenestrated SG treatment. METHODS: We retrospectively analysed the early and mid-term outcomes of 24 of 80 repairs with fenestrated SG among 383 single thoracic aortic aneurysm repairs that were undertaken at our department between January 2006 and March 2012. RESULTS: Technical success was obtained in 100% of the patients. However, there was a 30-day perioperative mortality rate of 4.1% (1 of 24) due to a shower embolism. One patient developed a Type 2 endoleak without aneurysm enlargement within a median follow-up time is 25.1 months. However, migrations or device-related complications requiring additional procedures did not arise. CONCLUSIONS: Treatment with fenestrated SGs does not require surgical transposition of the arch branches. The procedure is widely applicable and less invasive and outcomes are excellent.
    European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 03/2013; DOI:10.1093/ejcts/ezt127 · 2.81 Impact Factor
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    ABSTRACT: Background: Ischemic mitral regurgitation (IMR) with ischemic cardiomyopathy (ICM) was treated with surgical procedures, and mitral leaflet tethering was assessed. Twenty-two patients with both ICM (left ventricular ejection fraction <0.35) and IMR (>2) underwent coronary artery bypass grafting (CABG), mitral annuloplasty (MAP) with or without surgical ventricular restoration (SVR) and procedures targeting the subvalvular apparatus. Methods and Results: Fourteen patients (group 1) underwent CABG and MAP, and the remaining 8 (group 2) underwent CABG, MAP, SVR, papillary muscle approximation (PMA), and papillary muscle suspension (PMS). PMA joined the entire papillary muscles with 3 mattress sutures. For PMS, 2 ePTFE sutures were placed between papillary muscle tips and fibrous annuli. Anterior and posterior mitral leaflet tethering angles (ALA and PLA) relative to the line connecting annuli, posterior and apical displacement of coaptation, and IMR grade were measured on echocardiography. Although preoperative ALA and PLA in group 2 were significantly larger than in group 1, there was no significant difference between groups at 1 month after surgery. At 1 year after surgery, however, the situation reversed: ALA and PLA in group 1 were significantly larger than in group 2. Conclusions: In addition to MAP, procedures targeting the subvalvular apparatus including PMA and PMS achieved persistent reduction of mitral valve leaflet tethering, which might lead to the improvement of long-term outcome.
    Circulation Journal 02/2013; 77(6). DOI:10.1253/circj.CJ-12-1148 · 3.69 Impact Factor
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    ABSTRACT: Hereditary hemorrhagic telangiectasia (HHT; Osler-Weber-Rendu syndrome) is an uncommon disease characterized by abnormal telangiectasias and arteriovenous malformations that cause recurrent bleeding. Here, we present the case of a patient with HHT, who had a history of pulmonary and hepatic arteriovenous malformations and endocarditis of a prosthetic aortic valve that was caused by methicillin-resistant Staphylococcus aureus. The patient underwent the Bentall operation after coil embolization for pulmonary arteriovenous malformations. The postoperative course was uneventful.
    02/2013; 20(Supplement). DOI:10.5761/atcs.cr.12.01933
  • 01/2013; 19(1):1-6. DOI:10.7793/jcoron.19.494
  • 01/2013; 40(4):469-477. DOI:10.7130/jject.40.469
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    ABSTRACT: Fractional flow reserve (FFR) is considered as the gold standard for physiological assessment of coronary artery stenosis. However, it may be difficult to interpret FFR for the stenosis of the donor artery of chronic total occlusion (CTO), because revascularization of CTO may improve FFR of the donor artery. We present a case of 32-year-old male who had a CTO in right coronary artery (RCA), 90 % stenoses in left circumflex artery (LCx) and a mild stenosis in the middle segment of left anterior descending artery (LAD). FFR for the mild stenosis in LAD showed significant value (0.72). However LAD was the donor artery to CTO of RCA, revascularization to RCA was expected to improve FFR for LAD. As the patient had chronic granulocytic leukemia and the difficulty in continuing dual antiplatelet therapy, we selected coronary artery bypass grafting (CABG) to RCA and LCx, and we decided not to perform anastomosis to LAD. Although each graft was patent and collateral flow from LAD to RCA disappeared after CABG, FFR for LAD was still 0.72. Careful consideration should be given when interpreting FFR for the donor artery to a CTO lesion. When CABG is selected, it may be a practical approach to revascularize not only CTO but also FFR positive mild stenosis simultaneously, even though it appears angiographically mild stenosis.
    10/2012; 28(2). DOI:10.1007/s12928-012-0142-z

Publication Stats

737 Citations
148.97 Total Impact Points

Institutions

  • 1992–2014
    • Jichi Medical University
      • Division of Cardiovascular Surgery
      Totigi, Tochigi, Japan
  • 2011–2013
    • Saitama Medical University
      • Department of Cardiovascular Surgery
      Saitama, Saitama, Japan
  • 2006
    • Shonan Kamakura General Hospital
      Kamakura, Kanagawa, Japan
  • 2002
    • Stanford Medicine
      • Department of Cardiothoracic Surgery
      Stanford, California, United States
  • 2000–2001
    • Stanford University
      • Division of Cardiovascular Medicine
      Palo Alto, California, United States
  • 1995
    • Baylor College of Medicine
      • Department of Surgery
      Houston, TX, United States