Atsushi Yamaguchi

Jichi Medical University, Totigi, Tochigi, Japan

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Publications (129)135.26 Total impact

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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; · 3.53 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;
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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. · 3.58 Impact Factor
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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;
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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; · 0.96 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.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 03/2013;
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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; · 2.40 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; · 3.58 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.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 02/2013;
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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.
    Cardiovascular intervention and therapeutics. 10/2012;
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    ABSTRACT: We surveyed the incidence of blood pump diaphragm damage (rupture or crack) in the NIPRO-ventricular assist device (VAD). In the cases in which rupture or suspected blood pump crack was detected, we disassembled the pumps to visually check the condition of the diaphragm after replacement or use. Of 366 blood pumps surveyed, diaphragm damage was observed in 2.7 %. The duration of use of the blood pumps with diaphragm damage was significantly longer than that of pumps without damage. The incidence of diaphragm damage increased with longer duration of use. On the basis of these findings, blood pump diaphragm damage in the NIPRO-VAD may be associated with duration of use. However, some blood pumps were used for prolonged periods without diaphragm damage. All blood pumps with damage had a crack in the diaphragm on the air chamber side near the diaphragm-housing (D-H) junction. Cracks were not found in any specific part of the diaphragm. In blood pumps with diaphragm rupture, the crack had a through-hole reaching the blood-contacting surface. Although we were unable to identify the causes of the cracks, it is suggested that when a crack appears in the diaphragm it will gradually expand and eventually lead to rupture. If a crack is detected in a blood pump, we advocate replacing the pump before it grows. When the NIPRO-VAD is used, it is necessary to keep in mind that blood pump diaphragm damage may occur.
    Journal of Artificial Organs 08/2012; · 1.41 Impact Factor
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    ABSTRACT: PURPOSE: The effective orifice area index (EOAI) is used to define the prosthesis-patient mismatch (PPM) after aortic valve replacement (AVR). However, few studies have so far evaluated whether the cutoff value for PPM varies across prostheses. This study assessed the hemodynamics in patients given a mechanical valve and then re-evaluated the validity of the commonly accepted threshold. METHODS: The subjects included 329 patients that underwent AVR with a St. Jude Medical Regent valve. The transvalvular pressure gradient and EOAI were determined echocardiographically, and the commonly accepted threshold was analyzed in relation to survival. RESULTS: The mechanical valves very often yielded a postoperative transvalvular pressure gradient >10 mmHg, and thus, clinically significant residual pressure, regardless of the EOAI. The slope of the curve describing the relationship between the transvalvular pressure gradient and EOAI was gentler than that reported for bioprosthetic valves, for which the pressure gradient rises sharply at EOAI <0.85 cm(2)/m(2). The commonly defined PPM did not affect the long-term survival or regression of the left ventricular mass index. CONCLUSIONS: The relationship between the transvalvular pressure gradient and the EOAI in patients given a mechanical prosthesis differed from the reference standard. These data suggest the need to reconsider the appropriate cutoff value for PPM in relation to different prostheses.
    Surgery Today 08/2012; · 0.96 Impact Factor
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    Manabu Shiraishi, Atsushi Yamaguchi, Hideo Adachi
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    ABSTRACT: A 65-year-old woman with exercise-related dyspnea was admitted to our hospital. Transthoracic echocardiography demonstrated a large anomalous papillary muscle that originated from the posterior wall of the left ventricle and severe mitral valve regurgitation in systole. Cleft suture, 5-0 polytetrafluoroethylene sutures from a single papillary muscle to the anterior commissure leaflet (AC), 5-0 polypropylene sutures between AC and A1, and between A1 and A2, the double-orifice technique, and ring plasty with 32-mm semi-rigid ring was performed. Postoperative echocardiography showed an improvement in severe mitral valve regurgitation. At the 2-month follow-up, the patient was in good health. In the present case, the elderly patient with an isolated parachute mitral valve but without any other cardiac anomaly and presenting with mitral valve regurgitation is extremely rare. This case of mitral valvuloplasty for a parachute mitral valve with a single papillary muscle in an elderly woman has not been reported before.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 05/2012;
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    ABSTRACT: A 75-year-old female was admitted to our hospital with sudden back pain and right leg ischemia. Computed tomography showed acute type A aortic dissection with the occlusion of the right common iliac artery. The patient was treated with ascending aorta replacement and femoro-femoral bypass. Three hours after the operation, the patient went into a sudden shock. Electrocardiogram showed ventricular tachycardia and ventricular fibrillation. Percutaneous cardio-pulmonary support was administered and coronary arteriogram (CAG) was proceeded for evaluation of the coronary arteries. Although CAG revealed normal coronary arteries, intravascular ultrasound showed mobile intimal flap at left main coronary artery trunk, suggesting dissection of the coronary artery. Percutaneous coronary intervention of the left main coronary artery trunk was performed. The patient recovered from shock and was discharged from the hospital without any major complication.
    General Thoracic and Cardiovascular Surgery 05/2012; 60(6):381-5.
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    ABSTRACT: Ventricular septal perforation represents a serious complication after acute myocardial infarction. This study aimed to evaluate the short-term and longterm outcomes of postinfarction ventricular septal perforation (VSP). We evaluated outcomes for VSP repair for 42 patients over 19 years. A retrospective analysis of clinical records, risk factors for hospital death, and long-term survival was performed. In-hospital mortality was 33.3%. The most common cause of hospital death was left-sided heart failure. A low ejection fraction and short time interval from acute myocardial infarction to the onset of VSP were significant risk factors. The actuarial survival rates of in-hospital survivors at 5 and 10 years were 81.7% and 43.5%, respectively. There were 17 cardiac events among the survivors during the follow-up period. The most influential factor affecting long-term outcomes was the number of diseased coronary arteries. The long-term survival outcome of VSP patients during the postoperative period was comparatively good, but the prognosis of VSP patients with multivessel disease was not satisfactory because of congestive heart failure or ventricular arrhythmia. We believe that postoperative medical treatment for preventing cardiac remodeling is important for improving long-term survival outcomes in such patients.
    General Thoracic and Cardiovascular Surgery 05/2012; 60(5):261-7.
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    ABSTRACT: A 78-year-old man with a history of neurofibromatosis was transferred to our hospital for treatment of an abdominal aortic aneurysm. T The patient was treated by stent graft implantation and was discharged from the hospital without complications. After discharge, the patient reported repeated episodes of abdominal pain. Computed tomography performed 3 months postoperatively showed localized lymphadenopathy along the graft with extravasation of contrast, suggesting the diagnosis of rupture of the aortic aneurysm. Emergent laparotomy was performed, which showed penetration of the graft through the aortic wall due to deformation of the aorta caused by lymphadenopathy. The lymphadenopathy resolved after removal of the graft. This is the first reported case of stent graft failure due to aortic deformation associated with neurofibromatosis.
    General Thoracic and Cardiovascular Surgery 05/2012; 60(5):308-11.
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    ABSTRACT: A secondary aortoenteric fistula is a relatively rare complication of abdominal aortic reconstruction. The clinical manifestation of aortoenteric fistula is usually upper gastrointestinal bleeding. We report a patient who developed acute aortic occlusion following chronic cellulitis, which is an uncommon finding. A 50-year-old man with a history of aortobifemoral bypass grafting was admitted for tiredness, fever and swelling of his right leg. On the 40th day of admission, he developed acute aortic occlusion. Computed tomography revealed right distal aortic graft occlusion and the presence of gas surrounding the graft. Gastroduodenoscopy showed an underlying Dacron graft consistent with an aortoenteric fistula in the third part of the duodenum. We excised the infected graft and reconstructed the abdominal aorta with a new prosthetic graft in situ, which was wrapped with the vascularized pedicle of the omentum. The duodenal defect was repaired with segmental duodenal resection and end-to-end anastomosis. The patient recovered well after surgical management and has remained in good condition for 2 years without developing any signs of recurrence of infection.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 04/2012;
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    ABSTRACT: Pulmonary artery aneurysm (PAA) is generally a rare lesion, and there is no definitive approach for it. We report the case of a 45-year-old man who was admitted for the evaluation of dyspnea. In childhood, he had been diagnosed with PAA with congenital pulmonary valve stenosis and regurgitation, and he had a percutaneous transvenous pulmonary valve commissurotomy. Transthoracic echocardiogram showed dilatation of the right atrium and right ventricle, with right ventricular hypertrophy. There was severe pulmonary valve regurgitation, and the main pulmonary artery was dilated to 68 mm in diameter. From the surgical findings, the left leaflet of pulmonary valve was torn from commissure with failure to coapt with the other leaflet. After direct sutures of edges of the left leaflet, a nearly normal valvular competence was restored. The PAA was repaired with a Y-shaped 24 × 12 mm Dacron graft replacement. The postoperative course was uneventful, and the patient was discharged.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 03/2012; 18(5):491-3.
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    ABSTRACT: Mechanical prosthetic valve dysfunction caused by pannus formation is rare. Pannus restricts move-ment of prosthetic valve leaflets, resulting in severe aortic regurgitation. We describe the case of a 77-year-old woman who presented to the emergency room with increasing dyspnea, ischemia, and shock secondary to mechanical aortic valve dysfunction. Transesophageal echocardiography showed a blockade of the leaflets of the mechanical aortic valve, with severe aortic regurgitation. She under-went emergent cardiac surgery for aortic valve replacement. Pannus formation should be considered as a potential cause of acute severe aortic regurgitation in a patient with a small-sized mechanical aortic prosthesis in the supra-annular position. On a pathological exam, extensive pannus was found on the ventricular side of the prosthetic valve, extending from the ring into the central orifice.
    02/2012;

Publication Stats

565 Citations
135.26 Total Impact Points

Institutions

  • 1998–2014
    • Jichi Medical University
      • Division of Cardiovascular Surgery
      Totigi, Tochigi, Japan
  • 2011–2013
    • Saitama Medical University
      • Department of Cardiovascular Surgery
      Saitama, Saitama-ken, Japan
  • 2006
    • Shonan Kamakura General Hospital
      Kamakura, Kanagawa, Japan
  • 1998–2003
    • Stanford University
      • • Department of Cardiothoracic Surgery
      • • Falk Cardiovascular Research Center
      • • Division of Vascular Surgery
      Stanford, CA, United States
  • 1995
    • Baylor College of Medicine
      • Department of Surgery
      Houston, TX, United States