Shigeyuki Sasaki

Hakodate Municipal Hospital, Hokodate, Hokkaidō, Japan

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Publications (43)57.36 Total impact

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    ABSTRACT: Immunoglobulin (Ig) G4-related disease is a novel disease entity characterized by diffuse lymphoplasmacytic infiltrates and the presence of abundant IgG4-positive plasma cells in extensive fibrosis, frequently associated with tumorous swelling lesion and elevated serum IgG4 concentrations. Immunoglobulin G4-related disease has been described in almost every organ system but rarely affects the heart. We describe a rare case of IgG4-related disease of the heart causing aortic regurgitation and heart block in a 59-year-old woman. The excised lesion revealed a high ratio of IgG4-positive to IgG-positive plasma cells, providing a definite diagnosis of IgG4-related disease. The aortic valve was replaced using Manouguian technique, resulting in a favorable outcome.
    The Annals of thoracic surgery 06/2013; 95(6):e151-e153. · 3.45 Impact Factor
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    ABSTRACT: Purpose: To examine the relationship between incidence of later, local vascular events (restenosis and occlusion) and clinical factors including lipid levels after surgical or endovascular treatment of peripheral artery disease (PAD). Methods: Consecutive 418 PAD lesions (in 308 patients under the age of 70) treated with surgical (n = 188) or endovascular (n = 230) repair for iliac (n = 228) and infrainguinal (n = 190) lesions were retrospectively analyzed. Clinical features and lipid levels were compared between patients who developed vascular events (n = 51; VE group) and those who did not (n = 257; NoVE group). Results: Among assessed factors, post-therapeutic low-density lipoprotein cholesterol (LDL-C) levels (mg/dL) were significantly higher in the VE group (120.4 ± 31.2) than in the NoVE group (108.2 ± 25.1) (P = 0.01). Infrainguinal lesions were more common in the VE than in the NoVE group (P <0.001). Cox hazard analysis indicated that infrainguinal lesions relative to iliac lesions significantly increased the risk of vascular events (hazard ratio (HR) 3.35; 95% CI 1.63-6.90; P = 0.001) and post-therapeutic LDL-C levels <130 (mg/dL) decreased the risk (HR 0.34; 95%CI 0.17-0.67; P = 0.002). Conclusion: Lowered post-therapeutic LDL-C levels can decrease the risk of later, local vascular events after PAD treatment. These results may support the rationale for aggressive lipid-modifying therapy for PAD.
    Annals of Vascular Diseases 01/2012; 5(2):180-9.
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    ABSTRACT: Purpose: To examine the relationship between the incidence of later cardiovascular events after abdominal aortic aneurysm (AAA) surgery and postoperative lipid levels. Methods: Atherosclerotic risk factors including postoperative serum lipid levels were examined in 116 patients aged 70 or less undergoing an elective AAA surgery. Later cardiovascular events after AAA surgery occurred in 21 patients, including cerebral infarction (n = 4), catheter intervention or surgery for coronary artery disease (CAD) (n = 10) and other vascular disease. Results: Postoperative cholesterol levels during the average follow-up period of 55.6 ± 44.3 (months) were 49.0 ± 15.7 (mg/dL) for high-density lipoprotein cholesterol (HDL-C), 97.9 ± 31.2 (mg/dL) for low-density lipoprotein cholesterol (LDL-C), which were both significantly improved compared to preoperative values (p <0.001). Cox hazard analysis indicated that preexistent CAD significantly increased in the risk for later cardiovascular events (hazard ratio 5.67; 95%CI 1.92-16.8; p = 0.002) and lowered postoperative LDL-C/HDL-C ratio <1.5 decreased in the risk after AAA surgery (hazard ratio 0.10; 95%CI 0.01-0.83; p = 0.033). Patients with postoperative LDL-C/HDL-C ratio <1.5 (n = 22) had a significantly better cardiovascular event-free rate than those with that ratio ≥1.5 (n = 94) (p = 0.014). Conclusion: Lowered postoperative LDL-C/HDL-C ratio <1.5 can decrease in the risk for later cardiovascular events after AAA surgery. These results may support the rationale for postoperative aggressive lipid-modifying therapy.
    Annals of Vascular Diseases 01/2012; 5(1):36-44.
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    ABSTRACT: To prevent pulmonary embolism due to deep venous thrombosis (DVT), we have treated 611 patients undergoing orthopedic surgery of the lower extremities with our protocol including pre- and postoperative ultrasonic venous screening and anticoagulant therapy if necessary. A total of 118 patients (19.3%) developed DVT. Among demographic and clinical factors, the site of operation (knee joint surgery: odds ratio 5.17), age (>60: odds ratio 3.91), and operation time (>120 minutes: odds ratio 4.52) were identified as significant risk factors of development of DVT. One patient received an infusion of urokinase for DVT of femoral vein, but no patients developed serious postoperative bleeding or pulmonary thromboembolisms. (*English Translation of J Jpn Coll Angiol, 2010, 50: 95-100.).
    Annals of Vascular Diseases 01/2012; 5(3):328-33.
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    ABSTRACT: Mitral valvuloplasty using Gore-Tex (W.L. Gore & Associates, Inc, Flagstaff, AZ) as artificial chordae is often associated with difficulties in determining the length of the artificial chordae, as well as preventing knot slippage, especially for patients with broad anterior leaflet prolapse. We describe a simple technique that enables surgeons to easily determine the correct length of the artificial chordae and tie slippery knots without using a specific device.
    The Annals of thoracic surgery 09/2011; 92(3):1132-4. · 3.45 Impact Factor
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    ABSTRACT: It is not clear whether surgical ventricular restoration (SVR) or procedures approaching mitral complex for controlling functional mitral regurgitation (MR) affect the regional left ventricular wall function. The purpose of the present study was to evaluate the regional LV function after SVR using overlapping left ventriculoplasty (OLVP) using quantitative gated myocardial perfusion SPECT (QGS). Forty-one heart failure patients, including those with ischemic cardiomyopathy (ICM) (n = 25) and non-ICM (NICM) (n = 16), underwent SVR and/or papillary muscle approximation (PMA). The rest myocardial perfusion SPECT were performed before and early after operation (mean 25.8 ± 10.6 days). These patients were divided into 4 groups based on the surgical procedures (SVR and/or PMA) and etiology of patients (ICM or NICM) as follows: SVR (with or without PMA) of ICM, SVR of NICM, PMA of ICM and PMA of NICM groups. The regional wall thickening was compared before and after the operation between the four groups.Results: NYHA functional classes were improved after the operation in all four groups. MR grade was also improved in three groups other than SVR of the ICM group. The left ventricular basal wall thickening was improved postoperatively in following three groups (SVR of ICM: 12.7 ± 3.8% to 16.5 ± 4.6% p <0.05, PMA of ICM: 11.1 ± 4.3% to 14.9 ± 4.8% p <0.05, SVR of NICM: 5.8 ± 6.6% to 12.3 ± 6.4% p <0.05), whereas PMA of the NICM group did not show an improvement. Wall thickening in the middle and distal levels was not improved in all groups. OLVP improved NYHA functional classes, and also improved the regional wall function at the basal level of the left ventricle. In contrast, lone PMA did not improve or impair the regional wall function at any of the levels.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 08/2011; 17(6):552-8.
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    ABSTRACT: While prolonged visceral ischemia seems to be a potential source of elevated proinflammatory cytokines during thoracoabdominal aortic aneurysm (TAAA) repair, the underlying mechanisms are unclear. We have investigated the production of cytokines and fatty acid binding proteins (FABPs) in the hepatosplanchnic system during TAAA repair. Arterial and hepatic venous levels of tumor necrosis factor-alpha (TNF-α), interleukin (IL) -6, -8, and -10, and liver- and intestinal-type FABPs (L-FABP, I-FABP) were measured at four time points in ten patients undergoing TAAA repair. Visceral arteries were perfused through either a side-arm of distal aortic perfusion or an individual circuit using an independent pump, or both, without measuring perfusion pressure or blood flow. The postoperative courses of all patients were uneventful. During visceral perfusion, the levels of arterial IL-6, -8, and -10, and L-FABP elevated significantly (P = 0.0077, 0.0051, 0.0077, 0.0077, respectively), and these elevated levels persisted up to skin closure, with the exception of L-FABP (P = 0.0051 each). In contrast, there were only subtle increases in TNF-α and I-FABP levels. The production ratio through the hepatosplanchnic system of TNF-α, L-FABP, and I-FABP showed a pronounced peak during visceral perfusion, but only the peak of L-FABP was significant compared with baseline (P = 0.0077). All production ratios returned to baseline level at skin closure. The production ratio of IL-6 was negative throughout the operation and that of IL-8 and IL-10 remained at baseline during visceral perfusion. In conclusion, a portion of the TNF-α, L-FABP, and I-FABP might be produced temporarily in the hepatosplanchnic system during TAAA repair. Systemic elevation of IL-6, IL-8, and IL-10 might be modulated by inflammatory response to extracorporeal circulation or surgical stress. Thus, our simple visceral perfusion techniques may indeed be justified.
    Journal of Artificial Organs 06/2011; 14(3):192-200. · 1.41 Impact Factor
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    ABSTRACT: After radiofrequency (RF) ablation became available, the indication of MAZE procedure conducted with bipolar RF was expanded. We examined the efficacy and feasibility of the RF MAZE procedure in valve surgery and identified the predictors of atrial fibrillation (AF) recurrence. Forty-four patients had permanent AF at the time of operation and underwent a biatrial RF MAZE procedure. Univariate and multivariate analysis for the predictor of permanent AF recurrence and follow-up studies were performed. Of the patients, 37 (84.1%) were in non-AF rhythm at discharge and 25 (80.6%) were at the latest follow-up (mean, 2.1 ± 1.2 years). In stepwise multivariate analysis, left atrial dimension (LAD) > 61.5 mm was an independent predictor of early-term recurrence of AF (P = 0.006) and late-term recurrence (P = 0.038) as well. F-wave voltage <0.1 mV was significant in univariate analysis but was not significant in multivariate analysis for predictor of late-term AF recurrence. Avoidance of AF in the late term was 56% for LAD > 60 mm whereas it was 91% for LAD ≤ 60 mm (P = 0.043), 67% for F-wave < 0.1 mV compared to 100% for F-wave ≥ 0.1 mV (P = 0.031), and 43% for LAD > 60 mm and F-wave < 0.1 mV compared to 91% for LAD ≤ 60 mm and/or F-wave ≥ 0.1 mV (P = 0.016), respectively. Although avoidance of AF in the late term was lower in patients with LAD > 60 mm or F-wave < 0.1 mV, more than half of these patients were free from AF in the late term. LA size was assumed to be a simple and strong predictor of recurrent AF in this procedure. Predictive criteria that had been widely employed for the "cut-and-sew" MAZE procedure accompanied with valve surgery can be expanded in the MAZE procedure with RF devices.
    General Thoracic and Cardiovascular Surgery 06/2011; 59(6):406-12.
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    ABSTRACT: Aneurysm of an aortocoronary saphenous vein graft (SVG) is a rare but potentially fatal complication after coronary artery bypass grafting (CABG). Prevention of cerebral infarction or myocardial infarction due to the intraluminal debris from the SVG aneurysm is an important issue during surgical procedures. We report two patients with SVG aneurysms located in the proximal and distal portions of the SVG body, respectively. The surgical strategy for each case was determined according to the location of the aneurysm. We used low-flow cardiopulmonary bypass without aortic clamping in one patient and cardiac arrest with aortic clamping in the other. Both patients were discharged without sequelae.
    General Thoracic and Cardiovascular Surgery 06/2011; 59(6):426-8.
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    ABSTRACT: Purpose: To determine the predictive value of serum lipid levels on the development of later cardiovascular events after abdominal aortic aneurysm (AAA) surgery. Methods: A total of 101 patients under 70 undergoing an elective AAA surgery were divided into the following two groups: 1) those who developed later cardiovascular events after AAA surgery, including cerebral infarction (n = 4), catheter intervention (PCI) or surgery for coronary artery disease (CAD) (n = 9) and other vascular disease. (CVE group; n = 19); 2) those without later events (NoCVE group: n = 82). Preoperative atherosclerotic risk factors including serum lipid levels were subjected to univariate and multivariate analysis. Results: The CVE group showed a significantly lower high-density lipoprotein cholesterol (HDL-C) level (32.9 ± 6.6 vs 41.6 ± 12.1 mg/dL; p <0.001), higher low-density lipoprotein cholesterol (LDL-C) / HDL-C ratio (4.30 ± 1.01 vs 3.24 ± 1.15; p = 0.001), and higher prevalence of mild CAD (without an indication of PCI) (p = 0.029) preoperatively. Cox hazard analysis indicated that preexistent mild CAD (hazard ratio 4.70) and preoperative HDL-C <35 mg/dL (hazard ratio 3.07) were significant predictors for later cardiovascular events after AAA surgery. Conclusion: Patients at high risk for later cardiovascular events should require a careful follow-up and may also require an aggressive lipid-modifying therapy.
    Annals of Vascular Diseases 01/2011; 4(2):115-20.
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    ABSTRACT: Gelatin-resorcin-formalin (GRF) glue, a haemostatic agent often employed for aortic surgery, has beneficial effects on early results in surgery for acute aortic dissection but may have late adverse effects, probably due to excess use of the activators such as formaldehyde and glutaraldehyde. The purpose of this study was to determine the optimal proportions of GRF components that minimise toxicity to human aortic smooth muscle cells and elastin with acceptable adhesive strength. (1) The degree of polymerisation was examined at various proportions (activator/gelatin+resorcinol=0%, 2%, 4%, 6%, 8% and 10%) to estimate adhesive strength. (2) (i) The toxicity of the activator was confirmed 24h after its supplementation to human aortic smooth muscle cells in various proportions (activator/human aortic smooth muscle cell=0%, 0.5%, 1%, 1.5%, 2% and 2.5%). (ii) The toxicity of GRF glue to human aortic smooth muscle cells was evaluated 1h and 60 h after its supplementation (activator/gelatin+resorcinol=0%, 2%, 4%, 6%, 8% and 10%). Another set of experiments in the same study was also performed. The only difference was that GRF glues were washed after polymerisation to exclude non-polymerised constituents. (3) Effects of 8%-GRF glue on toxicity to elastin derived from human aortic wall cells were investigated using an immunoblotting method. (1) The polymerisation area increased dose dependently and that of the 10% activator/gelatin+resorcinol mixture was significantly wider than those of 6%, 4%, 2% and 0%, but had no significant difference from that of 8%. (2) (i) Human aortic smooth muscle cell death occurred in all dishes except activator-free dishes. (ii) Sixty hours after exposure to GRF glue, human aortic smooth muscle cell death occurred only in the 10% dish. In a washed GRF glue study, no human aortic smooth muscle cell death occurred in any dishes. (3) Toxicity to elastin was not significantly different between 8%-GRF glue and the control, whereas toxicity of elastase to elastin was significantly higher than for both the glue and the control. An 8%-GRF glue provides lower toxicity to human aortic smooth muscle cells and elastin with an acceptable degree of polymerisation, and thus seems to be an optimal proportion for GRF glue.
    European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 08/2009; 36(6):962-6. · 2.40 Impact Factor
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    ABSTRACT: To identify the most prognostic predictor of Stanford type B aortic dissection at admission. Forty-three patients with Stanford type B aortic dissection were divided into two groups: (1) those who developed dissection-related events later (EV group: n = 18), including the need for surgery (n = 12), rupture (n = 1), dissection-related death (n = 5), and aortic enlargement > or =5 mm in diameter per year (n = 15); (2) those without later events (NoEV group: n = 25). Clinical features, aortic diameters, and blood flow status were compared. The maximum aortic diameter at admission was 41.5 +/- 1.7 mm for the EV group, which was significantly greater than the NoEV group (34.4 +/- 0.9 mm, p <0.001). A maximum aortic diameter > or =40 mm was found in 11 patients (61%) of the EV group, whereas this maximum was found in 4 (16%) of the NoEV group (p = 0.004). A patent false lumen at admission was found in all patients of the EV group and in 17 (68%) of the NoEV group (p = 0.013). Other factors were not significant. A Cox hazard analysis indicated a maximum aortic diameter > or =40 mm as a significant predictor for dissection-related events (hazard ratio 3.13, p = 0.032). The presence of a patent false lumen did not reach a statistical significance. Our results indicated that a maximum aortic diameter > or =40 mm at admission was the most prognostic factor for developing late dissection-related events, rather than the presence of a patent false lumen.
    Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia. 10/2008; 14(5):303-10.
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    ABSTRACT: We report a case of hypertrophic obstructive cardiomyopathy (HOCM) successfully treated with septal myectomy and mitral valve replacement (MVR) combined with a resection of the hypertrophic papillary muscles. The patient, a 74-year-old woman, first underwent the conventional septal myectomy through aortotomy. The papillary muscles revealed a marked hypertrophy, but extended myectomy and precise resection of the hypertrophic papillary muscles were thought to be difficult through the aortotomy. Through the right-sided left atriotomy, MVR and resection of the papillary muscles were additionally performed. The patient was smoothly weaned from the cardiopulmonary bypass, and the postoperative course was uneventful. The outflow pressure gradient was relieved to 0 mm Hg, from 94. The mean pulmonary artery pressure was reduced to 27 mm Hg, from 42. The patient has been doing well in the New York Heart Association (NYHA) functional class between I and II during 45 months of follow-up, without complications related to the use of a prosthetic valve. Septal myectomy is the procedure of choice in the surgical treatment of HOCM for most cases, but some may require additional mitral valve procedures. In patients with marked hypertrophic papillary muscles, MVR and resection of the muscles may be an option of treatment to ensure a relief of the outflow obstruction and to abolish systolic anterior movement in units with limited experience.
    Annals of thoracic and cardiovascular surgery: official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 09/2008; 14(4):258-62. · 0.47 Impact Factor
  • Yoshiro Matsui, Shigeyuki Sasaki
    Annals of thoracic and cardiovascular surgery: official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 05/2008; 14(2):66-74. · 0.47 Impact Factor
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    ABSTRACT: Retroperitoneal fibrosis (RPF) is a relatively rare disease which shows a periaortic mass in the retroperitoneal area and predisposes to an obstructive uropathy. We report a case of idiopathic RPF occurring in a patient who was suspected of impending rupture of abdominal aortic aneurysm. A 60-year-old male, with a 2-week history of abdominal pain, was transferred for evaluation of the periaortic mass. Computed tomographic (CT) scan revealed radiological findings such as leakage of contrast media from the aortic lumen and expansion of the periaortic mass. The patient underwent laparotomy, which revealed retroperitoneal fibrotic plaques in the absence of aortic aneurysm. The pathological findings of the biopsy specimen were consistent with idiopathic RPF. The patient received ureteral stent placement and was treated with steroid therapy. When a similar case is encountered, our recommendations are as follows: (i) Both CT scan and magnetic resonance (MR) imaging should be performed to determine whether the retroperitoneal mass is due to idiopathic or secondary RPF. If idiopathic RPF is suspected, the patient should receive primary steroid therapy. (ii) Retroperitoneal periaortic mass indicates a need for the assessment of obstructive uropathy. Early placement of the ureteral stent is necessary for urinary decompression and preservation of the renal function in patients with obstructive uropathy.
    Annals of thoracic and cardiovascular surgery: official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 03/2008; 14(1):55-9. · 0.47 Impact Factor
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    ABSTRACT: Retrograde cardioplegia often fails to provide adequate perfusion of the right ventricle and the posterior wall of the left ventricle because of the shunt through the thebesian vein. However, much of the retrograde cardioplegic solution may leak into the right atrium after veno-venous anastomoses at the apex of the heart, especially when a retrograde balloon cannula is inserted too deeply in the great cardiac vein, although this is not widely recognized. We designed a new retrograde cardioplegic cannula with three self-inflating balloons, which reduced the shunt flow by occluding the junction of the middle cardiac vein and improving in cardioplegic delivery. We describe the myocardial dye distribution achieved by using this new cannula in pig hearts and report the results of its clinical application.
    Surgery Today 02/2007; 37(1):89-92. · 0.96 Impact Factor
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    ABSTRACT: Distal limb ischemia may occur as a serious complication related to the use of femoral cannulation during veno-arterial cardiopulmonary support (CPS). We developed a simple cannula for femoral arterial cannulation with two holes in the side wall, which could provide the distal limb blood flow without additional cannulation or surgical procedure. This cannula can be inserted into the femoral artery by routine Seldinger technique. The distal blood flow from the side holes can be confirmed by Doppler detector without specialized techniques. In porcine experimental model, the distance between the position where the blood flow was first detected and those where the blood leakage took place was at least more than 10 mm. When this cannula and its side holes were adequately positioned, the mean distal limb flow ranged from 75 to 90 mL/min under CPS at a flow of 1.5 L/min. We employed this cannula for six patients in clinical settings. Three patients showed a good distal limb blood flow at the introduction position without its adjustment. The other three patients showed distal limb ischemia at the introduction position, but the limb ischemia was soon recovered after a slight adjustment of its position. There was no blood leakage from the percutaneous entry into the artery in all cases. We currently use this cannula as the first choice for patients undergoing a prolonged CPS.
    Artificial Organs 08/2006; 30(7):557-60. · 1.96 Impact Factor
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    ABSTRACT: Mitral valve replacement in the presence of extensive calcification of the mitral annulus is a technical challenge. Dense calcification of the annulus can cause a great difficulty in the insertion of a prosthetic valve and later periprosthetic leakage. A radical calcium debridement may cause left circumflex coronary artery injury, atrioventricular rupture, and thromboembolic events. We report a case of a 65-year-old woman suffering from mitral regurgitation with a severely calcified mitral annulus. She underwent mitral valve replacement using a collar-reinforced prosthetic valve, which allowed the surgeon to safely insert a prosthetic valve, avoiding the calcification completely without any major complications. We recommend this method as a feasible technique for mitral valve replacement in the presence of heavily calcified or disrupted fragile mitral annulus.
    Annals of thoracic and cardiovascular surgery: official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 09/2005; 11(4):260-3. · 0.47 Impact Factor
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    ABSTRACT: We report early outcome of our modified papillary muscles approximation (PMA) as an adjunct to mitral annuloplasty (MAP) by analyzing the mitral coaptation zone echocardiographically and clinical outcome in three different procedures. Mitral valve coaptation depth (MVCD) and tenting area were measured in patients with ischemic (n=8) or non-ischemic (n=22) dilated cardiomyopathy (ICM or non-ICM) undergoing either of following: Group I: isolated left ventricular volume reduction (LVVR) (n=11), Group II: PMA plus LVVR (n=14), Group III: isolated PMA (n=5). Clinical outcome including cardiac function were also investigated. Thirty-day mortality was 6.7%. Postoperative data in overall survivors showed significant improvement of ejection fraction (EF) (from 19+/-7 to 32+/-9%), left ventricular end-diastolic volume index (LVEDVI) (from 189+/-74 to 132+/-41 mL/m2), and left ventricular diastolic dimension (LVDd) (from 73+/-8 to 65+/-6 mm) (p<0.001). The overall preoperative MVCD (mm) and tenting area (cm2) was 10.4+/-2.8 and 2.4+/-0.6, respectively, which were both significantly reduced to 5.6+/-2.5 and 0.8+/-2.4 postoperatively (p<0.001). In comparison of the degree (%change) of improvement, Group II and III showed favorable effects on tethering force, compared with Group I. Our modified PMA is a relatively safe method to have the potential for improving tethering of the mitral valve and clinical outcome in evaluating mitral coaptation zone.
    Annals of thoracic and cardiovascular surgery: official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 06/2005; 11(3):164-71. · 0.47 Impact Factor
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    ABSTRACT: Mitral valvuloplasty using Gore-Tex as artificial chordae, especially for patients with anterior leaflet prolapse, is often associated with difficulties in determining the length of artificial chordae as well as in preventing knot slipping. We describe a simple technique of using a new device that enables surgeons to easily determine the accurate length of the artificial chordae and to tie the slippery knot without sliding and damaging it.
    The Annals of thoracic surgery 04/2005; 79(3):1064-5. · 3.45 Impact Factor

Publication Stats

204 Citations
57.36 Total Impact Points

Institutions

  • 2012
    • Hakodate Municipal Hospital
      Hokodate, Hokkaidō, Japan
  • 2003–2012
    • Kokura Memorial Hospital
      Kitakyūshū, Fukuoka, Japan
  • 2003–2011
    • Health Sciences University of Hokkaido
      Tōbetsu, Hokkaidō, Japan
  • 2000–2011
    • Hokkaido University
      • Department of Cardiovascular Surgery
      Sapporo-shi, Hokkaido, Japan
  • 1997–2011
    • Hokkaido University Hospital
      • Division of Cardiovascular and Thoracic Surgery
      Sapporo-shi, Hokkaido, Japan
  • 2002–2004
    • Nippon Telegraph and Telephone
      Edo, Tōkyō, Japan