1
|
Yamazoe S, Imai H, Ogawa Y, Kano N, Murase Y, Mamiya K, Ikeda T, Hiramatsu K, Torii J, Kawaguchi K. The effect of off-label use of reduced-dose direct oral anticoagulants therapy in the treatment of pulmonary embolism comparable to standard-dose therapy. Heart Vessels 2024; 39:365-372. [PMID: 38381170 PMCID: PMC10920432 DOI: 10.1007/s00380-023-02339-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 11/08/2023] [Indexed: 02/22/2024]
Abstract
Direct oral anticoagulants (DOACs) have been shown to be effective and safe in preventing pulmonary embolism recurrence. In this single-center retrospective observational study, we aimed to evaluate the efficacy and safety of reduced-dose DOACs in 86 consecutive patients with acute pulmonary embolism. Patients were divided into standard-dose and reduced-dose DOACs groups. Initial clot volume did not significantly differ between the two groups (standard-dose DOACs vs. reduced-dose DOACs, 18.8 [Q1-Q3 7.3-30.8] mL vs. 10.0 [Q1-Q3 3.2-27.9] mL, p = 0.1). Follow-up computed tomography (CT) within 30 days showed a higher rate of clot volume reduction or disappearance in the standard-dose group compared to the reduced-dose group (standard-dose DOACs vs. reduced-dose DOACs, 81.6% vs. 53.9%, p = 0.02). However, at the final follow-up CT, there was no significant difference in clot volume change between the two groups (standard-dose DOACs vs. reduced-dose DOACs, 91.5% vs. 82.0%, p = 0.19). Major bleeding occurred in two patients in the standard-dose group (4.3%) and three patients in the reduced-dose DOACs group (7.7%) (p = 0.5). In conclusion, while standard-dose DOACs demonstrated superior efficacy in early clot reduction, reduced doses of apixaban and edoxaban showed comparable efficacy and safety profiles in long-term treatment of acute pulmonary embolism in certain patients.
Collapse
Affiliation(s)
- Shinji Yamazoe
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Hajime Imai
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan.
| | - Yasuhiro Ogawa
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Naoaki Kano
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Yosuke Murase
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Keita Mamiya
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Tomoyo Ikeda
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Kei Hiramatsu
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Jun Torii
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Katsuhiro Kawaguchi
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| |
Collapse
|
2
|
Murase Y, Igawa O, Imai H, Ogawa Y, Kano N, Mamiya K, Ikeda T, Miyamae K, Yamazoe S, Torii J, Yamanaka K, Kato T, Kawaguchi K, Kawaguchi K. Histopathological characteristics of the arrhythmogenic right ventricular cardiomyopathy presenting the electrocardiographic characteristics with Brugada syndrome. J Cardiovasc Electrophysiol 2023; 34:2006-2009. [PMID: 37554112 DOI: 10.1111/jce.16037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 07/16/2023] [Accepted: 08/01/2023] [Indexed: 08/10/2023]
Abstract
INTRODUCTION The histopathological characteristics of the overlapping disease states of Brugada syndrome (BrS) and arrhythmogenic right ventricular cardiomyopathy (ARVC) have not been fully elucidated. METHODS A 71-year-old man showed coved-type ST-segment elevation with the right precordial leads, and the echocardiography demonstrated right ventricular (RV) dilatation. After 11 months, he died of a polymorphic VT storm. RESULTS The pathological tissue demonstrated fibrofatty degeneration in the free wall of the RV outflow tract based on the heart autopsy. CONCLUSION The overlapping disease states of BrS and ARVC showed histopathological characteristics consistent with ARVC.
Collapse
Affiliation(s)
- Yosuke Murase
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Osamu Igawa
- Department of Cardiovascular Medicine, Nippon Medical School, Tokyo, Japan
| | - Hajime Imai
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Yasuhiro Ogawa
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Naoaki Kano
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Keita Mamiya
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Tomoyo Ikeda
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Kiichi Miyamae
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Shinji Yamazoe
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Jun Torii
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Kazuyuki Yamanaka
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Toshimasa Kato
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | - Kenta Kawaguchi
- Department of Cardiology, Komaki City Hospital, Komaki, Aichi, Japan
| | | |
Collapse
|
3
|
Miyamae K, Murase Y, Ogawa Y, Imai H, Kano N, Mamiya K, Ikeda T, Yamazoe S, Torii J, Yamanaka K, Kawaguchi K. Radiofrequency Ablation of Re-entrant Atrial Tachycardia Originating from the Superior Vena Cava with a High-resolution, 3-dimensional Mapping System. J Innov Card Rhythm Manag 2023; 14:5546-5551. [PMID: 38059260 PMCID: PMC10697111 DOI: 10.19102/icrm.2023.14083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/01/2023] [Indexed: 12/08/2023] Open
Abstract
An 80-year-old man with no previous history of catheter ablation or cardiac surgery underwent catheter ablation for atrial tachycardia (AT). We suspected that the mechanism causing AT was re-entry indicated by the entrainment phenomenon during AT and through activation mapping with a 3-dimensional mapping system (EnSite™ X EP system; Abbott, Chicago, IL, USA). We used a multipolar catheter (Advisor™ HD Grid Mapping Catheter; Abbott) inserted into the superior vena cava (SVC) to accomplish activation mapping. The AT circuit was localized inside the SVC with a fractionated potential recorded on its right lateral wall. A similar fractionated potential was observed in the surrounding area. These areas functioned as the critical isthmus of the AT. Radiofrequency (RF) catheter ablation at these sites eliminated the tachycardia. After RF delivery, no tachycardia was induced by programmed stimulation, even during isoproterenol infusion. Consequently, there was no recurrence of tachycardia even after catheter ablation.
Collapse
Affiliation(s)
- Kiichi Miyamae
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Yosuke Murase
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Yasuhiro Ogawa
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Hajime Imai
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Naoaki Kano
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Keita Mamiya
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Tomoyo Ikeda
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Shinji Yamazoe
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Jun Torii
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | | | | |
Collapse
|
4
|
Yanagisawa S, Suzuki H, Kanzaki Y, Ishikawa S, Kamikubo Y, Okumura S, Kato H, Mizutani Y, Murase Y, Nakasuka K, Warita S, Sekimoto S, Takemoto Y, Takasugi N, Ohguchi S, Senga M, Yokoi K, Shibata R, Inden Y, Murohara T. Efficacy and feasibility of cryoballoon ablation for atrial fibrillation in patients with heart failure: A large-scale multicenter study. J Cardiovasc Electrophysiol 2022; 33:2447-2464. [PMID: 36168875 DOI: 10.1111/jce.15691] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 09/01/2022] [Accepted: 09/05/2022] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Data are limited regarding outcomes of cryoballoon ablation for atrial fibrillation (AF) in patients with heart failure (HF). This large-scale multicenter study aimed to evaluate the prognosis of patients with HF after cryoballoon ablation for AF. METHODS Among 3655 patients undergoing cryoballoon ablation at 17 institutions, 549 patients (15%) (391 with paroxysmal AF and 158 with persistent AF) diagnosed with HF preoperatively were analyzed. Clinical endpoints were recurrence, mortality, and HF hospitalization after ablation. RESULTS Most patients had a preserved left ventricular ejection fraction (LVEF) ≥ 50%. During a mean follow-up period of 25.7 months, recurrence, all-cause death, and HF hospitalization occurred in 29%, 4.0%, and 4.8%, respectively. Cardiac function on echocardiography and B-type natriuretic peptide (BNP) levels significantly improved postoperatively, and the effect was more pronounced in the nonrecurrence group. Major complications occurred in 33 patients (6.0%), but most complications were phrenic nerve palsy (3.6%). Although death and HF hospitalization occurred more frequently in patients with LVEF ≤ 40% (n = 73) and New York Heart Association (NYHA) class III-IV (n = 19) than other subgroups, the BNP levels, and LVEF significantly improved after ablation in all LVEF and NYHA class subgroups. High BNP levels, NHYA class, CHADS2 score, and structural heart disease, but not postablation recurrence, independently predicted death, and HF hospitalization on multivariate analysis. The patients with tachycardia-induced cardiomyopathy had better recovery of BNP levels and LVEF after ablation than those with structural heart disease. CONCLUSIONS Cryoballoon ablation for AF in HF patients is feasible and leads to significantly improved cardiac function.
Collapse
Affiliation(s)
- Satoshi Yanagisawa
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hirohiko Suzuki
- Department of Cardiology, Japanese Red Cross Aichi Medical Center Nagoya Daini Hospital, Nagoya, Japan
| | - Yasunori Kanzaki
- Department of Cardiology, Ogaki Municipal Hospital, Ogaki, Japan
| | - Shinji Ishikawa
- Department of Cardiology, Cardiovascular Center, Anjo Kosei Hospital, Anjo, Japan
| | - Yosuke Kamikubo
- Department of Cardiology, Toyota Memorial Hospital, Toyota, Japan
| | - Satoshi Okumura
- Department of Cardiology, Konan Kosei Hospital, Konan, Japan
| | - Hiroyuki Kato
- Division of Cardiology, Japan Community Healthcare Organization Chukyo Hospital, Nagoya, Japan
| | - Yoshiaki Mizutani
- Department of Cardiology, Yokkaichi Municipal Hospital, Yokkaichi, Japan
| | - Yosuke Murase
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Kosuke Nakasuka
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shunichiro Warita
- Department of Cardiology, Gifu Prefectural General Medical Center, Gifu, Japan
| | - Satoru Sekimoto
- Department of Cardiology, Nagoya City University East Medical Center, Nagoya, Japan
| | - Yoshio Takemoto
- Department of Cardiology, Gifu Prefectural Tajimi Hospital, Tajimi, Japan
| | - Nobuhiro Takasugi
- Division of Cardiovascular Medicine, Gifu University Hospital, Gifu, Japan
| | - Shiou Ohguchi
- Department of Cardiology, Kasugai Municipal Hospital, Kasugai, Japan
| | - Michiharu Senga
- Department of Cardiology, Kuwana City Medical Center, Kuwana, Japan
| | | | - Rei Shibata
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
5
|
Okajima T, Inden Y, Yanagisawa S, Imai H, Murase Y, Ogawa Y, Kawaguchi K, Murohara T. Short coupling interval with high burden of atrial ectopy predicts recurrence after atrial fibrillation ablation. Heart Vessels 2021; 37:775-787. [PMID: 34705091 DOI: 10.1007/s00380-021-01966-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/08/2021] [Indexed: 11/24/2022]
Abstract
Atrial ectopy (AE) with a short coupling interval (S-AE) causes atrial fibrillation (AF). A higher burden of AE is associated with recurrence after AF ablation. However, a few reports have evaluated the prognostic impact of both AE burden and S-AE after the acute phase of ablation. This study aimed to assess the characteristics of AE beyond the blanking period in predicting the recurrence. We retrospectively analyzed 173 patients who underwent first catheter ablation for AF and 24-h Holter recording following a 3-month blanking period. AE was defined as a narrow QRS complex occurring < 75% earlier than the prior reference R-R interval. We investigated the relationship between the AE's characteristics in Holter recordings and atrial arrhythmia recurrence. Forty-two patients (24%) had a recurrence during a median 488-day follow-up. Patients with S-AE (minimum coupling interval ratio of AE ≤ 45%) had a higher recurrence rate than those without S-AE (44.9% vs. 16.1%, p < 0.001). Moreover, patients with AE ≥ 241/day exhibited a significantly higher recurrence rate than those with AE < 241/day (44.3% vs. 10.7%, p < 0.001). In multivariate analysis, S-AE with a higher AE burden was an independent predictor of recurrence (hazard ratio 5.82, 95% confidence interval: 2.64-12.82, p < 0.001). Kaplan-Meier analysis showed that patients with S-AE and a higher AE burden had the worst prognosis for recurrence (p < 0.001). The combination of a higher AE burden with S-AE could be an efficient predictor of recurrence. These results can help to develop follow-up strategies after AF ablation.
Collapse
Affiliation(s)
- Takashi Okajima
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan.,Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan.
| | - Satoshi Yanagisawa
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Hajime Imai
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Yosuke Murase
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | - Yasuhiro Ogawa
- Department of Cardiology, Komaki City Hospital, Komaki, Japan
| | | | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| |
Collapse
|
6
|
Murase Y, Imai H, Ogawa Y, Kano N, Mamiya K, Ikeda T, Okabe K, Arai K, Yamazoe S, Torii J, Kawaguchi K. Usefulness of P-wave duration in patients with sick sinus syndrome as a predictor of atrial fibrillation. J Arrhythm 2021; 37:1220-1226. [PMID: 34621420 PMCID: PMC8485803 DOI: 10.1002/joa3.12604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 06/23/2021] [Accepted: 07/06/2021] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND This study aimed to clarify P-wave duration (PWD) ability before pacemaker implantation to predict worsening atrial fibrillation (AF) burden after the procedure. METHODS We retrospectively investigated 75 patients who underwent permanent pacemaker implantation due to sick sinus syndrome (SSS) at Komaki City Hospital between January 2006 and May 2019. Worsening AF burden was defined as an increase in the number of AF episodes, each lasting ≥5.5 hours a day. RESULTS In the study population, 17 patients (23%) had worsening AF burden during the follow-up period. These patients had significantly longer PWD in lead Ⅱ (117.9 ± 19.9 ms vs 101.3 ± 20.0 ms, P = .002) than the patients without worsening AF burden. The best discriminative cutoff value for PWD in lead Ⅱ was 108 ms (sensitivity, 77%; specificity, 67%). In multivariate analysis, PWD in lead II ≥108 ms (hazard ratio, 5.395; 95% confidence interval, 1.352-21.523; P = .017) was an independent predictor of worsening AF burden. Patients with PWD in lead II <108 ms showed a significantly higher event-free rate against worsening AF burden than those with PWD in lead II ≥108 ms (81% vs 9%, P = .005). CONCLUSIONS Prolonged PWD before pacemaker implantation was the most important independent predictor of worsening AF burden after the procedure. In patients with SSS, prolonged PWD can be a useful marker for predicting worsening of AF burden after pacemaker implantation.
Collapse
Affiliation(s)
- Yosuke Murase
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Hajime Imai
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Yasuhiro Ogawa
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Naoaki Kano
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Keita Mamiya
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Tomoyo Ikeda
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Kei Okabe
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Kenji Arai
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Shinji Yamazoe
- Department of Cardiology Komaki City Hospital Komaki Japan
| | - Jun Torii
- Department of Cardiology Komaki City Hospital Komaki Japan
| | | |
Collapse
|
7
|
Murase Y, Takeichi T, Tanahashi K, Marumo Y, Suzuki Y, Nakamura S, Akiyama M. Cutaneous extramedullary hematopoiesis in a patient with secondary myelofibrosis due to MPL gene mutation. J Eur Acad Dermatol Venereol 2020; 35:e257-e259. [PMID: 33043481 DOI: 10.1111/jdv.16990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y Murase
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - T Takeichi
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - K Tanahashi
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Y Marumo
- Department of Hematology and Oncology, Nagoya Memorial Hospital, Nagoya, Japan
| | - Y Suzuki
- Department of Pathology and Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - S Nakamura
- Department of Pathology, Handa City Hospital, Handa, Japan
| | - M Akiyama
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
8
|
Okajima T, Imai H, Murase Y, Kano N, Ogawa Y, Kawaguchi K. Short coupling with high burden of atrial ectopy in twenty-four hour holter recording predicts recurrence of atrial arrhythmia after atrial fibrillation ablation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Atrial arrhythmia recurrence is experienced in up to 20% of patients after initially receiving a catheter ablation for atrial fibrillation (AF). Therefore, it is important to define predictors of atrial arrhythmia recurrence. Atrial ectopy (AE) with short coupling interval (S-AE) has been reported to be a trigger of AF. On the other hand, high burden of AE has been reported to be a useful predictor of atrial arrhythmia recurrences after AF ablation. Thus, the combination of the incidence of S-AE and AE burden during a 24-hour Holter recording could be a useful predictor of atrial arrhythmia recurrence after AF ablation.
Purpose
To investigate this hypothesis, we performed a retrospective case-controlled study.
Methods
We enrolled 180 patients who underwent their first catheter ablation procedure for AF and performed a 24-hour Holter recording between 90 to 365 days after their ablation procedure. Patients who performed an additional ablation procedure before the Holter recording were excluded. Finally, we analyzed 173 patients (age: 65±10 years, female: 28.3%, non-paroxysmal: 27.7%). The Holter recordings were analyzed by the same experienced technicians. We defined AE as a narrow QRS complex occurring >25% than prior R-R interval, and S-AE as AE occurring >55% earlier than expected. The relationship between the characteristics of AE during the Holter recording and atrial arrhythmia recurrences was investigated.
Results
The Holter recordings were performed at a median of 103 (IQR: 98–138) days after ablation. The median number of AE were 144 (IQR: 54–699) beats per day, and S-AE was recorded in 49 patients (28.3%). Forty-two patients (24.3%) had a recurrence of atrial arrhythmia during a median 488-day follow up period. Patients with S-AE had a recurrence of atrial arrhythmia more frequently than those without S-AE (44.9% vs 16.1%, p<0.001). We found the cut-off point of AE burden as 241 beats per day by the receiver operating characteristic curve with 74% sensitivity and 70% specificity to predict atrial arrhythmia recurrence. We divided the patients into four groups according to the presence or absence of S-AE and high AE burden. In the Kaplan-Meier analysis, patients with S-AE and high AE burden had the highest atrial arrhythmia recurrence rate (Log-rank test: p<0.001). In the Cox multivariate analysis, S-AE with high AE burden was an independent predictor of atrial arrhythmia recurrence (HR: 4.27, 95% CI: 2.32–7.85, p<0.001).
Conclusion
For AF patients who underwent their first catheter ablation, S-AE (>55% earlier than expected) with high AE burden (>241 beats per day) during the 24-hour Holter recording predicted recurrences of atrial arrhythmia. These results can help to develop follow-up strategies after AF ablation.
Funding Acknowledgement
Type of funding source: None
Collapse
Affiliation(s)
| | - H Imai
- Komaki City Hospital, Komaki, Japan
| | - Y Murase
- Komaki City Hospital, Komaki, Japan
| | - N Kano
- Komaki City Hospital, Komaki, Japan
| | - Y Ogawa
- Komaki City Hospital, Komaki, Japan
| | | |
Collapse
|
9
|
Okajima T, Imai H, Murase Y, Ogawa Y, Kawaguchi K. The efficacy of radiofrequency catheter ablation for menstruation-dependent incessant ventricular tachycardia: A case report. HeartRhythm Case Rep 2019; 6:158-162. [PMID: 32181136 PMCID: PMC7064799 DOI: 10.1016/j.hrcr.2019.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Affiliation(s)
| | | | - Yosuke Murase
- Address reprint requests and correspondence: Dr Yosuke Murase, Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan.
| | | | | |
Collapse
|
10
|
Yanagisawa S, Inden Y, Kato H, Suzuki H, Fujita M, Ishikawa S, Kanzaki Y, Kamikubo Y, Murase Y, Murohara T, Shibata R. Study design and protocol for evaluating the long-term prognosis of patients receiving his bundle pacing: A multicenter observational study. J Arrhythm 2019; 35:760-765. [PMID: 31624518 PMCID: PMC6787332 DOI: 10.1002/joa3.12229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 07/31/2019] [Accepted: 08/07/2019] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND His bundle pacing (HBP) is a recently developed pacing technique that can achieve an ideal physiological pattern of ventricular activation via stimulation of the native His-Purkinje system. Despite the widespread introduction of HBP in clinical practice, its appropriate indications are yet to be determined clearly. Moreover, the efficacy and safety of HBP and long-term prognosis of patients undergoing such are unknown. METHODS We conducted a multicenter observational prospective study in patients undergoing HBP in Japan. Patients with atrioventricular block or conduction delay and estimated ventricular pacing of ≥ 40% scheduled for HBP implantation are included. All patients are followed up until 3 years after the implantation. The primary endpoints are all-cause death, heart failure-related hospitalization, and upgrade to cardiac resynchronization therapy. The secondary endpoint is changes in cardiac function based on echocardiographic findings and laboratory data after the implantation. RESULTS The results are currently under investigation. CONCLUSIONS This multicenter observational study evaluates the long-term prognosis and changes in cardiac function of patients undergoing HBP implantation in a clinical setting. Considering the large number of patients included, the cumulative results would be helpful in establishing evidence on HBP application in this area and consequently allow accurate management and treatment of patients undergoing HBP.
Collapse
Affiliation(s)
- Satoshi Yanagisawa
- Department of Advanced Cardiovascular TherapeuticsNagoya University Graduate School of MedicineNagoyaJapan
| | - Yasuya Inden
- Department of CardiologyNagoya University Graduate School of MedicineNagoyaJapan
| | - Hiroyuki Kato
- Division of CardiologyJapan Community Healthcare Organization Chukyo HospitalNagoyaJapan
| | - Hirohiko Suzuki
- Department of Cardiology, Cardiovascular CenterNagoya Daini Red Cross HospitalNagoyaJapan
| | - Masaya Fujita
- Department of CardiologyToyota Kosei HospitalToyotaJapan
| | - Shinji Ishikawa
- Department of Cardiology, Cardiovascular CenterAnjo Kosei HospitalAnjoJapan
| | | | | | - Yosuke Murase
- Department of CardiologyKomaki City HospitalKomakiJapan
| | - Toyoaki Murohara
- Department of CardiologyNagoya University Graduate School of MedicineNagoyaJapan
| | - Rei Shibata
- Department of Advanced Cardiovascular TherapeuticsNagoya University Graduate School of MedicineNagoyaJapan
| |
Collapse
|
11
|
Watanabe K, Jesmin S, Murase Y, Takeda T, Shiraki T, Sengoku Y. Effects of Repetitive Altitude Training on Salivary Immunoglobulin A Secretion in Collegiate Swimmers. J Clin Med Res 2019; 11:550-555. [PMID: 31413766 PMCID: PMC6681853 DOI: 10.14740/jocmr3884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Accepted: 07/08/2019] [Indexed: 12/03/2022] Open
Abstract
Background Altitude training has often been conducted just before main competition games in many sports. An increase in the frequency of upper respiratory tract infections and gastrointestinal infections due to an altitude-induced suppression of the immune system has been reported after altitude training. Salivary secretory immunoglobulin A (SIgA) is the major immunoglobulin of the mucosal immune system. A suppressive effect of heavy training on SIgA has been reported. However, little is known regarding the effects of repetitive altitude training and hypoxic exposure on SIgA. The objective of this study was to evaluate the changes in SIgA in swimmers undergoing repetitive altitude training at 1,900 m. Methods Nine collegiate swimmers who experienced their first altitude training experience (FT group) were compared to nine swimmers who experienced repetitive training (RT group) and non-training subjects (Con group). Saliva was collected before ascent and eight times every 2 days during altitude training. SIgA levels were measured by enzyme-linked immunosorbent assays. Results Compared to the Con group, SIgA levels and the secretion velocity were decreased after ascent and were slowly restored in both the FT and RT groups. The chronological trends in SIgA levels were similar, even though the decline in SIgA levels in the FT group was larger than that in the RT group. Conclusion Altitude training and experience with altitude training may be one of the factors influencing SIgA.
Collapse
Affiliation(s)
- Koichi Watanabe
- Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan
| | - Subrina Jesmin
- Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan
| | - Yosuke Murase
- Sports and Physical Education Center, University of Tsukuba, Ibaraki, Japan
| | - Tsuyoshi Takeda
- Faculty of Sport Sciences, Waseda University, Saitama, Japan
| | - Takahisa Shiraki
- Coaching Course, Department of Athletic Sport, Biwako Seikei Sport College, Shiga, Japan
| | - Yasuo Sengoku
- Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan
| |
Collapse
|
12
|
Murase Y, Takeichi T, Matsumoto T, Sakakibara A, Akiyama M. A juvenile male case of dermatofibrosarcoma protuberans on the breast. Clin Exp Dermatol 2019; 45:111-113. [PMID: 30820997 DOI: 10.1111/ced.13938] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Y Murase
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - T Takeichi
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - T Matsumoto
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - A Sakakibara
- Division of Dermatology, Anjo Kosei Hospital, Anjo, Japan
| | - M Akiyama
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
13
|
Takenaka M, Inden Y, Yanagisawa S, Fujii A, Ando M, Funabiki J, Murase Y, Otake N, Sakamoto Y, Shibata R, Murohara T. Myocardial viability as shown by left ventricular lead pacing threshold and improved dyssynchrony by QRS narrowing predicts the response to cardiac resynchronization therapy. J Cardiovasc Electrophysiol 2018; 30:311-319. [PMID: 30516312 DOI: 10.1111/jce.13806] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/19/2018] [Accepted: 11/21/2018] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Patients with advanced heart failure and dyssynchrony can benefit from cardiac resynchronization therapy (CRT). To predict the response to CRT, myocardial viability and improved dyssynchrony are suggested to be important. METHODS We retrospectively investigated 93 patients who underwent CRT implantation in Nagoya University Hospital. We assessed QRS narrowing the day after implantation to measure the improvement in dyssynchrony and measured the left ventricular pacing threshold (LVPT) to determine the local myocardial viability in all patients. Responders to CRT were defined as those having a greater than or equal to 15% decrease in left ventricular end-systolic volume by echocardiography at their 6-month follow-up. RESULTS Sixty-two patients (67%) were classified as responders. The QRS width before CRT implantation, QRS narrowing after implantation, left atrial diameter, septal-to-posterior wall motion delay, left ventricular end-diastolic diameter, radial strain, and LVPT were significantly different between the responder and nonresponder groups. On multivariate analysis, QRS narrowing (odds ratio [OR], 1.03; 95% confidence interval [CI], 1.01-1.05; P = 0.005) and LVPT (OR, 0.42; 95% CI, 0.22-0.82; P = 0.011) were independent predictors of a response to CRT. We calculated the cutoff values from the receiver operating characteristic curves as 22.5 milliseconds of QRS narrowing and 1.55 V of LVPT. The response rates in patients with both predictive factors (QRS narrowing ≥ 22.5 milliseconds and LVPT ≤ 1.55 V), one factor, and no factors were 91%, 61%, and 25%, respectively (P < 0.001). CONCLUSION Both myocardial viability and improved electrical dyssynchrony may be essential to predict a good response to CRT.
Collapse
Affiliation(s)
- Masaki Takenaka
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Satoshi Yanagisawa
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Aya Fujii
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Monami Ando
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Junya Funabiki
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yosuke Murase
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Noriaki Otake
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yusuke Sakamoto
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Rei Shibata
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
14
|
Murase Y, Inden Y, Imai H, Kyo S, Yanagisawa S, Fujii A, Sakamoto Y, Tomomatsu T, Murohara T. Clinical significance of the timing of early recurrence of atrial arrhythmia after pulmonary vein isolation: a two-institution clinical study. Heart Vessels 2018; 34:842-850. [PMID: 30390124 DOI: 10.1007/s00380-018-1295-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/26/2018] [Indexed: 11/28/2022]
Abstract
Early recurrence of atrial arrhythmia (ERAA) after ablation frequently occurs, but there is limited evidence about ERAA-timing. This study aimed to investigate the association between ERAA-timing and late recurrence. We retrospectively investigated 332 patients who underwent PVI for paroxysmal atrial fibrillation at Nagoya University Hospital and Komaki City Hospital. Seventy-six patients (23%) had ERAA. The cutoff value of the first ERAA for late recurrence was set as 3 days, with a specificity of 77% and sensitivity of 43%. On multivariate analysis, first ERAA beyond 3 days (hazard ratio, 2.477; 95% confidence interval, 1.168-5.25; p = 0.018) and large left atrial diameter (LAD) (hazard ratio, 1.101; 95% confidence interval, 1.024-1.184; p = 0.009) were independent predictors for late recurrence. Patients who had first ERAA within 3 days and no ERAA beyond 3 days showed a significantly higher recurrence-free rate than those who had first ERAA beyond 3 days and those who had ERAA both within 3 days and beyond 3 days (89% versus 39%, 44%; p < 0.001). Moreover, the patients with ERAA within 3 days and LAD ≤ 37.7 mm showed a significantly higher recurrence-free rate than those with ERAA beyond 3 days and LAD > 37.7 mm, and as compared with the other patients (100% versus 26% and 60%, respectively; p < 0.001). ERAA beyond 3 days after ablation was a predictor for late recurrence. Among patients with ERAA, those with ERAA within 3 days and smaller LAD showed favorable prognosis after ablation.
Collapse
Affiliation(s)
- Yosuke Murase
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan.
| | - Hajime Imai
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Seifuku Kyo
- Department of Cardiology, Komaki City Hospital, 1-20 Joubushi, Komaki, Aichi, 485-8520, Japan
| | - Satoshi Yanagisawa
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Aya Fujii
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Yusuke Sakamoto
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Toshiro Tomomatsu
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| |
Collapse
|
15
|
Anzai T, Aerni R, Wasko M, Mura F, Horikawa SI, Sato SI, Murase Y, Hatakeyama H. FDA SEND process streamlining and implementation – CT-compatible simulated study. Toxicol Lett 2018. [DOI: 10.1016/j.toxlet.2018.06.938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
16
|
Yanagisawa S, Inden Y, Fujii A, Ando M, Funabiki J, Murase Y, Takenaka M, Otake N, Ikai Y, Sakamoto Y, Shibata R, Murohara T. Uninterrupted Direct Oral Anticoagulant and Warfarin Administration in Elderly Patients Undergoing Catheter Ablation for Atrial Fibrillation: A Comparison With Younger Patients. JACC Clin Electrophysiol 2018; 4:592-600. [PMID: 29798785 DOI: 10.1016/j.jacep.2018.02.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/15/2018] [Accepted: 02/16/2018] [Indexed: 01/19/2023]
Abstract
OBJECTIVES The goal of this study was to evaluate the efficacy and safety of uninterrupted direct oral anticoagulant (DOAC) use and uninterrupted warfarin administration in elderly patients undergoing catheter ablation for atrial fibrillation (AF). BACKGROUND There is limited knowledge regarding the uninterrupted use of oral anticoagulant agents in elderly patients undergoing catheter ablation for AF. METHODS This retrospective study included 2,164 patients (n = 325 ≥75 years of age and n = 1,839 <75 years of age) who underwent catheter ablation for AF. All the patients received uninterrupted oral anticoagulant agents during the procedure. We investigated the occurrences of periprocedural events and compared these between the DOAC and warfarin groups of the elderly and younger groups. RESULTS Major bleeding events (3.1% vs. 1.3%; p = 0.023) and minor bleeding events (9.2% vs. 5.0%; p = 0.002), except for thromboembolic events (0% vs. 0.8%; p = 0.248), were significantly higher in the elderly group than in the younger group. No significant differences in thromboembolic and bleeding events were found between the DOAC and warfarin groups of both the elderly and younger groups. Adverse complications did not differ between the groups after adjustment using propensity score matching analysis. Multivariate analysis revealed that lower body weight (odds ratio: 0.96; p = 0.010) and antiplatelet drug use (odds ratio: 2.21; p = 0.039) were independent predictors of adverse events in the elderly group. CONCLUSIONS The periprocedural bleeding risk during the use of uninterrupted oral anticoagulants was higher in the elderly group than in the younger group. This area needs more attention for these patients in whom caution is required.
Collapse
Affiliation(s)
- Satoshi Yanagisawa
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan.
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Aya Fujii
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Monami Ando
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Junya Funabiki
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yosuke Murase
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masaki Takenaka
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Noriaki Otake
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoshihiro Ikai
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yusuke Sakamoto
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Rei Shibata
- Department of Advanced Cardiovascular Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
17
|
Yanagisawa S, Inden Y, Fujii A, Ando M, Funabiki J, Murase Y, Takenaka M, Otake N, Ikai Y, Sakamoto Y, Shibata R, Murohara T. Renal function and risk of stroke and bleeding in patients undergoing catheter ablation for atrial fibrillation: Comparison between uninterrupted direct oral anticoagulants and warfarin administration. Heart Rhythm 2017; 15:348-354. [PMID: 29107192 DOI: 10.1016/j.hrthm.2017.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Indexed: 01/14/2023]
Abstract
BACKGROUND The effect of uninterrupted oral anticoagulant use in patients with chronic kidney disease (CKD) during catheter ablation for atrial fibrillation (AF) is not fully understood. OBJECTIVE The present study aimed to evaluate the safety and efficacy of periprocedural uninterrupted direct oral anticoagulant (DOAC) use compared with those of uninterrupted warfarin use in patients undergoing catheter ablation for AF stratified by various renal function groups. METHODS A total of 2091 patients were retrospectively included in this study. The study population was divided into 4 groups: creatinine clearance level ≥80 mL/min (n = 1086), 50-79 mL/min (n = 774), 15-49 mL/min (n = 209), and <15 mL/min (n = 22). We investigated periprocedural complications and compared them between uninterrupted DOAC and warfarin groups. RESULTS There was no significant difference in thromboembolic events among the 4 groups (0.6%, 0.6%, 1.0%, and 0%, respectively; P = .792). However, major bleeding events (0.9%, 1.4%, 4.8%, and 4.5%; P < .001) and minor bleeding events (4.1%, 6.1%, 11.5%, and 13.6%; P < .001) primarily occurred in patients with CKD. The rate of periprocedural complications in the DOAC group was similar to that in the warfarin group for each renal function category. Adverse events did not differ after adjustment using propensity score-matched analysis. Multivariate analysis showed that lower body weight, antiplatelet drug use, initial ablation session, and CKD were independent predictors of adverse events. CONCLUSION The periprocedural bleeding risk was increased in patients with CKD. Uninterrupted DOAC and warfarin administration during catheter ablation for AF in patients with CKD is feasible and effective.
Collapse
Affiliation(s)
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Aya Fujii
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Monami Ando
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Junya Funabiki
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yosuke Murase
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masaki Takenaka
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Noriaki Otake
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoshihiro Ikai
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yusuke Sakamoto
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Rei Shibata
- Department of Advanced Cardiovascular Therapeutics, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
18
|
Murase Y, Shimizu K, Tanimura Y, Hanaoka Y, Watanabe K, Kono I, Miyakawa S. Salivary extracellular heat shock protein 70 (eHSP70) levels increase after 59 min of intense exercise and correlate with resting salivary secretory immunoglobulin A (SIgA) levels at rest. Cell Stress Chaperones 2016; 21:261-9. [PMID: 26608509 PMCID: PMC4786527 DOI: 10.1007/s12192-015-0656-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/20/2015] [Accepted: 10/26/2015] [Indexed: 10/25/2022] Open
Abstract
This study aimed to identify the response of a salivary stress protein, extracellular heat shock protein (eHSP70), to intense exercise and to investigate the relationship between salivary eHSP70 and salivary immunoglobulin A (SIgA) levels in response to exercise. Sixteen healthy sedentary young males (means ± SD 23.8 ± 1.5 years, 172.2 ± 6.4 cm, 68.3 ± 7.4 kg) performed 59 min of cycling exercise at 75% VO2max. Saliva and whole blood samples were collected before (Pre), immediately after (Post), and at 1, 2, 3, and 4 h after completion of the exercise (1, 2, 3, and 4 h). The salivary eHSP70 and SIgA levels were measured by enzyme-linked imunosorbent assay (ELISA), and the secretion rates were computed by multiplying the concentration by the saliva flow rate. White blood cells were analyzed using an automated cell counter with a direct-current detection system. The salivary eHSP70 secretion rates were 1.11 ± 0.86, 1.51 ± 1.47, 1.57 ± 1.32, 2.21 ± 2.04, 3.36 ± 2.72, and 6.89 ± 4.02 ng · min(-1) at Pre, Post, and 1, 2, 3, and 4 h, respectively. The salivary eHSP70 secretion rate was significantly higher at 4 h than that at Pre, Post, 1, and 3 h (p < 0.05). The SIgA secretion rates were 26.9 ± 12.6, 20.3 ± 10.4, 19.6 ± 11.0, 21.8 ± 12.8, 21.5 ± 11.9, and 21.9 ± 11.7 μg · min(-1) at Pre, Post, 1, 2, 3, and 4 h, respectively. The salivary SIgA secretion rate was significantly lower between 1 and 4 h than that at Pre (p < 0.05). There was a positive correlation between salivary eHSP70 and SIgA in both concentration and secretion rates before exercise (p < 0.05). The absolute number of white blood cells significantly increased after exercise, with a maximum at 2 h (p < 0.05). The neutrophil/lymphocyte ratio was significantly increased from 1 to 4 h when compared with that in the Pre samples (p < 0.05). The present study revealed that salivary eHSP70 significantly increased at 4 h after the 59 min of intense exercise in sedentary male subjects. Exercise stress can induce elevated salivary eHSP70 level and upregulate oral immune function partially.
Collapse
Affiliation(s)
- Yosuke Murase
- Department of Health Care and Sports, Faculty of Human Life Design, Toyo University, Oka 48-1, Asaka-Shi, Saitama, 351-8510, Japan.
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan.
| | - Kazuhiro Shimizu
- Department of Sports Science, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo, 115-0056, Japan
- Sports Research & Development Core, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Yuko Tanimura
- Faculty of Human Studies, Aichi Toho University, 3-11 Heiwagaoka, Meitou-ku, Aichi, 465-8515, Japan
| | - Yukichi Hanaoka
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Koichi Watanabe
- Faculty of Health and Sport Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Ichiro Kono
- University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Shumpei Miyakawa
- Faculty of Health and Sport Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| |
Collapse
|
19
|
Ogawa H, Ajioka M, Ishii H, Okumura T, Murase Y, Osanai H, Nakasima Y, Asano H, Sakai K. Long-term effects of tolvaptan in patients requiring recurrent hospitalization for heart failure. Nagoya J Med Sci 2015; 77:355-62. [PMID: 26412881 PMCID: PMC4574322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 04/17/2015] [Indexed: 11/12/2022]
Abstract
Although reports suggest that tolvaptan does not reduce survival or subsequent hospitalization rates in heart failure patients, its continuous use has shown good outcomes in some patients who cannot be effectively managed with high doses of loop diuretics. Therefore, we investigated the association of patient characteristics and continued tolvaptan use in heart failure patients with changes in the frequency and annual duration of patient hospitalization due to heart failure. We carefully reviewed the medical records of patients hospitalized due to heart failure who began tolvaptan therapy and continued with outpatient treatment between December 2010 and November 2013 (tolvaptan group); patients hospitalized for heart failure between May 2008 and March 2009 served as controls. We set the reference dates as the start of tolvaptan therapy (tolvaptan group) or as the date of admission (control group). The changes in hospitalization frequency and total hospitalization time due to heart failure, before and after the reference dates, were not significantly different between the tolvaptan and control groups. In the tolvaptan group, a high estimated glomerular filtration rate was a predictor of decreased hospitalization. Continuous tolvaptan use did not decrease hospitalization duration in all heart failure patients, but good renal function was predictive of a good response.
Collapse
Affiliation(s)
- Hayato Ogawa
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
,Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masayoshi Ajioka
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| | - Hideki Ishii
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takahiro Okumura
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yosuke Murase
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| | - Hiroyuki Osanai
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| | - Yoshihito Nakasima
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| | - Hiroshi Asano
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| | - Kazuyoshi Sakai
- Department of Cardiovascular Medicine, Tosei General Hospital, Seto, Japan
| |
Collapse
|
20
|
Nakano Y, Kondo T, Osanai H, Murase Y, Nakashima Y, Asano H, Ajioka M, Sakai K, Inden Y, Murohara T. Clinical usefulness of measuring prothrombin time and soluble fibrin levels in Japanese patients with atrial fibrillation receiving rivaroxaban. J Cardiol 2014; 65:185-90. [PMID: 25192594 DOI: 10.1016/j.jjcc.2014.07.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 07/23/2014] [Accepted: 07/31/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Rivaroxaban is currently used to prevent stroke in patients with atrial fibrillation. Measuring coagulation function may help clinicians to understand the effects of this drug and the associated risk of bleeding. METHODS AND RESULTS Rivaroxaban was given to 136 patients with non-valvular atrial fibrillation. Mean age was 74.5±9.0 years (men: 63.2%) and mean CHADS2 score (±SD) was 1.8±1.2. Prothrombin times (PTs) and plasma soluble fibrin (SF) levels were examined in 84 out of 136 patients at baseline and at least 2 weeks thereafter. In 48 patients we were able to collect blood at exact times, namely just before and 3h after rivaroxaban administration, corresponding to the trough and peak concentrations. Mean peak PT in 48 patients was 17.1±3.6s and median peak SF level was 1.46μg/mL. Multiple regression analysis showed that female sex, high brain natriuretic peptide, and high dose were independent factors prolonging the peak PT. Patients with peak PTs ≥20s experienced significantly more bleeding events. Among 29 of 46 patients newly treated with rivaroxaban without any previous anticoagulant, we examined coagulation function at the exact trough and peak times. In 29 patients, peak PT was significantly more prolonged than the baseline or trough PT (p<0.001 for both), whereas trough PT was comparable to the baseline PT. In contrast, both trough and peak SF levels in these newly treated patients were significantly reduced than at baseline (p=0.003 and p<0.001, respectively). CONCLUSIONS In Japanese patients with non-valvular atrial fibrillation receiving rivaroxaban, a prolonged peak PT (≥20s) could indicate increased risk of bleeding, and both trough and peak SF levels were reduced relative to baseline. PT and SF are both valuable measures of coagulation status in patients receiving rivaroxaban, regardless of prior anticoagulant history.
Collapse
Affiliation(s)
- Yoshihisa Nakano
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takahisa Kondo
- Department of Advanced Medicine in Cardiopulmonary Disease, Nagoya University Graduate School of Medicine, Nagoya, Japan.
| | - Hiroyuki Osanai
- Department of Cardiovascular Medicine, Tosei General Hospital, Aichi, Japan
| | - Yosuke Murase
- Department of Cardiovascular Medicine, Tosei General Hospital, Aichi, Japan
| | | | - Hiroshi Asano
- Department of Cardiovascular Medicine, Tosei General Hospital, Aichi, Japan
| | - Masayoshi Ajioka
- Department of Cardiovascular Medicine, Tosei General Hospital, Aichi, Japan
| | - Kazuyoshi Sakai
- Department of Cardiovascular Medicine, Tosei General Hospital, Aichi, Japan
| | - Yasuya Inden
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| |
Collapse
|
21
|
Komori Y, Kobayashi D, Murase Y, Enomoto I, Takagi H, Kono I. The use of contact lenses during water-polo play: A 20-year study of Japanese college players. J Sports Sci 2013; 31:607-11. [DOI: 10.1080/02640414.2012.742957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
22
|
Ogawa H, Ajioka M, Otaka N, Sakaguchi T, Nakano Y, Hara A, Murase Y, Osanai H, Nakashima Y, Asano H. Long-term Effects of Tolvaptan in Patients with Heart Failure. J Card Fail 2012. [DOI: 10.1016/j.cardfail.2012.08.301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
23
|
Kuwayama T, Murase Y, Fujikawa Y, Osanai H, Nakashima Y, Asano H, Ichihara T, Ajioka M, Sakai K. Successful Management of Refractory Pericardial Effusion due to Cardiac Amyloidosis Diagnosed by Pericardiotomy and Pericardial Biopsy - A Case Report. J Card Fail 2011. [DOI: 10.1016/j.cardfail.2011.06.534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
24
|
Nakatochi M, Miyata S, Tanimura D, Izawa H, Asano H, Murase Y, Kato R, Ichihara S, Naruse K, Matsubara T, Honda H, Yokota M. The ratio of adiponectin to homeostasis model assessment of insulin resistance is a powerful index of each component of metabolic syndrome in an aged Japanese population: results from the KING Study. Diabetes Res Clin Pract 2011; 92:e61-5. [PMID: 21458098 DOI: 10.1016/j.diabres.2011.02.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 12/01/2010] [Accepted: 02/28/2011] [Indexed: 12/19/2022]
Abstract
We evaluated the ratio of adiponectin level to homeostasis model assessment of insulin resistance (A/H ratio) as a risk marker for metabolic syndrome (MetS) and each of its components. The A/H ratio may prove to be a powerful index for evaluation of risk for MetS and each of its components.
Collapse
Affiliation(s)
- Masahiro Nakatochi
- Department of Biotechnology, Nagoya University School of Engineering, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Tanimura D, Shibata R, Izawa H, Hirashiki A, Asano H, Murase Y, Miyata S, Nakatochi M, Ouchi N, Ichihara S, Yasui K, Yoshida T, Naruse K, Matsubara T, Yokota M. Relation of a common variant of the adiponectin gene to serum adiponectin concentration and metabolic traits in an aged Japanese population. Eur J Hum Genet 2010; 19:262-9. [PMID: 21150884 DOI: 10.1038/ejhg.2010.201] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Adiponectin is an adipocyte-derived protein that is down-regulated in obesity-linked disorders. Variants of the adiponectin gene (ADIPOQ) have been shown to affect adiponectin level. We have now examined the relation of polymorphisms of ADIPOQ to adiponectin concentration and to metabolic disorders in the Kita-Nagoya Genomic Epidemiology study, a population-based study of elderly Japanese. The genomic region including ADIPOQ was genotyped for 30 single nucleotide polymorphisms in 500 subjects of a screening population with the use of a fluorescence- or colorimetry-based allele-specific DNA primer-probe assay system. Four polymorphisms were then selected for genotyping in an additional 2797 subjects. Serum adiponectin level was negatively associated with metabolic abnormalities after adjustment for age and sex. The minor alleles of the rs1656930, Ile164Thr, and rs9882205 polymorphisms were associated with a low serum adiponectin level. Whereas the minor alleles of rs1656930 and rs9882205 were common (minor allele frequency of 6.2 and 38.5%, respectively), that of Ile164Thr was rare (0.9%). The minor allele of rs1656930 was positively associated with systolic blood pressure and the prevalence of hypertension. The association of rs1656930 with adiponectin level was replicated in an independent population. A subject with the 164Thr/Thr genotype had an extremely low serum adiponectin level (0.6 μg/ml) and the phenotype of metabolic syndrome. Our results suggest that a common variant of ADIPOQ, the minor allele of rs1656930, is associated with hypoadiponectinemia and hypertension. Screening for a common genetic background underlying low adiponectin levels might provide important information for assessment and management of metabolic disorders.
Collapse
Affiliation(s)
- Daisuke Tanimura
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Maeda S, Wada T, Iwamoto T, Murase Y, Mitarai S, Sugawara I, Kato S. Beijing family Mycobacterium tuberculosis isolated from throughout Japan: phylogeny and genetic features. Int J Tuberc Lung Dis 2010; 14:1201-1204. [PMID: 20819269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
To estimate the current population genetic structure of Mycobacterium tuberculosis in Japan, phylogenetic traits were analysed for 237 Beijing family strains isolated from tuberculosis patients throughout the country. Unlike previous reports from other countries, the ancient Beijing sublineage was predominant throughout Japan. Clustering analysis based on JATA-VNTR (Japan Anti-Tuberculosis Association variable numbers of tandem repeats), a specialised set of VNTR for the discrimination of Japanese M. tuberculosis strains, revealed high similarity of the modern Beijing sublineage strains, irrespective of their geographic origin. JATA-VNTR might be useful for the phylogenetic classification in populations where ancient Beijing strains are frequently isolated.
Collapse
Affiliation(s)
- S Maeda
- The Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, Kiyose, Tokyo, Japan.
| | | | | | | | | | | | | |
Collapse
|
27
|
Mori A, Konnai S, Yamada S, Hidano A, Murase Y, Ito T, Takano A, Kawabata H, Onuma M, Ohashi K. Two novel Salp15-like immunosuppressant genes from salivary glands of Ixodes persulcatus Schulze tick. Insect Mol Biol 2010; 19:359-365. [PMID: 20201978 DOI: 10.1111/j.1365-2583.2010.00994.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Salp15, a 15-kDa tick salivary gland protein, is known for several suppressive activities against host immunity and critical functions for the transmission of Lyme borrelia in Ixodes scapularis and Ixodes ricinus, the major vectors found in North America and Western Europe. Salp15 inhibits the activation of cluster of differentiation (CD)4(+)T-cells through the repression of T-cell receptor (TCR)-triggered calcium fluxes and interleukin (IL)-2 production. Furthermore, Salp15 adheres to the spirochaeta and specifically interacts with its outer surface protein C. The binding of Salp15 to Borrelia burgdorferi protects it from antibody-mediated killing in vitro. The aim of this study is to identify the Salp15 genes in Ixodes persulcatus Schulze, the specific vector for human Lyme borreliosis in Japan. Two cDNA clones encoding the Salp15-like sequence were obtained from salivary glands of fed female ticks. These genes encode 135- and 132-amino acid proteins, designated Salp15 Iper-1 and Salp15 Iper-2, respectively, both having signal peptide sequences and predicted to be secretory proteins. Salp15 Iper-1 and -2 showed 51.8 and 68.2% similarity to I. scapularis Salp15, respectively. Reverse transcriptase PCR analysis showed that Salp15 Iper genes were expressed specifically in the salivary glands throughout life cycle stages of the ticks and were up-regulated by blood feeding. In the I. persulcatus-derived sequences, the C-terminal part, which is the binding domain to the CD4 molecule of T-cells in I. scapularis Salp15, was well conserved. In the future, it will be necessary to analyse immunosuppressive functions of I. persulcatus Salp15 and their interaction with Borrelia spp. in Japan.
Collapse
Affiliation(s)
- A Mori
- Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Suzuki S, Narita Y, Yamawaki A, Murase Y, Satake M, Mutsuga M, Okamoto H, Kagami H, Ueda M, Ueda Y. Effects of extracellular matrix on differentiation of human bone marrow-derived mesenchymal stem cells into smooth muscle cell lineage: utility for cardiovascular tissue engineering. Cells Tissues Organs 2009; 191:269-80. [PMID: 19940434 DOI: 10.1159/000260061] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Bone marrow-derived mesenchymal stem cells (MSCs) can differentiate into various types of cell, and the extracellular matrix (ECM) is acknowledged to be important for the regulation of cell functions. In this study, we demonstrated the effects of ECMs on the differentiation of human bone marrow-derived MSCs into a smooth muscle cell (SMC) lineage. METHODS Human MSCs (hMSCs) were cultured on dishes coated with 3 types of ECM including laminin (LM), collagen type IV (Col-IV) and fibronectin for 7 days, and simultaneously cultured on a noncoated dish as a control. Cell numbers of these cultured hMSCs were counted, and their expression of SMC-specific genes and proteins was evaluated. hMSCs were then seeded on LM-coated biodegradable sheets and implanted into rat subcutaneous space. After 2 weeks of implantation, these tissues were evaluated. RESULTS The number of hMSCs was significantly increased by culture on Col-IV-coated dishes. The expression of SMC-specific genes and proteins (alpha-smooth muscle actin, ASMA; h1-calponin, CALP) in hMSC was significantly upregulated from culture on LM-coated dishes. LM-coated sheets showed a significantly increased expression of ASMA and CALP protein in vivo. Moreover, a fully differentiated marker (SM2) was expressed in the in vivo implanted hMSCs in the course of 2 weeks on the LM-coated sheet. CONCLUSION These results suggest that the signal transduction of the cell-matrix interaction for the differentiation of hMSCs into SMCs was activated when cultured with LM. LM-coated materials may thus be useful for cardiovascular tissue engineering.
Collapse
Affiliation(s)
- Shuichi Suzuki
- Department of Cardiac Surgery, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Unno K, Shibata R, Izawa H, Hirashiki A, Murase Y, Yamada T, Kobayashi M, Noda A, Nagata K, Ouchi N, Murohara T. Adiponectin acts as a positive indicator of left ventricular diastolic dysfunction in patients with hypertrophic cardiomyopathy. Heart 2009; 96:357-61. [DOI: 10.1136/hrt.2009.172320] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
30
|
Muro Y, Sugiura K, Nitta Y, Mitsuma T, Hoshino K, Usuda T, Hayashi K, Murase Y, Shimizu M, Matsuo H. Scoring of reflux symptoms associated with scleroderma and the usefulness of rabeprazole. Clin Exp Rheumatol 2009; 27:15-21. [PMID: 19796556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE The high frequency of gastroesophageal reflux disease (GERD) as a complication of scleroderma (systemic sclerosis, SSc) calls for treatment with powerful acid suppressants such as proton pump inhibitors (PPI). The present study used a GERD-specific questionnaire to assess the symptoms of GERD in SSc patients, and examine the effectiveness of rabeprazole (RPZ) for treating the symptoms of GERD. METHODS The Frequency Scale for the Symptoms of GERD (FSSG), a medical questionnaire developed in Japan for evaluating GERD, and the Visual Analogue Scale (VAS) were used to evaluate GERD symptoms and the degree of pain, respectively, in 151 SSc subjects. These tools were also used to assess the effect of 8 weeks' treatment with the PPI RPZ (10 mg/day). RESULTS Data on age and gender, and FSSG and VAS scores before treatment and after 4 and 8 weeks' RPZ treatment, were available for 84 subjects. The mean FSSG score was 13.9+/-9.7 before treatment, 8.3+/-8.1 after 4 weeks of treatment, and 7.0+/-7.0 after 8 weeks of treatment; the score reduction was significant (p<0.001) indicating the effectiveness of RPZ in improving subjective GERD symptoms. The VAS scores revealed a significant improvement in pain after both 4 and 8 weeks compared with baseline scores. Six subjects experienced adverse effects and five discontinued the analysis during the period. CONCLUSION Administration of RPZ 10 mg/day is effective for the control of the symptoms of GERD associated with SSc. In addition to assessing the symptoms of GERD, the FSSG questionnaire can be used to evaluate the therapeutic effect of drugs.
Collapse
Affiliation(s)
- Y Muro
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Kobayashi M, Izawa H, Cheng XW, Asano H, Hirashiki A, Unno K, Ohshima S, Yamada T, Murase Y, Kato TS, Obata K, Noda A, Nishizawa T, Isobe S, Nagata K, Matsubara T, Murohara T, Yokota M. Dobutamine stress testing as a diagnostic tool for evaluation of myocardial contractile reserve in asymptomatic or mildly symptomatic patients with dilated cardiomyopathy. JACC Cardiovasc Imaging 2009; 1:718-26. [PMID: 19356507 DOI: 10.1016/j.jcmg.2008.04.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/29/2008] [Revised: 03/27/2008] [Accepted: 04/17/2008] [Indexed: 11/17/2022]
Abstract
OBJECTIVES We performed dobutamine stress testing for evaluation of myocardial contractile reserve in asymptomatic or mildly symptomatic patients with dilated cardiomyopathy (DCM). BACKGROUND Catecholamine sensitivity is reduced in failing hearts as a result of myocardial abnormalities in the beta-adrenergic receptor signaling pathway. However, little is known about adrenergic myocardial contractile reserve in asymptomatic or mildly symptomatic patients with DCM. METHODS The maximal first derivative of left ventricular pressure (LV dP/dt(max)) was determined during infusion of dobutamine (10 microg kg(-1) min(-1)) in 46 asymptomatic or mildly symptomatic (New York Heart Association functional class I or II) patients with DCM. The expression of messenger ribonucleic acid (mRNA) for contractile regulatory proteins in endomyocardial biopsy specimens was quantified by reverse transcription and real-time polymerase chain reaction analysis. Plasma norepinephrine levels were measured in all patients and [(123)I]metaiodobenzylguanidine (MIBG) scintigraphy performed. RESULTS Patients were classified into 3 groups based on the percentage increase in LV dP/dt(max) induced by dobutamine (DeltaLV dP/dt(max)) and on LV ejection fraction (LVEF) at baseline: group I (n = 18): DeltaLV dP/dt(max) >100% and LVEF >25%; group IIa (n = 17): DeltaLV dP/dt(max) <or=100% and LVEF > 25%; and group IIb (n = 11): DeltaLV dP/dt(max) <or=100% and LVEF <or=25%. The amounts of beta(1)-adrenergic receptor, sarcoplasmic reticulum Ca(2+)-adenosine triphosphatase, and phospholamban mRNA were significantly smaller in groups IIa and IIb than in group I. The plasma norepinephrine level was increased and the delayed heart/mediastinum count ratio in MIBG scintigraphy was decreased in both groups IIa and IIb. CONCLUSIONS Dobutamine stress testing is a useful diagnostic tool for identifying reduced adrenergic myocardial contractile reserve related to altered myocardial expression of beta(1)-adrenergic receptor, sarcoplasmic reticulum Ca(2+)-adenosine triphosphatase, and phospholamban genes even in asymptomatic or mildly symptomatic patients with DCM.
Collapse
Affiliation(s)
- Masakazu Kobayashi
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Zako T, Murase Y, Iizuka R, Kanzaki T, Shimizu M, Yohda M, Maeda M. Interaction between Molecular Chaperone Prefoldin with Group II Chaperonin in the Presence of Nucleotides: Implication for Substrate Transfer Mechanism from Prefoldin to Chaperonin. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.2223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
33
|
Narita Y, Kagami H, Matsunuma H, Murase Y, Ueda M, Ueda Y. Decellularized ureter for tissue-engineered small-caliber vascular graft. J Artif Organs 2008; 11:91-9. [PMID: 18604613 DOI: 10.1007/s10047-008-0407-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2007] [Accepted: 02/23/2008] [Indexed: 11/25/2022]
Abstract
Previous attempts to create small-caliber vascular prostheses have been limited. The aim of this study was to generate tissue-engineered small-diameter vascular grafts using decellularized ureters (DUs). Canine ureters were decellularized using one of four different chemical agents [Triton-X 100 (Tx), deoxycholate (DCA), trypsin, or sodium dodecyl sulfate (SDS)] and the histology, residual DNA contents, and immunogenicity of the resulting DUs were compared. The mechanical properties of the DUs were evaluated in terms of water permeability, burst strength, tensile strength, and compliance. Cultured canine endothelial cells (ECs) and myofibroblasts were seeded onto DUs and evaluated histologically. Canine carotid arteries were replaced with the EC-seeded DUs (n = 4). As controls, nonseeded DUs (n = 5) and PTFE prostheses (n = 4) were also used to replace carotid arteries. The degree of decellularization and the maintenance of the matrix were best in the Tx-treated DUs. Tx-treated and DCA-treated DUs had lower remnant DNA contents and immunogenicity than the others. The burst strength of the DUs was more than 500 mmHg and the maximum tensile strength of the DUs was not different to that of native ureters. DU compliance was similar to that of native carotid artery. The cell seeding test resulted in monolayered ECs and multilayered alpha-smooth muscle actin-positive cells on the DUs. The animal implantation model showed that the EC-seeded DUs were patent for at least 6 months after the operation, whereas the nonseeded DUs and PTFE grafts become occluded within a week. These results suggest that tissue-engineered DUs may be a potential alternative conduit for bypass surgery.
Collapse
Affiliation(s)
- Yuji Narita
- Department of Clinical Cell Therapy and Tissue Engineering, Nagoya University School of Medicine, Nagoya, 466-8550, Japan.
| | | | | | | | | | | |
Collapse
|
34
|
Ohkado A, Nagamine M, Murase Y, Uchimura K, Kaguraoka S, Tatsumi Y, Yamada N, Ohmori M, Maeda S, Maeda H, Kato S, Mori T, Ishikawa N. Molecular epidemiology of Mycobacterium tuberculosis in an urban area in Japan, 2002-2006. Int J Tuberc Lung Dis 2008; 12:548-554. [PMID: 18419891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
SETTING Shinjuku City, Tokyo, Japan. OBJECTIVE To evaluate the status of transmission of Mycobacterium tuberculosis in Shinjuku City to allocate resources efficiently and effectively for a successful tuberculosis (TB) control programme. DESIGN Observational descriptive study combining the genotype data of M. tuberculosis with TB patient profiles. RESULTS The genotype clustering rate was significantly higher in males (adjusted odds ratio [aOR] 1.94, 95%CI 1.04-3.65, P = 0.038), patients aged <40 years (aOR 2.09, 95%CI 1.17-3.71, P = 0.012) and the homeless (aOR 2.72, 95%CI 1.42-5.20, P = 0.002), and was lower for the foreign-born (aOR 0.21, 95%CI 0.06-0.76, P = 0.017). Among 45 genotype clusters containing 152 TB patients, 26 clusters containing 102 patients (67.1%) were composed of a mix of homeless and non-homeless patients. One of the mixed clusters included an 8-month-old infant born in Japan. CONCLUSION The study revealed that M. tuberculosis transmission occurred more frequently among the homeless than in non-homeless persons. However, transmission by casual contact between the homeless and the general population was also shown to occur.
Collapse
Affiliation(s)
- A Ohkado
- Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, Kiyose, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Shimizu K, Ito A, Arinobe M, Murase Y, Iwata Y, Narita Y, Kagami H, Ueda M, Honda H. Effective cell-seeding technique using magnetite nanoparticles and magnetic force onto decellularized blood vessels for vascular tissue engineering. J Biosci Bioeng 2007; 103:472-8. [PMID: 17609164 DOI: 10.1263/jbb.103.472] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Accepted: 02/20/2007] [Indexed: 11/17/2022]
Abstract
Increasing attention has been given to vascular tissue engineering in recent years. Although cell seeding onto tubular scaffolds is the first step for constructing three-dimensional vascular grafts, the tubular geometry of the grafts hinders the efficient delivery of cells onto the scaffold. To overcome these limitations, we present here a novel cell-seeding technique using magnetic force and magnetite nanoparticles, termed Mag-seeding. NIH/3T3 fibroblasts (3T3s) were labeled magnetically using our original magnetite cationic liposomes (MCLs), which have a positive surface charge, to improve adsorption onto cell surface. In this study, porcine decellularized common carotid artery (dCCA) was used as one of the most promising scaffolds, because dCCA consists of a mixture of structural and functional proteins that constitute the extracellular matrix. When a cylindrical magnet was inserted into the lumen of dCCA and the dCCA was immersed into a suspension of magnetically labeled 3T3s, almost all the 3T3s attached onto the dCCA, whereas a low cell-seeding efficiency was achieved without using a magnet. When the magnetite uptake rate per cell increased, cell-seeding efficiency by Mag-seeding was enhanced. Furthermore, to construct a vascular graft for humans, the porcine dCCA, which was reseeded with two human cells (smooth muscle cells and dermal fibroblasts), was successfully constructed by Mag-seeding. These results indicate that Mag-seeding can be used for vascular tissue engineering.
Collapse
Affiliation(s)
- Kazunori Shimizu
- Department of Biotechnology, School of Engineering, Nagoya University, Nagoya, Aichi, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Sunagawa K, Ooshiro T, Murase Y, Hazama R, Nagamine I. Mechanisms Controlling Feed Intake in Large-type Goats Fed on Dry Forage. Asian Australas J Anim Sci 2007. [DOI: 10.5713/ajas.2007.1182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
37
|
Noda A, Izawa H, Asano H, Nakata S, Hirashiki A, Murase Y, Iino S, Nagata K, Murohara T, Koike Y, Yokota M. Beneficial effect of bilevel positive airway pressure on left ventricular function in ambulatory patients with idiopathic dilated cardiomyopathy and central sleep apnea-hypopnea: a preliminary study. Chest 2007; 131:1694-701. [PMID: 17400681 DOI: 10.1378/chest.06-2271] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Sleep-disordered breathing is common in individuals with left ventricular (LV) dysfunction and has been treated with nocturnal positive airway pressure. We investigated whether treatment of central sleep apnea-hypopnea with bilevel positive airway pressure (BPAP) in ambulatory patients with idiopathic dilated cardiomyopathy (IDCM) might improve LV function. METHODS Fifty-two consecutive patients with IDCM who underwent both cardiac catheterization and standard polysomnography were enrolled in the study; individuals with obstructive sleep apnea syndrome were excluded. Subjects with an apnea-hypopnea index (AHI) >or= 20 episodes per hour were randomized to receive medical therapy either alone (n = 11) or together with BPAP (n = 10). RESULTS LV end-diastolic pressure, pulmonary capillary wedge pressure, and plasma concentration of brain natriuretic peptide were significantly greater, and LV ejection fraction (LVEF) was significantly lower in patients with an AHI >or= 20/h (n = 21, 40.4%) than in those with an AHI < 20/h (n = 31, 59.6%). LVEF (30.5 +/- 1.6% vs 50.8 +/- 3.5%, p < 0.001) [mean +/- SE] and plasma concentration of brain natriuretic peptide (162.8 +/- 44.5 pg/mL vs 32.7 +/- 17.6 pg/mL, p = 0.02) were significantly increased and decreased, respectively, after treatment with BPAP (daily use, 4.8 +/- 0.3 h) for 3 months, whereas these parameters remained unchanged in the control subjects. CONCLUSIONS Our findings suggest that treatment of coexisting central sleep apnea-hypopnea with BPAP improves LV function in ambulatory patients with IDCM. BPAP should thus be considered as a nonpharmacologic adjunct to conventional drug therapy in such patients.
Collapse
Affiliation(s)
- Akiko Noda
- Nagoya University School of Health Sciences, 1-1-20 Daiko, Minami, Nagoya, Aichi 461-8673, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Murase Y, Imagawa A, Hanafusa T, Iwahashi H, Uchigata Y, Kanatsuka A, Kawasaki E, Kobayashi T, Shimada A, Shimizu I, Maruyama T, Makino H. Fulminant type 1 diabetes as a high risk group for diabetic microangiopathy--a nationwide 5-year-study in Japan. Diabetologia 2007; 50:531-7. [PMID: 17235525 DOI: 10.1007/s00125-006-0575-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Accepted: 11/23/2006] [Indexed: 11/29/2022]
Abstract
AIMS/HYPOTHESIS The aim of the present study was to assess the development of microangiopathy in patients with fulminant type 1 diabetes, a novel subtype of type 1B diabetes. MATERIALS AND METHODS In a nationwide survey, we followed 41 patients with fulminant type 1 diabetes and 76 age- and sex-matched patients with type 1A diabetes for 5 years. The following data were recorded every 12 months after the onset of diabetes: seven-point blood glucose concentrations, HbA1c level, urinary albumin excretion, serum C-peptide level, blood pressure, daily dosages of insulin, frequency of severe hypoglycaemic episodes, and neurological and fundoscopic examination. RESULTS The 5-year cumulative incidence of microangiopathy was 24.4% in fulminant type 1 diabetes and 2.6% in type 1A diabetes. In longitudinal studies using the Kaplan-Meier method, the cumulative incidence of each form of microangiopathy was significantly higher in fulminant type 1 diabetes than in type 1A diabetes; retinopathy was 9.8% vs 0% (p=0.014), nephropathy 12.2% vs 2.6% (p=0.015) and neuropathy 12.2% vs 1.3% (p=0.010), respectively. Mean HbA1c levels were similar in the fulminant and type 1A diabetes groups during the follow-up periods. However, the mean M-value, mean insulin dosages and the frequency of severe hypoglycaemic episodes were significantly higher, and the mean postprandial C-peptide level was significantly lower in the fulminant type 1 diabetes group. CONCLUSIONS/INTERPRETATION These data suggest that patients with fulminant type 1 diabetes are a high-risk subgroup for diabetic microangiopathy associated with the lack of endogenous insulin secretion from the onset of diabetes.
Collapse
Affiliation(s)
- Y Murase
- First Department of Internal Medicine, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki, and Department of Metabolism/Diabetes and Clinical Nutrition, Nagasaki University Hospital of Medicine and Dentistry, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Kon M, Kimura F, Akimoto T, Tanabe K, Murase Y, Ikemune S, Kono I. Effect of Coenzyme Q10 supplementation on exercise-induced muscular injury of rats. Exerc Immunol Rev 2007; 13:76-88. [PMID: 18198662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
AIM We aimed to examine the effect of Coenzyme Q10 (CoQ10) supplementation on the exhaustive exercise-induced injury and oxidative stress in skeletal muscle and liver. METHODS Rats were divided into four groups: rest group [control (Con)-Rest; n = 6)], exercise group (Con-Ex; n = 6), rest group with CoQ10 supplement (CoQ10-Rest; n = 6), and exercise group with CoQ10 supplement (CoQ10-Ex; n = 6). The exercise groups were run on a treadmill until exhaustion. The CoQ10 supplemented groups received an oral administration of CoQ10 (300 mg kg(-1), 4 weeks). After 4 weeks, total CoQ concentration, creatine kinase (CK), glutamic-oxaloacetic transaminase (GOT), malondialdehyde (MDA), scavenging activity against reactive oxygen species [ROS; superoxide anions (O2*-) and hydroxyl radicals (HO*)] were measured. RESULTS Total CoQ concentration in plasma, slow-twitch muscles (soleus and gastronemius deep portion), and liver were significantly increased by CoQ10 supplementation. Plasma CK was significantly higher in Con-Ex compared with Con-Rest, whereas there was no difference between CoQ10-Rest and CoQ10-Ex. There were no significant differences in muscle MDA in each group. Plasma GOT and liver MDA in exercise groups were significantly higher than that of rest groups, but not significantly different between CoQ10 supplemented groups and control groups. CoQ10 supplementation was not able to favorably influence ROS scavenging activity in skeletal muscle and liver. CONCLUSIONS These data indicated that CoQ10 supplementation increased total CoQ concentration in the slow-twitch muscles, and was useful for reducing exhaustive exercise-induced muscular injury by enhancing stabilization of muscle cell membrane.
Collapse
Affiliation(s)
- Michihiro Kon
- Graduate School of Comprehensive Human Sciences, Doctoral program of Sports Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8574, Japan
| | | | | | | | | | | | | |
Collapse
|
40
|
Zako T, Murase Y, Iizuka R, Yoshida T, Kanzaki T, Ide N, Maeda M, Funatsu T, Yohda M. Localization of Prefoldin Interaction Sites in the Hyperthermophilic Group II Chaperonin and Correlations between Binding Rate and Protein Transfer Rate. J Mol Biol 2006; 364:110-20. [PMID: 17010374 DOI: 10.1016/j.jmb.2006.08.088] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2006] [Revised: 08/20/2006] [Accepted: 08/29/2006] [Indexed: 11/17/2022]
Abstract
Prefoldin is a molecular chaperone that captures a protein-folding intermediate and transfers it to a group II chaperonin for correct folding. The manner by which prefoldin interacts with a group II chaperonin is poorly understood. Here, we have examined the prefoldin interaction site in the archaeal group II chaperonin, comparing the interaction of two Thermococcus chaperonins and their mutants with Pyrococcus prefoldin by surface plasmon resonance. We show that the mutations of Lys250 and Lys256 of Thermococcus alpha chaperonin residues to Glu residues increase the affinity to Pyrococcus prefoldin to the level of Thermococcus beta chaperonin and Pyrococcus chaperonin, indicating that their Glu250 and Glu256 residues of the helical protrusion region are responsible for relatively stronger binding to Pyrococcus prefoldin than Thermococcus alpha chaperonin. Since the putative chaperonin binding sites in the distal ends of Pyrococcus prefoldin are rich in basic residues, electrostatic interaction seems to be important for their interaction. The substrate protein transfer rate from prefoldin correlates well with its affinity for chaperonin.
Collapse
Affiliation(s)
- Tamotsu Zako
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei-Shi, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Murase Y, Narita Y, Kagami H, Miyamoto K, Ueda Y, Ueda M, Murohara T. Evaluation of Compliance and Stiffness of Decellularized Tissues as Scaffolds for Tissue-Engineered Small Caliber Vascular Grafts Using Intravascular Ultrasound. ASAIO J 2006; 52:450-5. [PMID: 16883127 DOI: 10.1097/01.mat.0000227727.87476.5e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
This study evaluated the compliance and stiffness of decellularized canine common carotid artery as well as decellularized canine ureter and compared it with that of polytetrafluoroethylene, elastin gel combined with polylactic acid tube, and canine common carotid artery. To calculate the compliance and stiffness, internal diameters and cross-sectional areas were measured according to changes in the intraluminal pressures using intravascular ultrasound in a closed circuit system equipped with a syringe pump. The pressure-area curve, stiffness parameter beta, and diameter compliance were evaluated. Canine common carotid artery and decellularized canine common carotid artery, as well as decellularized canine ureter, showed a compliant response, a J-shaped curve. However, the latter evidenced different characteristics in the low pressure range. Although the cross-sectional area of the elastin gel combined with polylactic acid tube showed some changes, it did not present a J-shape curve. Polytetrafluoroethylene exhibited a noncompliant response.The results in this study have shown that the compliance in the decellularized matrices was maintained after cell extraction, which demonstrated the importance of the remaining matrix structure in the mechanical properties of decellularized tissue. A clear difference between the decellularized matrices and synthetic materials was noted in terms of the compliance, even in materials composed of relatively elastic materials.
Collapse
Affiliation(s)
- Yosuke Murase
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | | | | | | | | | | | | |
Collapse
|
42
|
Izawa H, Murohara T, Nagata K, Isobe S, Asano H, Amano T, Ichihara S, Kato T, Ohshima S, Murase Y, Iino S, Obata K, Noda A, Okumura K, Yokota M. Mineralocorticoid receptor antagonism ameliorates left ventricular diastolic dysfunction and myocardial fibrosis in mildly symptomatic patients with idiopathic dilated cardiomyopathy: a pilot study. Circulation 2006; 112:2940-5. [PMID: 16275882 DOI: 10.1161/circulationaha.105.571653] [Citation(s) in RCA: 192] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Mineralocorticoid receptor antagonism reduces mortality associated with heart failure by mechanisms that remain unclear. The effects of the mineralocorticoid receptor antagonist spironolactone on left ventricular (LV) function and chamber stiffness associated with myocardial fibrosis were investigated in mildly symptomatic patients with idiopathic dilated cardiomyopathy (DCM). METHODS AND RESULTS Twenty-five DCM patients with a New York Heart Association functional class of I or II were examined before and after treatment with spironolactone for 12 months. LV pressures and volumes were measured simultaneously, and LV endomyocardial biopsy specimens were obtained. Serum concentrations of the carboxyl-terminal propeptide (PIP) and carboxyl-terminal telopeptide (CITP) of collagen type I were measured. The patients were divided into 2 groups on the basis of the serum PIP/CITP ratio (< or =35, group A, n=12; >35, group B, n=13), an index of myocardial collagen accumulation. LV diastolic chamber stiffness, the collagen volume fraction, and abundance of collagen type I and III mRNAs in biopsy tissue were greater and the LV early diastolic strain rate (tissue Doppler echocardiography) was smaller in group B than in group A at baseline. These differences and the difference in PIP/CITP were greatly reduced after treatment of patients in group B with spironolactone, with treatment having no effect on these parameters in group A. The collagen volume fraction was significantly correlated with PIP/CITP, LV early diastolic strain rate, and LV diastolic chamber stiffness for all patients before and after treatment with spironolactone. CONCLUSIONS Spironolactone ameliorated LV diastolic dysfunction and reduced chamber stiffness in association with regression of myocardial fibrosis in mildly symptomatic patients with DCM. These effects appeared limited, however, to patients with increased myocardial collagen accumulation.
Collapse
Affiliation(s)
- Hideo Izawa
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Murase Y, Nagakawa J, Yamamoto N. In-beam fatigue behavior of 20% cold-worked 316 stainless steel at 300 °C. Fusion Engineering and Design 2006. [DOI: 10.1016/j.fusengdes.2005.06.369] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
44
|
Murase Y, Kobayashi J, Asano A, Yamaaki N, Yonezawa K, Muramoto H, Mabuchi H. Effects of raloxifene on adipocytokines in Japanese osteoporotic postmenopausal women with and without type 2 diabetes. Horm Metab Res 2006; 38:130-3. [PMID: 16523415 DOI: 10.1055/s-2006-925140] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Y Murase
- Department of Molecular Genetics of Cardiovascular Disorders, Graduate School of Medical Science, Kanazawa University, Ishikawa, Japan.
| | | | | | | | | | | | | |
Collapse
|
45
|
Kato T, Noda A, Izawa H, Yamada A, Asano H, Obata K, Murase Y, Oshima S, Murohara T, Yokota M. Discrimination of Nonobstructive Hypertrophic Cardiomyopathy from Hypertensive Left Ventricular Hypertrophy Based on Strain Rate Imaging by Tissue Doppler Ultrasonography. J Card Fail 2005. [DOI: 10.1016/j.cardfail.2005.08.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
46
|
Kobayashi J, Kusunoki M, Murase Y, Kawashiri M, Higashikata T, Miwa K, Katsuda S, Takata M, Asano A, Nohara A, Inazu A, Mabuchi H. Relationship of lipoprotein lipase and hepatic triacylglycerol lipase activity to serum adiponectin levels in Japanese hyperlipidemic men. Horm Metab Res 2005; 37:505-9. [PMID: 16138264 DOI: 10.1055/s-2005-870318] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVE The aim of this study was to determine how lipoprotein lipase (LPL) and hepatic triacylglycerol lipase (HTGL) activity relate to serum adiponectin levels. RESEARCH DESIGN AND METHODS Fifty-five hyperlipidemic Japanese men were recruited for this study. LPL and HTGL activity in post-heparin plasma (PHP) was measured using Triton X-100 emulsified-[14C] triolein. The remaining activity in the presence of 1M NaCl was defined as HTGL activity. Serum adiponectin levels were determined by an enzyme-linked immunosorbent assay system. RESULT LPL activity had a positive relationship with HDL2, but had no relation with HDL3, while HTGL had positive relationship with HDL3, but had no relationship with HDL2. LPL activity showed a positive relationship [r = 0.345, p = 0.010] to serum adiponectin levels, while and HTGL activity showed an inverse relationship [r = - 0.365 p = 0.006]. Multiple regression analysis with LPL and HTGL as dependent variables and age, BMI, serum adiponectin and the homeostasis model assessment of insulin resistance (HOMA-IR) as independent variables showed LPL and HTGL's association to adiponectin did not persist after adjustments for these covariants. However, the association of LPL activity to HOMA-IR was found to persist after adjustments of age, BMI, and serum adiponectin. CONCLUSIONS There was a co-linearity between insulin sensitivity and adiponectin as well as insulin sensitivity and LPL/HTGL activity.
Collapse
Affiliation(s)
- J Kobayashi
- Department of Lifestyle-related disease, Kanazawa University Graduate School of Medical Science, Takara-machi 13-1, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
|
48
|
Naganawa T, Ishihara Y, Iwata T, Koide M, Ohguchi M, Ohguchi Y, Murase Y, Kamei H, Sato N, Mizuno M, Noguchi T. In Vitro Biocompatibility of a New Titanium-29Niobium-13Tantalum-4.6Zirconium Alloy With Osteoblast-Like MG63 Cells. J Periodontol 2004; 75:1701-7. [PMID: 15732874 DOI: 10.1902/jop.2004.75.12.1701] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Titanium-29niobium-13tantalum-4.6zirconium (TiNb) has recently been developed as a new implant material. TiNb is composed of non-toxic elements and has a lower modulus of elasticity than the other titanium alloys. However, its biocompatibility has not been adequately characterized. The aim of this study was to evaluate the biocompatibility of TiNb using an osteoblast-titanium co-culture system. METHODS MG63 cells were cultured on three kinds of titanium disks: TiNb, pure titanium (pTi), and titanium-6aluminum-4vanadium (TiAl), prepared with two different surfaces, a polished and acid-etched surface and a machined-grooved surface. The surface topography and roughness were evaluated by scanning electron microscopy (SEM). After 48 hours culture, the number of proliferating cells and prostaglandin E2 (PGE2) production in the culture supernatant were determined. RESULTS There was no significant difference in surface roughness among the three titanium disks with a polished and acid-etched surface. After 48 hours of culture, the number of cells was significantly reduced on pTi and TiAl compared to TiNb and the control. PGE2 production was significantly higher on pTi than on TiAl, TiNb, and the control. We further examined the effect of surface roughness on PGE2 production using machine-grooved titanium disks. While pTi and TiAl stimulated the production of PGE2 depending on surface roughness, roughened TiNb did not affect PGE2 production. CONCLUSIONS These results suggest that TiNb may exhibit favorable biocompatibility because it has an efficient surface topography for cell proliferation, and the level of PGE2 production does not depend on surface roughness. We conclude that TiNb may be useful as an implant material.
Collapse
Affiliation(s)
- T Naganawa
- Department of Periodontology, School of Dentistry, Aichi-Gakuin University, Nagoya-shi Aichi, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Murase Y, Araki Y, Mizuno S, Kawaguchi C, Naito M, Yoshizawa M, Araki Y. Pregnancy following chemical activation of oocytes in a couple with repeated failure of fertilization using ICSI: Case report. Hum Reprod 2004. [DOI: 10.1093/humrep/deh570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
50
|
Hideo I, Murase Y, Asano H, Kato T, Yamada A, Ohshima S, Noda A, Nagata K, Yokota M, Murohara T. Effect of spironolactone on chamber stiffness and diastolic function associated with regression of myocardial fibrosis in dilated cardiomyopathy. J Card Fail 2004. [DOI: 10.1016/j.cardfail.2004.08.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|