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Saito T, Inohara T, Tsuruta H, Yashima F, Shimizu H, Fukuda K, Ohno Y, Nishina H, Izumo M, Asami M, Naganuma T, Mizutani K, Yamawaki M, Tada N, Yamanaka F, Shirai S, Noguchi M, Ueno H, Takagi K, Watanabe Y, Yamamoto M, Hayashida K. Pre-Existing Left Bundle Branch Block and Clinical Outcomes After Transcatheter Aortic Valve Replacement. JACC. ASIA 2024; 4:306-319. [PMID: 38660100 PMCID: PMC11035950 DOI: 10.1016/j.jacasi.2023.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 10/11/2023] [Accepted: 11/05/2023] [Indexed: 04/26/2024]
Abstract
Background Few reports on pre-existing left bundle branch block (LBBB) in patients undergoing transcatheter aortic valve replacement (TAVR) are currently available. Further, no present studies compare patients with new onset LBBB with those with pre-existing LBBB. Objectives This study aimed to investigate the association between pre-existing or new onset LBBB and clinical outcomes after TAVR. Methods Using data from the Japanese multicenter registry, 5,996 patients who underwent TAVR between October 2013 and December 2019 were included. Patients were classified into 3 groups: no LBBB, pre-existing LBBB, and new onset LBBB. The 2-year clinical outcomes were compared between 3 groups using Cox proportional hazards models and propensity score analysis to adjust the differences in baseline characteristics. Results Of 5,996 patients who underwent TAVR, 280 (4.6%) had pre-existing LBBB, while 1,658 (27.6%) experienced new onset LBBB. Compared with the no LBBB group, multivariable Cox regression analysis showed that pre-existing LBBB was associated not only with a higher 2-year all-cause (adjusted HR: 1.39; 95% CI: 1.06-1.82; P = 0.015) and cardiovascular (adjusted HR: 1.60; 95% CI: 1.04-2.48; P = 0.031) mortality, but also with higher all-cause (adjusted HR: 1.43, 95% CI: 1.07-1.91; P = 0.016) and cardiovascular (adjusted HR: 1.81, 95% CI:1.12-2.93; P = 0.014) mortality than the new onset LBBB group. Heart failure was the most common cause of cardiovascular death, with more heart failure deaths in the pre-existing LBBB group. Conclusions Pre-existing LBBB was independently associated with poor clinical outcomes, reflecting an increased risk of cardiovascular mortality after TAVR. Patients with pre-existing LBBB should be carefully monitored.
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Affiliation(s)
- Tetsuya Saito
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Taku Inohara
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Hikaru Tsuruta
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Fumiaki Yashima
- Department of Cardiology, Saiseikai Utsunomiya Hospital, Tochigi, Japan
| | - Hideyuki Shimizu
- Department of Cardiovascular Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Keiichi Fukuda
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - Yohei Ohno
- Department of Cardiology, Tokai University School of Medicine, Isehara, Japan
| | - Hidetaka Nishina
- Department of Cardiology, Tsukuba Medical Center Hospital, Tsukuba, Japan
| | - Masaki Izumo
- Department of Cardiology, St. Marianna University, Tokyo, Japan
| | - Masahiko Asami
- Division of Cardiology, Mitsui Memorial Hospital, Tokyo, Japan
| | - Toru Naganuma
- Department of Cardiology, New Tokyo Hospital, Matsudo, Japan
| | | | - Masahiro Yamawaki
- Department of Cardiology, Saiseikai Yokohama-City Eastern Hospital, Tsurumi, Japan
| | - Norio Tada
- Department of Cardiology, Sendai Kousei Hospital, Sendai, Japan
| | - Futoshi Yamanaka
- Department of Cardiology, Shonan Kamakura General Hospital, Kamakura, Japan
| | - Shinichi Shirai
- Department of Cardiology, Kokura Memorial Hospital, Kokura, Japan
| | - Masahiko Noguchi
- Department of Cardiology, Tokyo Bay Urayasu Ichikawa Medical Center, Urayasu, Japan
| | - Hiroshi Ueno
- Department of Cardiology, Toyama University Hospital, Toyama, Japan
| | - Kensuke Takagi
- Department of Cardiology, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Yusuke Watanabe
- Department of Cardiology, Teikyo University School of Medicine, Tokyo, Japan
| | - Masanori Yamamoto
- Department of Cardiology, Toyohashi Heart Center, Toyohashi, Japan
- Department of Cardiology, Nagoya Heart Center, Nagoya, Japan
- Department of Cardiology, Gifu Heart Center, Gifu, Japan
| | - Kentaro Hayashida
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
| | - the OCEAN-TAVI Investigators
- Department of Cardiology, Keio University School of Medicine, Tokyo, Japan
- Department of Cardiology, Saiseikai Utsunomiya Hospital, Tochigi, Japan
- Department of Cardiovascular Surgery, Keio University School of Medicine, Tokyo, Japan
- Department of Cardiology, Tokai University School of Medicine, Isehara, Japan
- Department of Cardiology, Tsukuba Medical Center Hospital, Tsukuba, Japan
- Department of Cardiology, St. Marianna University, Tokyo, Japan
- Division of Cardiology, Mitsui Memorial Hospital, Tokyo, Japan
- Department of Cardiology, New Tokyo Hospital, Matsudo, Japan
- Department of Cardiology, Kinki University, Osaka, Japan
- Department of Cardiology, Saiseikai Yokohama-City Eastern Hospital, Tsurumi, Japan
- Department of Cardiology, Sendai Kousei Hospital, Sendai, Japan
- Department of Cardiology, Shonan Kamakura General Hospital, Kamakura, Japan
- Department of Cardiology, Kokura Memorial Hospital, Kokura, Japan
- Department of Cardiology, Tokyo Bay Urayasu Ichikawa Medical Center, Urayasu, Japan
- Department of Cardiology, Toyama University Hospital, Toyama, Japan
- Department of Cardiology, National Cerebral and Cardiovascular Center, Osaka, Japan
- Department of Cardiology, Teikyo University School of Medicine, Tokyo, Japan
- Department of Cardiology, Toyohashi Heart Center, Toyohashi, Japan
- Department of Cardiology, Nagoya Heart Center, Nagoya, Japan
- Department of Cardiology, Gifu Heart Center, Gifu, Japan
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Kitahara H, Kumamaru H, Kohsaka S, Yamashita D, Kanda T, Matsuura K, Shimamura K, Matsumiya G, Kobayashi Y. Clinical Outcomes of Urgent or Emergency Transcatheter Aortic Valve Implantation - Insights From the Nationwide Registry of Japan Transcatheter Valve Therapies. Circ J 2024; 88:439-447. [PMID: 36575039 DOI: 10.1253/circj.cj-22-0536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Limited data are available for clinical outcomes in patients who underwent urgent or emergency transcatheter aortic valve implantation (TAVI). This study investigated in-hospital and 1-year outcomes and explored prognostic covariates in urgent/emergency TAVI using nationwide registry data.Methods and Results: Among 26,775 patients who underwent TAVI between August 2013 and December 2019, 25,495 with 1-year follow-up information were analyzed in this study. Baseline and procedural characteristics, as well as clinical adverse events, were compared between the urgent/emergency and elective TAVI groups. The primary outcome was all-cause mortality within 1 year after TAVI. Multivariable Cox regression models were constructed to identify independent predictors after urgent or emergency TAVI. Urgent or emergency TAVI was performed in 578 (2.3%) patients. The Society of Thoracic Surgeons score was significantly higher in the urgent/emergency than elective TAVI group (13.3% vs. 6.0%; P<0.001). Device success rate was comparable between the 2 groups. All-cause death-free survival within 1 year was lower in the urgent/emergency than elective TAVI group (77.2% vs. 92.2%; log rank P<0.001). Malignancy, albumin and creatinine concentrations, ejection fraction, and mean pressure gradient were associated with 1-year mortality in the urgent/emergency TAVI group. CONCLUSIONS Despite higher surgical risk and more comorbidities, the procedure was successfully performed in patients undergoing urgent/emergency TAVI, although it should be noted that prognosis was worse than for elective TAVI.
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Affiliation(s)
- Hideki Kitahara
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine
| | - Hiraku Kumamaru
- Department of Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo
| | - Shun Kohsaka
- Department of Cardiology, Keio University School of Medicine
| | - Daichi Yamashita
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine
| | - Tomoyoshi Kanda
- Department of Cardiovascular Surgery, Chiba University Graduate School of Medicine
| | - Kaoru Matsuura
- Department of Cardiovascular Surgery, Chiba University Graduate School of Medicine
| | - Kazuo Shimamura
- Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine
| | - Goro Matsumiya
- Department of Cardiovascular Surgery, Chiba University Graduate School of Medicine
| | - Yoshio Kobayashi
- Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine
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Koga M, Izumo M, Kobayashi Y, Kai T, Okuno T, Sato Y, Kuwata S, Okuyama K, Ishibashi Y, Tanabe Y, Akashi YJ. Safety and feasibility of zero-contrast transcatheter aortic valve implantation using balloon-expandable valves in patients with aortic stenosis and severe renal impairment: A single-center study. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2024; 58:68-76. [PMID: 37500393 DOI: 10.1016/j.carrev.2023.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/23/2023] [Accepted: 07/19/2023] [Indexed: 07/29/2023]
Abstract
BACKGROUND Aortic stenosis (AS) and chronic kidney disease (CKD) can coexist. Repeat exposure to contrast media in patients undergoing transcatheter aortic valve implantation (TAVI) has latent mortality risks and increased risk for acute kidney injury. We aimed to assess our "zero-contrast TAVI" protocol for patients with advanced CKD. METHODS Consecutive patients with severe AS who underwent TAVI at a single center registry were enrolled. Zero-contrast TAVI group included patients who underwent TAVI without contrast and who had an estimated glomerular filtration rate <30 mL/min/1.73 m2. Conventional TAVI group included patients who underwent the regular TAVI procedure. Patients using balloon-expandable valves via transfemoral approach were analyzed. Baseline clinical and procedural characteristics and clinical outcomes were compared between two groups. The primary outcome was early safety as defined by Valve Academic Research Consortium Criteria. Secondary outcomes included the presence of severe prosthesis-patient mismatch, moderate or greater perivalvular leakage, and requirement for new dialysis (within 3 months). RESULTS A total of 520 patients were analyzed. Among these, 32 (6 %) underwent zero-contrast TAVI and 488 (94 %) conventional TAVI. In the zero-contrast TAVI group, 12 patients (37.5 %) had to use 20.7 (11.0-31.2) mL of contrast media. There were no significant differences in the primary and secondary outcomes between zero-contrast TAVI and conventional TAVI groups (78.1 % vs. 86.8 %, P = 0.184 and 9.4 % vs. 8.1 %, P = 0.738 for the primary and secondary outcomes, respectively). CONCLUSIONS Zero-contrast TAVI is feasible, safe, and effective in patients with AS and stage 4 CKD.
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Affiliation(s)
- Masashi Koga
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan.
| | - Masaki Izumo
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Yoshikuni Kobayashi
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Takahiko Kai
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Taishi Okuno
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Yukio Sato
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Shingo Kuwata
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Kazuaki Okuyama
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Yuki Ishibashi
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Yasuhiro Tanabe
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
| | - Yoshihiro J Akashi
- Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Japan
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Tanaka K, Mii S, Ishida M, Guntani A, Yamashita S, Kurose S, Okazaki J, Kawakubo E. Experience of Balloon Aortic Valvuloplasty for Severe Aortic Stenosis in Patients Scheduled for Open Surgery for Chronic Limb-Threatening Ischemia. Ann Vasc Dis 2023; 16:108-114. [PMID: 37359102 PMCID: PMC10288117 DOI: 10.3400/avd.oa.22-00131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 03/14/2023] [Indexed: 06/28/2023] Open
Abstract
Objectives: To estimate the effectiveness of balloon aortic valvuloplasty (BAV) for severe aortic stenosis (SAS) in patients scheduled for open surgery for chronic limb-threatening ischemia. Materials and Methods: Clinical data of patients from 2012 to 2018 were retrieved and summarized. The early outcomes and survival after BAV and open bypass were retrospectively investigated. Results: BAV was performed on seven dialysis patients. One patient died of mesenteric infarction 3 days after BAV; however, six patients were able to undergo open bypass at an average of 10 days (7-19 days) after BAV. One patient died of hemorrhagic shock before the wound healed; five patients underwent limb salvage. Four of these five patients could not undergo surgical aortic open valve replacement owing to advanced age or poor cardiac function and died within 2 years. Only one patient who underwent radical surgery after a bypass survived more than 4 years. Conclusion: BAV enabled open surgery and limb salvage in patients with SAS. Although BAV alone cannot ensure long-term survival, the procedure will continue to be important as a bridge technique to radical surgery, such as transcatheter aortic valve implantation and aortic valve repair, which are often avoided owing to infection.
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Affiliation(s)
- Kiyoshi Tanaka
- Department of Vascular Surgery, Kokura Memorial Hospital, Kitakyushu, Fukuoka, Japan
| | - Shinsuke Mii
- Department of Vascular Surgery, Saiseikai Yahata General Hospital, Kitakyushu, Fukuoka, Japan
| | - Masaru Ishida
- Department of Vascular Surgery, Steel Memorial Yawata Hospital, Kitakyushu, Fukuoka, Japan
| | - Atsushi Guntani
- Department of Vascular Surgery, Saiseikai Yahata General Hospital, Kitakyushu, Fukuoka, Japan
| | - Sho Yamashita
- Department of Vascular Surgery, Saiseikai Yahata General Hospital, Kitakyushu, Fukuoka, Japan
| | - Shun Kurose
- Department of Vascular Surgery, Kokura Memorial Hospital, Kitakyushu, Fukuoka, Japan
| | - Jin Okazaki
- Department of Vascular Surgery, Kokura Memorial Hospital, Kitakyushu, Fukuoka, Japan
| | - Eisuke Kawakubo
- Department of Surgery, Fukuoka City Hospital, Fukuoka, Fukuoka, Japan
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5
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Nübel J, Hoffmeister M, Labrenz O, Jost K, Oess S, Hauptmann M, Schön J, Fritz G, Haase M, Butter C, Haase-Fielitz A. NT-proBNP/urine hepcidin-25 ratio and cardiorenal syndrome type 1 in patients with severe symptomatic aortic stenosis. Biomark Med 2023; 17:475-485. [PMID: 37675894 DOI: 10.2217/bmm-2023-0034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023] Open
Abstract
Background: This study aimed to determine whether novel and conventional cardiorenal biomarkers in patients before transcatheter aortic valve implantation may be associated with cardiorenal syndrome (CRS) type 1. Methods: Serum NT-proBNP and urine biomarkers (hepcidin-25, NGAL, IL-6) were measured before and 24 h after transcatheter aortic valve implantation. Results: 16/95 patients had CRS type 1. Those patients had longer length of stay in hospital (12.5 [9.0-16.0] vs 9.0 [8-12] days; p = 0.025) and were more frequently readmitted to hospital within 6 months after discharge (46.7 vs 15.6%; odds ratio: 4.7; 95% CI: 1.5-15.5; p = 0.007). The NT-proBNP/urine hepcidin-25 ratio (odds ratio: 2.89; 95% CI: 1.30-6.41; p = 0.009) was an independent modifier of CRS type 1. Conclusion: The NT-proBNP/urine hepcidin-25 ratio appears to be a modifier of risk of CRS type 1.
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Affiliation(s)
- Jonathan Nübel
- Department of Cardiology, University Hospital Heart Centre Brandenburg & Faculty of Health Sciences Brandenburg, Brandenburg Medical School (MHB), Bernau, 16321, Germany
| | - Meike Hoffmeister
- Institute of Biochemistry, Brandenburg Medical School (MHB), Brandenburg, 14770, Germany
- Faculty of Health Sciences (FGW), Joint Faculty of the University of Potsdam, the Brandenburg Medical School & the Brandenburg Technical University Cottbus-Senftenberg, Cottbus, Germany
| | - Oliver Labrenz
- Department of Psychology, University Hospital Ruppin-Brandenburg, Brandenburg Medical School (MHB), Neuruppin, 16816, Germany
| | - Kerstin Jost
- Department of Psychology, University Hospital Ruppin-Brandenburg, Brandenburg Medical School (MHB), Neuruppin, 16816, Germany
| | - Stefanie Oess
- Institute of Biochemistry, Brandenburg Medical School (MHB), Brandenburg, 14770, Germany
- Faculty of Health Sciences (FGW), Joint Faculty of the University of Potsdam, the Brandenburg Medical School & the Brandenburg Technical University Cottbus-Senftenberg, Cottbus, Germany
| | - Michael Hauptmann
- Faculty of Health Sciences (FGW), Joint Faculty of the University of Potsdam, the Brandenburg Medical School & the Brandenburg Technical University Cottbus-Senftenberg, Cottbus, Germany
- Institute of Biostatistics & Registry Research, Brandenburg Medical School (MHB), Neuruppin, 16816, Germany
| | - Julika Schön
- Anesthesia & Intensive Care, University Hospital Ruppin-Brandenburg, Brandenburg Medical School (MHB), Neuruppin, 16816, Germany
| | - Georg Fritz
- Department of Anesthesiology, Intensive Care & Pain Therapy, University Hospital Heart Centre Brandenburg, Brandenburg Medical School (MHB), Bernau, 16321, Germany
| | - Michael Haase
- Diamedikum Kidney Care Centre, Potsdam, 14473, Germany
- Department of Nephrology & Hypertension, Hannover Medical School, Hannover, 30625, Germany
- Institute of Social Medicine & Health System Research, Otto von Guericke University Magdeburg, Magdeburg, 39120, Germany
| | - Christian Butter
- Department of Cardiology, University Hospital Heart Centre Brandenburg & Faculty of Health Sciences Brandenburg, Brandenburg Medical School (MHB), Bernau, 16321, Germany
- Faculty of Health Sciences (FGW), Joint Faculty of the University of Potsdam, the Brandenburg Medical School & the Brandenburg Technical University Cottbus-Senftenberg, Cottbus, Germany
| | - Anja Haase-Fielitz
- Department of Cardiology, University Hospital Heart Centre Brandenburg & Faculty of Health Sciences Brandenburg, Brandenburg Medical School (MHB), Bernau, 16321, Germany
- Faculty of Health Sciences (FGW), Joint Faculty of the University of Potsdam, the Brandenburg Medical School & the Brandenburg Technical University Cottbus-Senftenberg, Cottbus, Germany
- Institute of Social Medicine & Health System Research, Otto von Guericke University Magdeburg, Magdeburg, 39120, Germany
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Tobe A, Tanaka A, Tokuda Y, Shirai Y, Miyazaki T, Yuhara S, Akita S, Furusawa K, Ishii H, Mutsuga M, Murohara T. Impact of Albuminuria on the Prognosis After Transcatheter Aortic Valve Implantation. Am J Cardiol 2023; 186:156-162. [PMID: 36280473 DOI: 10.1016/j.amjcard.2022.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/06/2022] [Accepted: 09/26/2022] [Indexed: 11/01/2022]
Abstract
The impact of preoperative albuminuria on the prognosis after transcatheter aortic valve implantation (TAVI) has not been studied. A total of 228 patients who underwent TAVI for severe aortic stenosis (AS) and for whom preoperative urinary data was available were retrospectively investigated. Patients were divided into two groups according to the urinary albumin-to-creatinine ratio (ACR): high (ACR≥ 30 mg/g) and low (ACR<30 mg/g). The urinary total protein-to-creatinine ratio (PCR) and dipstick proteinuria were also evaluated. The primary outcome was the composite outcome of all-cause death and readmission for heart failure. In total, 117 patients had a high ACR and 111 patients had a low ACR. During the median follow-up period of 467 days, patients with a high ACR had a higher incidence of the primary outcome than those with a low ACR (p<0.001). Patients with a high PCR or positive dipstick proteinuria were also at a higher risk for the primary outcome (p<0.001 and p=0.008, respectively). Multivariable Cox proportional hazards analysis showed a high ACR was independently associated with a primary outcome (hazard ratio, 4.98; 95% confidence interval, 1.84-13.49; p=0.002). In conclusion, preoperative albuminuria is an independent predictor of cardiac events in patients with severe AS undergoing TAVI.
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Affiliation(s)
- Akihiro Tobe
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
| | - Akihito Tanaka
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoshiyuki Tokuda
- Department of Cardiac Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoshinori Shirai
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Tatsuya Miyazaki
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Satoshi Yuhara
- Department of Cardiac Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Sho Akita
- Department of Cardiac Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kenji Furusawa
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hideki Ishii
- Department of Cardiology, Gunma University Graduate School of Medicine, Maebashi, Japan
| | - Masato Mutsuga
- Department of Cardiac Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
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