1
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Iguchi M, Masunaga N, Ishii M, Fujino A, Ide Y, Hamatani Y, Yoshizawa T, Doi K, Ikeda S, Esato M, Wada H, Hasegawa K, Ogawa H, Abe M, Akao M. Association of beta blocker use with new-onset heart failure and mortality in atrial fibrillation without pre-existing heart failure: the Fushimi AF registry. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.1041] [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: 11/13/2022] Open
Abstract
Abstract
Background
Heart failure (HF) is one of the major complications in atrial fibrillation (AF). We previously reported that not a few AF patients without pre-existing HF (defined as prior HF hospitalization, New York Heart Association functional class≥2, or left ventricular ejection fraction (LVEF)<40%) subsequently developed new-onset HF. Beta blockers are the established therapy for HF, but it remains unclear whether beta blockers prevent new-onset HF and improve outcomes in AF patients without preexisting HF.
Methods
In the Fushimi AF registry, 778 of 3,262 patients without pre-existing HF were receiving beta blockers at baseline. We investigated the incidence of new-onset HF defined as cardiac death or HF hospitalization, and all-cause death in a propensity-matched cohort (N=1,198; mean age, 71 years; 39% female; mean LVEF, 66%). Additionally, annual follow-up prescription data before the onset of events were collected in 294 of patients with beta blockers and 395 of those without beta blockers. We also investigated the association of starting or stopping beta blockers with the incidence of new-onset HF and all-cause death.
Results
During the median follow-up of 5.8 years, new-onset HF and all-cause death occurred in 77 (12.9%) and 118 (19.7%) of patients with beta blockers, and 70 (11.7%) and 131 (21.9%) of those without beta blockers, respectively. Incidence of new-onset HF was comparable between patients with and without beta blockers (Figure 1), and incidence of all-cause death was also comparable between the two groups (Figure 2). In exploratory subgroup analyses, there was no interaction in the association of beta blockers with the incidence of events, except for pulse rate for new-onset HF and left atrial size for all-cause death. Hazard ratio of beta blockers for new-onset HF tended to be lower in patients with higher pulse rates (>84 bpm) (Figure 1), and that for all-cause death was lower in those without left atrial enlargement (Figure 2). Of patients with follow-up prescription data, beta blockers were stopped in 55 (18.7%) and started in 97 (24.6%) patients, respectively. Patients with starting beta blockers had higher pulse rate (78.5±17.3 vs 74.9±13.9 bpm; p=0.03) and more symptomatic AF (58.8% vs 46.0%; p=0.03) compared to those without starting beta blockers, while there was no difference in baseline characteristics between those with and without stopping beta blockers. During the follow-up, the incidences of new-onset HF and all-cause death were also comparable between the patients with and without stopping beta blockers and those with and without starting beta blockers.
Conclusion
Beta blockers were not associated with the incidence of new-onset HF and all-cause death in AF patients without pre-existing HF. However, the exploratory subgroup analyses suggested the existence of subjects who may benefit from beta blockers.
Funding Acknowledgement
Type of funding sources: Private company. Main funding source(s): Boehringer Ingelheim, Bayer Healthcare, Pfizer, Bristol-Myers Squibb, Astellas Pharma, AstraZeneca, Daiichi Sankyo, Novartis Pharma, MSD, Sanofi-Aventis, and Takeda Pharmaceutical.
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Affiliation(s)
- M Iguchi
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - N Masunaga
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Ishii
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - A Fujino
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - Y Ide
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - Y Hamatani
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - T Yoshizawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - K Doi
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - S Ikeda
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Esato
- Ogaki Tokushukai Hospital , Gifu , Japan
| | - H Wada
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - K Hasegawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - H Ogawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Abe
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Akao
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
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2
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Masunaga N, Ogawa H, Ikeda S, Doi K, Yoshizawa T, Hamatani Y, Ide Y, Fujino A, Ishii M, Iguchi M, Esato M, Wada H, Hasegawa K, Abe M, Akao M. Clinical characteristics and outcomes of atrial fibrillation patients with peripheral artery disease: the Fushimi AF Registry. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.532] [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: 11/14/2022] Open
Abstract
Abstract
Background
Atrial fibrillation (AF) represents the common arrhythmia and increases the risk of thromboembolism. Risk assessment for thromboembolism is important for the management of AF patients. Peripheral artery disease (PAD) is identified as a risk factor for thromboembolism in CHA2DS2-VASc score. However, there are little data on clinical characteristics and cardiovascular events of AF patients with PAD.
Purpose
In this study, we investigated the clinical characteristics and outcomes of AF patients with PAD.
Methods
The Fushimi AF Registry, a community-based prospective survey, was designed to enroll all of the AF patients who visited the participating medical institutions in Fushimi-ku, Kyoto, Japan. The inclusion criterion of the registry is the documentation of AF at 12-lead electrocardiogram or Holter monitoring at any time, and there are no exclusion criteria. We started to enroll patients from March 2011 and follow up data including prescription status were available in 4,464 patients from March 2011 to August 2021. Median follow-up period was 1,848 days.
Results
Of 4,464 patients, 183 patients had PAD (4.1%; PAD group). The mean age was higher in PAD group than no-PAD group (PAD group vs. no-PAD group: 76.7 vs. 73.5; p<0.01). Patients with PAD had more co-morbidities such as stroke, systemic embolism, congestive heart failure, hypertension, diabetes mellitus, dyslipidemia coronary artery disease and chronic kidney disease than those without PAD. Thus, CHADS2 score, CHA2DS2-VASc score and HAS-BLED score were higher in PAD group than no-PAD group (2.81 vs. 2.00; p<0.01, 5.17 vs. 3.30; p<0.01, 2.42 vs. 1.71; p<0.01, respectively). The proportion of patients with oral anticoagulant was similar between the two groups and the proportion of patients with antiplatelet drug was higher in PAD group than no-PAD group (59.0% vs. 55.6%; p=0.36, 62.9% vs. 24.7%; p<0.01, respectively). The incidences of all-cause death, cardiac death and myocardial infarction were higher in PAD group than no-PAD group (11.4 vs. 4.6 per 100 person-years; log-rank p<0.01, 1.7 vs. 0.8 per 100 person-years; log-rank p<0.01, 1.2 vs. 0.2 per 100 person-years; log-rank p<0.01). However, the incidence of stroke or systemic embolism was similar between the two groups (2.9 vs. 2.2 per 100 person-years, log-rank p=0.19). Finally, the incidence of composite of cardiac death, stroke, systemic embolism or myocardial infarction was higher in PAD group than no-PAD group (6.0 vs. 3.0 per 100 person-years; log-rank p<0.01).
Conclusion
AF patients with PAD had significantly higher risk for death and cardiac events, whereas the incidence of thromboembolism was similar between AF patients with and without PAD.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Japan Agency for Medical Research and Development
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Affiliation(s)
- N Masunaga
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - H Ogawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - S Ikeda
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - K Doi
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - T Yoshizawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - Y Hamatani
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - Y Ide
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - A Fujino
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Ishii
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Iguchi
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Esato
- Ogaki Tokushukai Hospital , Ogaki , Japan
| | - H Wada
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - K Hasegawa
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Abe
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
| | - M Akao
- Kyoto Medical Center, National Hospital Organization , Kyoto , Japan
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3
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Ikeda S, Iguchi M, Ogawa H, Minami K, Ishigami K, Doi K, Hamatani Y, Yoshizawa T, Ide Y, Fujino A, Ishii M, Masunaga N, Wada H, Abe M, Akao M. Association of cardiothoracic ratio with heart failure hospitalization in patients with atrial fibrillation: the Fushimi AF Registry. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.934] [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: 11/13/2022] Open
Abstract
Abstract
Background
Chest radiography is the most common diagnostic imaging test in clinical medicine, and the cardiothoracic ratio (CTR) is a readily available and non-invasive tool with which to assess the volume status and cardiomegaly. However, it remains unknown whether CTR on chest radiography is associated with the incidence of HF hospitalization in AF patients remains unclear.
Methods
The Fushimi AF Registry is a community-based prospective survey of AF patients in Fushimi-ku, Kyoto, Japan. The inclusion criterion of the registry is the documentation of AF at 12-lead electrocardiogram or Holter monitoring at any time, and there are no exclusion criteria. We started to enroll patients from March 2011, and follow-up data were available for 4,489 patients by the end of August 2021. In the present study, 3,727 patients with available data of CTR were examined. We divided the patients into two groups according to their CTR at baseline; Higher group (CTR ≥50.0%, n=2,696) and Lower group (CTR <50.0%, n=1,031), and compared the clinical background and outcomes between the two groups.
Results
The proportion of female was grater in Higher group, and the patients in Higher group were older. The patients in Higher group had higher prevalence of HF, hypertension and chronic kidney disease. During the median follow-up of 3,033 days, in Kaplan-Meier analysis, the incidence rates of HF hospitalization were higher in Higher group (Higher group: 2.5% per person-year vs. Lower group: 1.1%; p<0.01). Multivariate Cox proportional hazards regression analysis revealed that higher CTR (≥50.0%) was an independent determinant of the incidence of HF hospitalization. Furthermore, when we divided the patients into four groups based on the quartile of CTR; Q1 (CTR<49.0%), Q2 (49.0≤CTR<53.8%), Q3 (53.8≤CTR<59.0%), Q4 (59.0%≤CTR), the incidence of HF hospitalization was more frequent in patients with higher CTR, regardless of the presence or absence of prior hospitalization for HF (Figure).
Conclusion
In Japanese AF patients, patients with higher CTR had significantly higher incidence of HF hospitalization, regardless of the prevalence of prior hospitalization for HF.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- S Ikeda
- Kyoto Medical Centre , Kyoto , Japan
| | - M Iguchi
- Kyoto Medical Centre , Kyoto , Japan
| | - H Ogawa
- Kyoto Medical Centre , Kyoto , Japan
| | - K Minami
- Kyoto Medical Centre , Kyoto , Japan
| | | | - K Doi
- Kyoto Medical Centre , Kyoto , Japan
| | | | | | - Y Ide
- Kyoto Medical Centre , Kyoto , Japan
| | - A Fujino
- Kyoto Medical Centre , Kyoto , Japan
| | - M Ishii
- Kyoto Medical Centre , Kyoto , Japan
| | | | - H Wada
- Kyoto Medical Center, Division of Translational Research , Kyoto , Japan
| | - M Abe
- Kyoto Medical Centre , Kyoto , Japan
| | - M Akao
- Kyoto Medical Centre , Kyoto , Japan
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4
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Hamatani Y, Iguchi M, Minami K, Ishigami K, Ikeda S, Doi K, Yoshizawa T, Masunaga N, Esato M, Tsuji H, Wada H, Hasegawa K, Ogawa H, Abe M, Akao M. The association of left ventricular ejection fraction with incident heart failure in patients with atrial fibrillation. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.553] [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: 11/13/2022] Open
Abstract
Abstract
Background
Atrial fibrillation (AF) increases the risk of incident heart failure (HF). Left ventricular ejection fraction (LVEF) is an important prognostic parameter in patients with HF. However, little is known regarding the association of LVEF with incident HF in patients with AF.
Purpose
The aim of this study is to investigate the relationship between LVEF at enrollment and incidence of HF hospitalization during follow-up period in patients with AF.
Methods
The Fushimi AF Registry is a community-based prospective survey of patients with AF in Fushimi-ku, Kyoto, Japan. The inclusion criterion of the registry is the documentation of AF at 12-lead electrocardiogram or Holter monitoring at any time, and there are no exclusion criteria. We started to enroll patients from March 2011, and follow-up data were available for 4,489 patients by the end of August 2021. In the present study, we investigated 3,544 patients with the data of LVEF at enrollment. We divided the patients into 4 groups stratified by LVEF (reduced LVEF [LVEF <40%], mildly reduced LVEF [LVEF: 40–49%], slightly reduced LVEF [LVEF: 50–59%], and normal LVEF [LVEF ≥60%]), and compared the backgrounds and outcomes between these 4 groups.
Results
Of 3,544 patients, the mean age was 73.6±10.7 years, 1,420 (40%) were female, 1,781 (50%) were paroxysmal AF, and 1,085 (30%) had pre-existing HF. The mean CHADS2 and CHA2DS2-VASc scores were 2.1±1.3 and 3.4±1.7, respectively. The mean LVEF at enrollment was 63±12% (reduced LVEF: 197 [6%], mildly reduced LVEF: 250 [7%], slightly reduced LVEF: 532 [15%] and normal LVEF: 2,565 [72%], respectively). Patients with lower LVEF demonstrated lower prevalence of female and paroxysmal AF, and had a higher CHADS2 and CHA2DS2-VASc scores (all P<0.01). A total of 605 patients were hospitalized for HF during the median follow-up period of 5.5 years, corresponding to an annual incidence of 3.4% per person-year. Kaplan-Meier curves demonstrated that LVEF at enrollment could stratify the incidence of HF hospitalization during follow-up in patients with AF (Picture 1). Multivariable Cox regression analysis revealed that lower LVEF strata were significantly associated with the increased risk of HF hospitalization even after adjustment by age, sex, type of AF and CHA2DS2-VASc score (Picture 1). An increased risk of HF hospitalization was observed even in patients with mildly reduced LVEF (adjusted hazard ratio: 2.56, 95% CI: 1.99–3.29) as well as in those with slightly reduced LVEF (adjusted hazard ratio: 1.79, 95% CI: 1.45–2.22) compared with those with normal LVEF. These results were also the case in AF patients without pre-existing HF (Picture 2).
Conclusion
LVEF at enrollment could stratify the incidence of HF hospitalization in patients with AF, suggesting the importance of measuring LVEF in all patients with AF. Even mildly (LVEF: 40–49%) or slightly (LVEF: 50–59%) reduced LVEF was independently associated with the risk of incident HF in patients with AF.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- Y Hamatani
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - M Iguchi
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - K Minami
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - K Ishigami
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - S Ikeda
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - K Doi
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - T Yoshizawa
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - N Masunaga
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - M Esato
- Ogaki Tokushukai Hospital, Arrhythmia , Ogaki , Japan
| | - H Tsuji
- Tsuji Clinic , Kyoto , Japan
| | - H Wada
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - K Hasegawa
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - H Ogawa
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - M Abe
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
| | - M Akao
- National Hospital Organization Kyoto Medical Center , Kyoto , Japan
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5
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Nishiwaki S, Watanabe S, Yoneda F, Tanaka M, Komasa A, Yoshizawa T, Kojitani H, Shizuta S, Morimoto T, Kimura T. Impact of catheter ablation on functional tricuspid regurgitation in patients with atrial fibrillation. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1701] [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: 11/13/2022] Open
Abstract
Abstract
Background
Since atrial functional tricuspid regurgitation (AF-TR) is associated with increased heart failure and mortality, the management of AF-TR is clinically important. Atrial fibrillation (AF) plays the main role in AF-TR. However, the effectiveness of catheter ablation (CA) and mechanism of improvement of AF-TR haven't been fully evaluated.
Purpose
We sought to investigate the impact of CA for AF on AF-TR in patients with moderate or more TR.
Methods
We retrospectively investigated consecutive 2685 patients with AF who received CA from February 2004 to December 2019 in Japan. The current study population consisted of 102 patients with moderate or greater TR who underwent CA for AF. The echocardiographic parameters were compared between pre-ablation and post-ablation transthoracic echocardiography (TTE), and the recurrence rate of AF/ atrial tachycardia (AT) was measured.
Results
The mean age was 73.2 years, 53% were women. TR severity and TR jet area significantly improved after CA for AF (TR jet area: 5.8 [3.9–7.6] cm2 to 2.0 [1.1–3.0] cm2, p<0.001). In addition, mitral regurgitation (MR) jet area, left atrial (LA) area, mitral valve diameter, right ventricular (RV) end-diastolic area, right atrial (RA) area, tricuspid valve (TV) diameter decreased after CA (p<0.001, <0.001, <0.001, = 0.02, <0.001, and <0.001, respectively). There was no significant difference between one-year recurrence of AF/AT and TR severity at pre-ablation TTE (moderate 28.6%, moderate to severe 37.2%, and severe 31.6%, p=0.72).
Conclusions
TR severity and jet area improved after CA in patients with AF and moderate or more TR. RV size, RA size, TV diameter also decreased after CA, which may be associated with TR improvement. There was no significant difference between one-year recurrence of AF/AT and TR severity at pre-ablation TTE.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- S Nishiwaki
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Watanabe
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - F Yoneda
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - M Tanaka
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - A Komasa
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - T Yoshizawa
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Kojitani
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Shizuta
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - T Morimoto
- Hyogo College of Medicine, Department of Clinical Epidemiology, Hyogo, Japan
| | - T Kimura
- Kyoto University, Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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Alderete Martinez J, Shizuta S, Yoneda F, Nishiwaki S, Tanaka M, Komasa A, Kohjitani H, Yoshizawa T, Kimura T. 10-year clinical outcomes after radiofrequency catheter ablation for atrial fibrillation. A single center experience. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0518] [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: 11/13/2022] Open
Abstract
Abstract
Background
Radiofrequency catheter ablation (RFCA) for atrial fibrillation (AF) is becoming a routine procedure to treat patients with drug-refractory symptomatic AF. However, data regarding very long-term clinical outcomes is limited. The aim of the present study was to evaluate the 10-year clinical outcomes of patients who underwent RFCA for paroxysmal and persistent AF.
Methods
We retrospectively enrolled 503 consecutive patients (mean age 66,9±9,51 years; 71,6% male) who underwent RFCA for drug-refractory symptomatic AF between February 2004 and June 2011. Follow-up information was obtained using medical records and/or telephonic interviews with the patient, relatives and/or referring physicians.
Results
Among 503 patients enrolled in this study, 362 had paroxysmal atrial fibrillation (PAF) and 141 had persistent atrial fibrillation (PeAF) (72% and 28%, respectively). Mean follow-up was 8,84±3,05 years. The 10-year event-free rate for recurrent atrial tachyarrhythmia (AT) after the first procedure was 44,5% (49,4% for PAF vs 31,9% for PeAF; p=0,002 by log-rank test) and 81,9% after the last procedure (87,3% for PAF and 67,9% for PeAF; p≤0,001 by log-rank test). AT recurrence was observed most commonly during the first 12 months of the initial procedure (56%), with only 18% of them occurring after 60 months. Multivariate analysis revealed that persistent AF (hazard ratio=1,366; 95% confidence interval 1,058–1,76; p=0,017) and duration of AF >5 years (hazard ratio=1,357; 95% confidence interval 1,064–1,732; p=0,005) were independent risk factors for AT recurrence. Regarding adverse events, there were 24 (4,8%) hospitalizations for acute decompensated heart failure, 20 (4%) ischemic strokes and 14 (2,8%) bleeding complications requiring hospital admissions. Patients taking oral anticoagulation and antiarrhythmic drugs at the end of the study accounted for 32,8% and 16,7% respectively.
Conclusions
RFCA for AF provided favorable results in terms of arrhythmia event-free survival in long-term follow-up with better results in patients with paroxysmal AF. Persistent AF and long-standing AF (beyond 5 years) were associated with AT recurrence. Despite the large number of patients who discontinued oral anticoagulation, thromboembolic adverse events were rare.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
| | - S Shizuta
- Kyoto University Hospital, Kyoto, Japan
| | - F Yoneda
- Kyoto University Hospital, Kyoto, Japan
| | | | - M Tanaka
- Kyoto University Hospital, Kyoto, Japan
| | - A Komasa
- Kyoto University Hospital, Kyoto, Japan
| | | | | | - T Kimura
- Kyoto University Hospital, Kyoto, Japan
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7
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Fujii H, Kitazume Y, Uozumi R, Iihara H, Takahashi M, Arai T, Yoshizawa T, Murachi Y, Sato Y, Mikami T, Hashiguchi K, Takahashi K, Fujita Y, Yamazaki T, Hosokawa Y, Morozumi I, Tsuchiya M, Yokoyama A, Hashimoto H, Yamaguchi M. 498P Association between capecitabine efficacy and proton pump inhibitors in patients with stage II-III colorectal cancer: A retrospective multicenter study. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1017] [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: 10/20/2022] Open
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8
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Tanaka M, Shizuta S, Komasa A, Yoshizawa T, Kohjitani H, Kimura T. Sex differences and arrhythmia recurrence after catheter ablation for atrial fibrillation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0601] [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: 11/14/2022] Open
Abstract
Abstract
Background
Several previous studies reported female sex is associated with high recurrence rate of atrial tachyarrhythmia (ATA) after catheter ablation (CA) for atrial fibrillation (AF).
Purpose
We investigated the relationship between sex differences and recurrence rate of ATA after CA for AF in a large single-center database.
Methods
We enrolled consecutive 2033 patients undergoing first time CA for AF in our institution between Feb.2004 and Dec. 2017.
We compared the long-term outcomes between female (N=603) and male (N=1430).
Results
Female patients were older (70.8 vs. 66.3, p<0.0001), and had lower prevalence of persistent AF (23.1% vs. 33.5%, p<0.0001). Also, left atrial dimension was smaller (40.0 vs. 41.1, p=0.0005). and prior antiarrhythmic drug use was more prevalent (38.2% vs. 28.7%, p<0.0001) in female patients.
Ablation method for pulmonary vein isolation (PVI) was radiofrequency catheter ablation in 1634 patients (80.4%) and cryoballoon ablation in 399 (20.6%).
Median follow-up duration was 1342±115 days. The 3-year ATA recurrence rate after first CA was 35.8% overall: 39.9% in female and 34.2% in male (Log-rank P=0.01).
A multivariate analysis revealed that the factors associated with higher ATA recurrence rate were female (p=0.01), persistent AF (p=0.006), and larger left atrial dimension (p=0.007).
Conclusions
Female gender is an independent predictor of arrhythmia recurrence after CA for AF.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Tanaka
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - S Shizuta
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - A Komasa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Yoshizawa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - H Kohjitani
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Kimura
- Kyoto University Graduate School of Medicine, Kyoto, Japan
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9
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Pak M, Kobori A, Shizuta S, Sasaki Y, Toyota T, Yoshizawa T, Inoue K, Kaitani K, Kurotobi T, Morishima I, Kusano K, Kimura T, Furukawa Y. The impact of catheter ablation for patients with asymptomatic atrial fibrillation: subanalysis of kansai plus atrial fibrillation (kpaf) registry. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0442] [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: 11/14/2022] Open
Abstract
Abstract
Background
Catheter ablation (CA) of atrial fibrillation (AF) for symptomatic patients improves the quality of life and prognosis of patients with heart failure. However, the impact of CA for asymptomatic patients is still controversial.
Purpose
We aimed to investigate the clinical outcomes of CA of AF for asymptomatic patients compared to those for symptomatic patients.
Methods
A total of 5,013 patients from the Kansai Plus Atrial Fibrillation (KPAF) Registry who underwent CA were screened. The patients were divided into three groups by type of AF; paroxysmal (PAF), persistent (PEAF) and long standing (LSAF) and the patients in each type of AF were divided into two groups: asymptomatic and symptomatic. The primary endpoint was recurrent supraventricular tachyarrhythmias lasting for more than 30 seconds during follow-up 4 years after CA. The secondary endpoint was a composite of cardiovascular, cerebral, and gastrointestinal events during follow-up 4 years after CA. The incidence of complications related to CA between asymptomatic and symptomatic patients was also evaluated. Kaplan–Meier analysis was employed to estimate the primary and secondary endpoints. The statistical differences in primary and secondary endpoints between asymptomatic and symptomatic patients were evaluated using a log–rank test. The impact of symptom due to AF on the primary and secondary endpoint was evaluated using a Cox hazard analysis. The difference in incidence of complications between asymptomatic and symptomatic patients was evaluated using a chi–square test.
Results
In this study population, PAF was the most frequent at 64.4%, followed by PEAF (22.7%) and LSAF (13.0%). There were some significant differences in the baseline characteristics between asymptomatic and symptomatic patients in each type of AF. The proportion of male was significantly higher in asymptomatic patients than symptomatic patients in PAF (81.2% versus 67.2%, p<0.001) and PEAF (86.4% versus 74.3%, p<0.001). Left atrial diameter was larger in asymptomatic patients than symptomatic patients only in PAF (40±6mm versus 38±6mm, p<0.001). In all types of AF, there was no significant difference in primary endpoint between asymptomatic and symptomatic patients as follows: 37.5% versus 40.6% (p=0.6) in PAF, 45.2% versus 55.1% (p=0.09) in PEAF and 59.3% versus 63.6% (p=1.0) in LSAF. There was also no significant difference in secondary endpoint between asymptomatic and symptomatic patients: 7.1% versus 6.8% (p=0.7) in PAF, 5.4% versus 8.7% (p=0.3) in PEAF and 4.4% versus 5.1% (p=0.5) in LSAF. In a Cox hazard analysis, the symptom did not affect both of the primary and secondary endpoints in each type of AF. In regard to the incidence of complications related to CA, there was no significant difference between asymptomatic and symptomatic patients in each type of AF.
Conclusion
CA of AF for asymptomatic patients can be safe and can lead to equivalent outcomes as well as symptomatic patients.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Pak
- Kobe City Medical Center General Hospital, Kobe, Japan
| | - A Kobori
- Kobe City Medical Center General Hospital, Kobe, Japan
| | - S Shizuta
- Kyoto University Graduate School of Medicine, Cardiovascular Medicine, Kyoto, Japan
| | - Y Sasaki
- Kobe City Medical Center General Hospital, Kobe, Japan
| | - T Toyota
- Kobe City Medical Center General Hospital, Kobe, Japan
| | - T Yoshizawa
- Kyoto University Graduate School of Medicine, Cardiovascular Medicine, Kyoto, Japan
| | - K Inoue
- Sakurabashi-Watanabe Hospital, Cardiovascular center, Osaka, Japan
| | - K Kaitani
- Japanese Red Cross Otsu Hospital, Otsu, Japan
| | - T Kurotobi
- Namba Kurotobi Heart Clinic, Osaka, Japan
| | | | - K Kusano
- National Cerebral & Cardiovascular Center, Suita, Japan
| | - T Kimura
- Kyoto University Graduate School of Medicine, Cardiovascular Medicine, Kyoto, Japan
| | - Y Furukawa
- Kobe City Medical Center General Hospital, Kobe, Japan
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10
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Fujiyoshi K, Minami M, Saito D, Hashimoto T, Yoshizawa T, Oikawa J, Tojo T, Yamaoka-Tojo M, Ako J. P178 Sinus rhythm restoration by catheter ablation improved cognitive function in elderly patients with atrial fibrillation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehz872.059] [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 fibrillation (AF) may cause cognitive impairment. However, the impact of sinus rhythm (SR) restoration by catheter ablation on the improvement of cognitive function remains to be elucidated.
Methods
A total of 57 consecutive elderly patients (70.8 ± 4.8 years old) who underwent catheter ablation for AF were prospectively enrolled. The change of cognitive function for 6 months was compared between patients with SR restoration (at least 3 months; n = 49) and patients with AF recurrence (n = 8). Cognitive function was evaluated by the mini-mental state examination (MMSE).
Results
There was no significant difference in baseline characteristics between the 2 groups, including MMSE score (27.3 ± 2.6 vs. 27.6 ± 1.5 points; p = 0.793). The change of MMSE score was significantly greater in patients with SR restoration than those with AF recurrence (0.28 ± 0.70 vs. − 0.50 ± 0.75 points; p = 0.006; Figure). The general liner modeling revealed that SR restoration (effect estimate, 0.369; 95% confidence interval, 0.110 to 0.627; p = 0.006) was independently associated with the change of MMSE score.
Conclusion
In elderly AF patients, successful restoration of SR by catheter ablation was associated with the improvement of cognitive function.
Abstract P178 Figure
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Affiliation(s)
- K Fujiyoshi
- Yamato Municipal Hospital, Cardiovascular Medicine, Yamato, Japan
| | - M Minami
- Kitasato University School of Medicine, Cardiovasucular medicine, Sagamihara, Japan
| | - D Saito
- Kitasato University School of Medicine, Cardiovasucular medicine, Sagamihara, Japan
| | - T Hashimoto
- Yamato Municipal Hospital, Cardiovascular Medicine, Yamato, Japan
| | - T Yoshizawa
- Yamato Municipal Hospital, Cardiovascular Medicine, Yamato, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Cardiovasucular medicine, Sagamihara, Japan
| | - T Tojo
- Yamato Municipal Hospital, Cardiovascular Medicine, Yamato, Japan
| | - M Yamaoka-Tojo
- Kitasato University School of Allied Health Sciences, Rehabilitation, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Cardiovasucular medicine, Sagamihara, Japan
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11
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Yoshizawa T, Shiomi H, Tanaka M, Aizawa T, Yamagami S, Komasa A, Kimura T, Shizuta S. P985The long-term impact of maintaining sinus rhythm on the risk for death or heart failure after catheter ablation for atrial fibrillation in a real world clinical practice. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0578] [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: 11/14/2022] Open
Abstract
Abstract
Background
Catheter ablation has been rapidly spread as a first line therapy for atrial fibrillation (AF). A recent randomized trial have shown that AF ablation reduces the risk of death or hospitalization for heart failure (HF). However, the impact of maintained sinus rhythm (SR) on long-term risk of death or HF hospitalization has not been adequately evaluated.
Purpose
To investigate the impact of maintaining SR by AF ablation on long-term risk of all-cause death or HF hospitalization.
Methods
The long-term clinical outcomes were compared between patients with maintained SR and those with recurrent AF using a landmark analysis in which the landmark point was set at 1.5-year after the 1st ablation.
Results
Among consecutive 1467 patients who underwent AF ablation in our institution between February 2004 and December 2017, the study population consisted of 1311 patients after excluding 150 patients because of death or lost to follow-up. Mean age was 67.9±0.3 and paroxysmal AF was 67%. Among 460 patients who had AF recurrence within 1.5 years after the 1st ablation, 328 underwent 2nd ablation. Therefore, at 1.5-year after the 1st AF ablation, 1145 patients had maintained SR rhythm (SR-group), and 166 patients had recurrent AF episodes (AF-group). During 4.7±2.4 years of follow-up, the cumulative 5-year incidence of death or HF beyond 1.5 years after the 1st ablation was 5.1% in SR-group and 15.6% in AF-group (log rank P<0.001). After adjusting for baseline confounders, the lower risk of SR-group relative to AF-group for death or HF was still statistically significant (HR: 2.05, 95% CI: 1.11–3.58, P=0.02).
Risks for a Composite of Death or HF Hazard Ratio (95% CI) Crude HR P value Adjusted HR P value AF recurrence 2.59 (1.43–4.43) 0.002 2.05 (1.11–3.58) 0.02 Age>75 years old 2.55 (1.56–4.10) <0.001 2.32 (1.39–3.81) 0.002 Female 0.85 (0.49–1.43) 0.56 0.73 (0.40–1.25) 0.26 PeAF 1.25 (0.68–2.16) 0.45 0.98 (0.52–1.75) 0.94 LSAF 1.10 (0.46–2.23) 0.82 0.70 (0.28–1.53) 0.39 LVEF>50% 0.27 (0.16–0.48) <0.001 0.57 (0.31–1.09) 0.09 Past history of HF 7.06 (4.18–11.6) <0.001 4.67 (2.51–8.41) <0.001 CKD 4.74 (2.08–9.39) <0.001 2.23 (0.94–4.69) 0.07 AF, Atrial fibrillation; PeAF, Persistent AF; LSAF; Long standing AF; HF, Heart failure; CKD, Chronic kidney disease.
Figure 1
Conclusions
Successfully maintained SR was associated with reduced long-term risk for death or HF hospitalization in real world patients undergoing AF ablation.
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Affiliation(s)
- T Yoshizawa
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - H Shiomi
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - M Tanaka
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - T Aizawa
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - S Yamagami
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - A Komasa
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - T Kimura
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - S Shizuta
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
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Inoue M, Uchino S, Iida A, Noguchi S, Hayashi S, Takahashi T, Fujii K, Komaki H, Takeshita E, Nonaka I, Yoshizawa T, Van Lommel L, Schuit F, Goto Y, Mimaki M, Nishino I. METABOLIC DISTURBANCES IN NEUROMUSCULAR DISEASES. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.020] [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: 10/25/2022]
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13
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Yoshizawa T, Shizuta S, Komasa A, Sasaki Y, Kobori A, Kimura T. P1101The second generation cryoballoon ablation is safe and useful for paroxysmal atrial fibrillation in super-elderly patients over 80 years: a report from two high-volume centers. Europace 2018. [DOI: 10.1093/europace/euy015.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T Yoshizawa
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - S Shizuta
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - A Komasa
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
| | - Y Sasaki
- Kobe City Medical Center General Hospital, Department of Cardiology, Kobe, Japan
| | - A Kobori
- Kobe City Medical Center General Hospital, Department of Cardiology, Kobe, Japan
| | - T Kimura
- Kyoto University Hospital, Caridovascular medecine, Kyoto, Japan
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14
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Tanoue H, Morinaga J, Yoshizawa T, Yugami M, Itoh H, Nakamura T, Uehara Y, Masuda T, Odagiri H, Sugizaki T, Kadomatsu T, Miyata K, Endo M, Terada K, Ochi H, Takeda S, Yamagata K, Fukuda T, Mizuta H, Oike Y. Angiopoietin-like protein 2 promotes chondrogenic differentiation during bone growth as a cartilage matrix factor. Osteoarthritis Cartilage 2018; 26:108-117. [PMID: 29074299 DOI: 10.1016/j.joca.2017.10.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 02/21/2017] [Revised: 08/30/2017] [Accepted: 10/10/2017] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Chondrocyte differentiation is crucial for long bone growth. Many cartilage extracellular matrix (ECM) proteins reportedly contribute to chondrocyte differentiation, indicating that mechanisms underlying chondrocyte differentiation are likely more complex than previously appreciated. Angiopoietin-like protein 2 (ANGPTL2) is a secreted factor normally abundantly produced in mesenchymal lineage cells such as adipocytes and fibroblasts, but its loss contributes to the pathogenesis of lifestyle- or aging-related diseases. However, the function of ANGPTL2 in chondrocytes, which are also differentiated from mesenchymal stem cells, remains unclear. Here, we investigate whether ANGPTL2 is expressed in or functions in chondrocytes. METHODS First, we evaluated Angptl2 expression during chondrocyte differentiation using chondrogenic ATDC5 cells and wild-type epiphyseal cartilage of newborn mice. We next assessed ANGPTL2 function in chondrogenic differentiation and associated signaling using Angptl2 knockdown ATDC5 cells and Angptl2 knockout mice. RESULTS ANGPTL2 is expressed in chondrocytes, particularly those located in resting and proliferative zones, and accumulates in ECM surrounding chondrocytes. Interestingly, long bone growth was retarded in Angptl2 knockout mice from neonatal to adult stages via attenuation of chondrocyte differentiation. Both in vivo and in vitro experiments show that changes in ANGPTL2 expression can also alter p38 mitogen-activated protein kinase (MAPK) activity mediated by integrin α5β1. CONCLUSION ANGPTL2 contributes to chondrocyte differentiation and subsequent endochondral ossification through α5β1 integrin and p38 MAPK signaling during bone growth. Our findings provide insight into molecular mechanisms governing communication between chondrocytes and surrounding ECM components in bone growth activities.
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Affiliation(s)
- H Tanoue
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan; Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - J Morinaga
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Yoshizawa
- Department of Medical Biochemistry, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - M Yugami
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan; Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - H Itoh
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan; Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - Y Uehara
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Masuda
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - H Odagiri
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Sugizaki
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Kadomatsu
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - K Miyata
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - M Endo
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - K Terada
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - H Ochi
- Department of Physiology and Cell Biology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - S Takeda
- Endocrine Center, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 05-8470, Japan
| | - K Yamagata
- Department of Medical Biochemistry, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - T Fukuda
- Department of Anatomy and Neurobiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - H Mizuta
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan
| | - Y Oike
- Department of Molecular Genetics, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo,Chuo-ku, Kumamoto 860-8556, Japan; Core Research for Evolutional Science and Technology (CREST), Japan Agency for Medical Research and Development (AMED), Tokyo, Japan.
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15
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Matsuda S, Hao A, Saito M, Yoshizawa T. Clinical features and outcomes of the paraneoplastic neurological syndromes: Our 7-year experience. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2101] [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]
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16
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Hao A, Saitoh M, Matsuda S, Yoshizawa T. Extrathymic malignancies in patients with myasthenia gravis. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3721] [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]
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17
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Sunami H, Shimizu Y, Denda J, Yokota I, Yoshizawa T, Uechi Y, Nakasone H, Igarashi Y, Kishimoto H, Matsushita M. Modulation of surface stiffness and cell patterning on polymer films using micropatterns. J Biomed Mater Res B Appl Biomater 2017; 106:976-985. [PMID: 28474403 DOI: 10.1002/jbm.b.33905] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 03/23/2017] [Accepted: 04/13/2017] [Indexed: 12/30/2022]
Abstract
Here, a new technology was developed to selectively produce areas of high and low surface Young's modulus on biomedical polymer films using micropatterns. First, an elastic polymer film was adhered to a striped micropattern to fabricate a micropattern-supported film. Next, the topography and Young's modulus of the film surface were mapped using atomic force microscopy. Contrasts between the concave and convex locations of the stripe pattern were obvious in the Young's modulus map, although the topographical map of the film surface appeared almost flat. The concave and convex locations of a polymer film supported by a different micropattern also contrasted clearly. The resulting Young's modulus map showed that the Young's modulus was higher at convex locations than at concave locations. Hence, regions of high and low stiffness can be locally generated based on the shape of the micropattern supporting the film. When cells were cultured on the micropattern-supported films, NIH3T3 fibroblasts preferentially accumulated in convex regions with high Young's moduli. These findings demonstrate that this new technology can regulate regions of high and low surface Young's modulus on a cellular scaffold with high planar resolution, as well as providing a method for directing cellular patterning. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 976-985, 2018.
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Affiliation(s)
- Hiroshi Sunami
- School of Medicine, University of Ryukyus, Nishihara, Japan
| | - Yusuke Shimizu
- School of Medicine, University of Ryukyus, Nishihara, Japan
| | - Junko Denda
- School of Medicine, University of Ryukyus, Nishihara, Japan
| | - Ikuko Yokota
- Frontier Research Center for Post-genome Science and Technology, Hokkaido University Faculty of Advanced Science, Sapporo, Japan
| | - Tomokazu Yoshizawa
- Creative Research Institution (CRIS), Hokkaido University, Sapporo, Japan
| | - Yukiko Uechi
- School of Medicine, University of Ryukyus, Nishihara, Japan
| | | | - Yasuyuki Igarashi
- Frontier Research Center for Post-genome Science and Technology, Hokkaido University Faculty of Advanced Science, Sapporo, Japan
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Shiba N, Miyazakaki D, Yoshizawa T, Fukushima K, Imamura M, Takeda S, Nakamura A. Ablation of MMP-9 promotes resolution of inflammation and regeneration by modulating chemotaxis in early stage but exacerbates fibrosis in late stage in mdx mice. Neuromuscul Disord 2015. [DOI: 10.1016/j.nmd.2015.06.383] [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: 11/29/2022]
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19
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Kato N, Yoshizawa T, Sakai H. Simultaneous modified Camitz opponensplasty using a pulley at the radial side of the flexor retinaculum in severe carpal tunnel syndrome. J Hand Surg Eur Vol 2014; 39:632-6. [PMID: 23860307 DOI: 10.1177/1753193413498328] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [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] [Indexed: 02/03/2023]
Abstract
Camitz opponensplasty using the palmaris longus has been used in patients undergoing open carpal tunnel release. It is considered to have several advantages over other opponensplasty techniques, but it provides weak flexion and pronation, which are prerequisites for opposition. To address this shortcoming, we have used a modified Camitz procedure with a pulley at the radial side of the dissected flexor retinaculum and have assessed the results in comparison with the conventional Camitz procedure. Both procedures provided significant improvements in palmar abduction and Disabilities of the Arm, Shoulder, and Hand and Kapandji scores at 3 months post-operatively, but patients who underwent the modified Camitz procedure showed better improvement in pulp pinch, palmar abduction, and thumb pronation.
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Affiliation(s)
- N Kato
- Department of Orthopedic Surgery, Saitama Medical Center, Saitama Medical University, Kawagoe City, Saitama, Japan
| | - T Yoshizawa
- Department of Orthopedic Surgery, Saitama Medical Center, Saitama Medical University, Kawagoe City, Saitama, Japan
| | - H Sakai
- Department of Orthopedic Surgery, Saitama Medical Center, Saitama Medical University, Kawagoe City, Saitama, Japan
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Affiliation(s)
- K Okazaki
- Department of Bioresource Science, Faculty of Agriculture, Kagawa University, Japan
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21
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Oikawa J, Niwano S, Ishizue N, Yoshizawa T, Satoh A, Kurokawa S, Hatakeyama Y, Fukaya H, Niwano H. Use of statins suppress the shorting of the fibrillation cycle length in patients with new-onset atrial fibrillation -Possible anti-remodeling effect of statin for atrial structural remodeling. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4964] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Yoshizawa T, Yoshiga A, Nakagawa H. Chromatic and spatial information in visual estimation of freshness of vegetables. J Vis 2012. [DOI: 10.1167/12.14.56] [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: 11/24/2022] Open
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23
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Nakamura K, Nagata D, Kajikawa K, Kobayashi I, Zennami K, Nishikawa G, Yoshizawa T, Tobiume M, Aoki S, Yamada Y, Sumitomo M. Retroperitoneal approach for laparoscopic nephroureterectomy with stripping technique: extracorporeal ligation of ureter and ureteral catheter. Asian J Endosc Surg 2012; 5:42-5. [PMID: 22776343 DOI: 10.1111/j.1758-5910.2011.00110.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 11/27/2022]
Abstract
INTRODUCTION The pluck and stripping techniques are used for lower ureter management in renal pelvic cancer patients. Herein, we report our experience of extracorporeal ligation of the ureter and the ureteral catheter through the trocar port, which differs from conventional laparoscopic ligation in the retroperitoneal space. This technique was selected to reduce the time needed for ureter management using the stripping technique and to provide secure ligation. MATERIALS AND SURGICAL TECHNIQUE We performed this stripping technique in patients with T1 and T2 stage renal pelvic cancer without imaging-evident lymph node metastasis. After transurethrally placing a ureteral catheter, we resected the circumference of the ureteral orifice. After laparoscopic nephrectomy via a retroperitoneal approach, the ureteral catheter and distal ureter were ligated extracorporeally. The catheter was pulled to invaginate the ureter so it could then be pulled through the external urethral orifice. DISCUSSION This technique of extracorporeal ligation ensures more a secure ligation of the ureter and ureteral catheter. This modified stripping technique does not require lower ureter management with laparotomy, and it is also useful in shortening the operative time. This method is effective for relatively early stage renal pelvic cancer.
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Affiliation(s)
- K Nakamura
- Department of Urology, Aichi Medical University School of Medicine, Nagakute, Japan.
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24
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Yoshizawa T, Uruno Y, Kawahara T. Effects of physical acceleration in the perception of induced self-motion by a real world display. J Vis 2011. [DOI: 10.1167/11.11.902] [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: 11/24/2022] Open
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25
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Yoshizawa T, Shimizu T, Hirano H, Sato M, Hashimoto H. Structural basis of inhibition mechanism by carrot EDGP against endoglucanase. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311084017] [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: 11/11/2022] Open
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Hashimoto H, Hara K, Hishiki A, Kawaguchi S, Yoshizawa T, Unzai S, Tamaru Y, Shimizu T, Sato M. Crystal structure of zinc-finger domain of Nanos and its functional implications. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311094566] [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: 11/10/2022] Open
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Ogikubo S, Nakabayashi T, Adachi T, Islam MS, Yoshizawa T, Kinjo M, Ohta N. Intracellular pH sensing using autofluorescence lifetime microscopy. J Phys Chem B 2011; 115:10385-90. [PMID: 21776989 DOI: 10.1021/jp2058904] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence lifetime images of reduced nicotinamide adenine dinucleotide (NADH) that is a key cofactor in cellular metabolism were obtained in a cell at various values of intracellular pH. The average fluorescence lifetime of NADH is found to become shorter monotonically with increasing pH, indicating that pH in a single cell can be determined by fluorescence lifetime imaging of NADH without adding exogenous fluorescent probes. The magnitude of the pH-induced lifetime change is higher in cells than that in buffer solution. The fluorescence lifetime of NADH is not uniform inside a cell; the fluorescence lifetime of nuclear NADH is shorter than that of mitochondrial NADH at each pH, and the magnitude of the pH-induced change is larger in nuclei than in other areas. The local electric field effect on the fluorescence lifetime is discussed since this effect may be one of the strong possibilities for the nonuniformity of the autofluorescence lifetime of NADH in cells.
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Affiliation(s)
- Shinya Ogikubo
- Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan
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Matsumoto K, Nagahara A, Sakamoto N, Suyama M, Konuma H, Morimoto T, Sagawa E, Ueyama H, Takahashi T, Beppu K, Shibuya T, Osada T, Yoshizawa T, Ogihara T, Watanabe S. A new traction device for facilitating endoscopic submucosal dissection (ESD) for early gastric cancer: the "medical ring". Endoscopy 2011; 43 Suppl 2 UCTN:E67-8. [PMID: 21341187 DOI: 10.1055/s-0030-1255923] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- K Matsumoto
- Department of Gastroenterology, Juntendo University School of Medicine, Tokyo, Japan.
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Yoshizawa T, Tagami S, Tanaka Y, Kawahara T, Kojima H. Asymmetric effect of contrast on the size perception of Gabor patterns. J Vis 2010. [DOI: 10.1167/10.15.64] [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: 11/24/2022] Open
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Konno S, Aoki T, Miyamoto M, Gembun Y, HoriguchI G, Yoshizawa T, Ito H. P3-17 The effects on the reliability of reading parameters of F-waves by flattening the baselines of the waveforms using a mathematical approximation. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60485-3] [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: 11/26/2022]
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Yumbe-Guevara BE, Imoto T, Yoshizawa T. Effects of heating procedures on deoxynivalenol, nivalenol and zearalenone levels in naturally contaminated barley and wheat. ACTA ACUST UNITED AC 2010; 20:1132-40. [PMID: 14726277 DOI: 10.1080/02652030310001620432] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [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: 10/26/2022]
Abstract
The influence of heating temperature and time on deoxynivalenol (DON), nivalenol (NIV) and zearalenone (ZEA) contents in naturally co-contaminated barley and wheat was investigated intending to establish the basis for a decontamination model of Fusarium mycotoxins in cereals. The standard toxins and whole barley powder samples were heated in a convection oven at 140, 160, 180, 200, or 220 degrees C, and kernel subsamples (200 g each) were roasted in an experimental rotary gas-fired roaster at 150, 180 or 220 degrees C. All treatments resulted in a time-temperature-dependent decomposition of the toxins; the logarithm of the toxin remaining % presented a linear relationship with heating time. The lines equations were used to estimate the half (H) and decimal (D) decomposition times (time required to destroy 50 or 90% of the toxin, respectively). DON and NIV H and D decomposition times were similar and 50% shorter for heated standards than for whole barley powder. ZEA standard values were considerably longer, while whole barley powder values were comparable with those of DON and NIV. At 220 degrees C, D decomposition times of DON, NIV and ZEA heated standards were 11, 10 and 85 min, respectively, while the values obtained in whole barley powder were the same for the three toxins (25 min). The determination of H and D decomposition values constitutes a basis to understand the heating stability nature of each toxin.
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Anderson D, Yoshizawa T, Gollschewski S, Atogami F, Courtney M. Menopause in Australia and Japan: effects of country of residence on menopausal status and menopausal symptoms. Climacteric 2010; 7:165-74. [PMID: 15497905 DOI: 10.1080/13697130410001713760] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [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: 10/26/2022]
Abstract
OBJECTIVES The aim of the study was to explore the effects of country of residence on menopausal status and menopausal symptoms in Australian and Japanese women. The study objectives included exploring the impact of country of residence (Australia and Japan) and menopausal status on menopausal symptoms, and identifying whether country of residence (Australia and Japan) moderates the relationship between menopausal status and menopausal symptoms. METHODS Analyses are based on 1743 women aged between 40 and 60 years who participated in the multi-race, multi-site, cross-sectional study of mid-aged women called the Australian and Japanese Midlife Women's Health Study (AJMWHS) in 2001--2002. Study participants completed a mailed questionnaire that contained questions on a variety of health-related topics. RESULTS In both cultures there was a similar increase in prevalence of depression (p < 0.001), somatic symptoms (p < 0.001) and vasomotor symptoms (p < 0.001) at perimenopause. Australian women experienced more night sweats than Japanese women but the prevalence of hot flashes was not statistically different. Postmenopausal Japanese women had more somatic, psychological and sexual symptoms. The main effect for menopausal status and the interaction effect of country of residence was significant in the somatic symptoms (p < 0.001), but not in any of the other areas. CONCLUSIONS Vasomotor, psychological and somatic symptoms decrease after menopause in Australian women, with only sexual symptoms continuing. In Japanese women, somatic, psychological and sexual symptoms remain high after menopause. It is possible that westernization may be having a significant impact on the aging of women in Japan and it is, therefore important to capture through research just what this impact may be.
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Affiliation(s)
- D Anderson
- Centre for Health Research, Queensland University of Technology, Brisbane, Australia
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35
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Yoshizawa T, Hawken MJ. Effects of luminance and isoluminant masking noise on second-order chromatic smooth motion. J Vis 2010. [DOI: 10.1167/2.7.370] [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: 11/24/2022] Open
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36
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Takahashi S, Obinata D, Sakuma T, Matsui T, Takenobu Y, Igarashi T, Yoshizawa T, Sato K, Mochida J, Sugimoto S. Transvaginal mesh (TVM) reconstruction with TVT/TOT sling for vaginal prolapse concurrent with stress urinary incontinence. Aktuelle Urol 2010; 41 Suppl 1:S20-3. [PMID: 20094946 DOI: 10.1055/s-0029-1224661] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
We evaluated clinical efficacies of transvaginal mesh (TVM) reconstruction alone and those concomitant with a TVT/TOT sling for the treatment of pelvic organ prolapse (POP) and stress urinary incontinence (SUI). Between January 2006 and February 2007, 138 female patients with POP underwent TVM reconstruction. The mean age was 66.6 years (range: 52-84). Fourteen individuals were qualified as grade II in the POP quantification (POP-Q) system, 85 and 39 were grades III and IV, respectively. One hundred and seventeen of 138 (85 %) cases showed SUI. Twenty-one patients without SUI underwent TVM alone, and 117 cases with SUI underwent TVM concomitant with TVT/TOT sling. Mean operation time and intra-operative bleeding was 79 min (range: 25-177) and 74 ml (range: 10-429), respectively. Mean follow-up period is 5.3 months (range: 1-14). The vaginal prolapses were cured (grade 0) in 129 cases (93 %) after the surgery. Total inter-national prostate symptom score (IPSS), its QOL score, International Consultation on Incontinence Questionnaires Short Form (ICIQ-SF) significantly improved (from 12.6 to 3.9; p < 0.0001, from 5.0 to 1.0; p < 0.0001, and from 6.1 to 2.5; p < 0.01, respectively). Six of 21 cases (29%) who underwent TVM alone showed postoperative de-novo SUI. In contrast, 116 cases (99%) who underwent TVM concomitant with TVT/TOT, experienced a cure of SUI. Maximum flow rate did not change postoperatively in the both groups. In conclusion, the short-term efficacies of TVM reconstruction for POP are excellent, and a concomitant TVT/TOT sling prevents postoperative SUI.
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Asaoka D, Nagahara A, Oguro M, Kurosawa A, Osada T, Kawabe M, Hojo M, Yoshizawa T, Otaka M, Ogihara T, Watanabe S. Utility of autofluorescence imaging videoendoscopy in screening for Barrett's esophagus. Endoscopy 2009; 41 Suppl 2:E113. [PMID: 19544253 DOI: 10.1055/s-0029-1214630] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- D Asaoka
- Department of Gastroenterology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan.
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Sasai K, Iwai H, Yoshizawa T, Nishimoto S, Shibamoto Y, Kitakabu Y, Oya N, Takahashi M, Abe M. Pharmacokinetics of Fluorinated 2-nitroimidazole Hypoxic Cell Radiosensitizers in Murine Peripheral Nervous Tissue. Int J Radiat Biol 2009; 62:221-7. [PMID: 1355516 DOI: 10.1080/09553009214552041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [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: 10/23/2022]
Abstract
We have previously reported that KU-2285, a 2-nitroimidazole with a fluorinated N1-substituent (-CH2-CF2CONH(CH2)nOH, n = 2), was a promising hypoxic cell radiosensitizer. In this study the pharmacokinetics of KU-2285 and its related compounds (n = 3 and n = 4) were compared with those of etanidazole (a 2-nitroimidazole with an N1-substituent of -CH2CONH(CH2)nOH, n = 2) and its related compounds (n = 3 and n = 4) to assess the effects of incorporation of a CF2 group. The lipophilicity of the fluorinated compounds was higher than that of etanidazole, as measured by the octanol/water partition coefficient. As the number of CH2 groups increased, the lipophilicity of the compounds in both the KU-2285 and etanidazole series increased. The brain tissue levels of the fluorinated compounds were as low as those of the etanidazole derivatives, while the biological half-lives of the fluorinated compounds in peripheral nervous tissues were shorter than those of related non-fluorinated compounds.
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Affiliation(s)
- K Sasai
- Department of Radiology, Faculty of Medicine, Kyoto University, Japan
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Asaoka D, Nagahara A, Kurosawa A, Osada T, Kawabe M, Hojo M, Yoshizawa T, Otaka M, Ohkusa T, Ogihara T, Watanabe S. Utility of autofluorescence imaging videoendoscopy system for the detection of minimal changes associated with reflux esophagitis. Endoscopy 2008; 40 Suppl 2:E172-3. [PMID: 18668460 DOI: 10.1055/s-2007-995803] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- D Asaoka
- Department of Gastroenterology, Juntendo University School of Medicine, Tokyo, Japan
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Yoshizawa T, Hashimoto H, Shimizu T, Hirano H, Sato M. Crystallographic study of extracellular dermal glycoprotein of carrot. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308092337] [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: 11/11/2022] Open
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41
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Chi YM, Nakamura M, Zhao XY, Yoshizawa T, Yan WM, Hashimoto F, Chi YC, Kinjo J, Nohara T. A novel macrocyclic spermine alkaloid from Incarvillea sinensis. J Asian Nat Prod Res 2007; 9:115-8. [PMID: 17454308 DOI: 10.1080/10286020500289212] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A novel macrocyclic spermine alkaloid incasine C' (1), along with a known compound incasine C (2), were isolated from the whole plants of Incarvillea sinensis, and their structures were elucidated on the basis of chemical and spectroscopic evidence.
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Affiliation(s)
- Y-M Chi
- Seiwa Pharmaceutical, Ltd., Ibaraki, Japan.
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Ara AM, Iimori T, Yoshizawa T, Nakabayashi T, Ohta N. External Electric Field Effects on Fluorescence of Pyrene Butyric Acid in a Polymer Film: Concentration Dependence and Temperature Dependence. J Phys Chem B 2006; 110:23669-77. [PMID: 17125325 DOI: 10.1021/jp063865t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fluorescence spectra and electrofluorescence spectra (plots of the electric field-induced change in fluorescence intensity as a function of wavelength) have been measured at different temperatures for pyrene butyric acid (PBA) in a PMMA film at different concentrations. At a low concentration of 0.5 mol % where fluorescence emitted from the locally excited state of PBA (LE fluorescence) is dominant, LE fluorescence spectra show only the Stark shift in the presence of an electric field (F), which results from the difference in molecular polarizability between the ground and emitting states. At a high concentration of 10 mol % where the so-called sandwich-type excimer fluorescence (EX(1)) is dominant, both EX(1) and LE fluorescence are quenched by F. Another fluorescence assigned to a partially overlapped excimer (EX(2)) also exists at room temperature, and this emission is enhanced by F. As the temperature decreases, three fluorescence emissions whose electric field effects are different from each other become clear besides EX(1) and LE fluorescence, indicating that at least five fluorescence components exist at high concentrations at low temperatures. At a medium concentration of 5 mol % where EX(1) is comparable in intensity to the LE fluorescence, the intensity of EX(1) is not affected by F at any temperature, but LE fluorescence and EX(2) are markedly influenced by F at room temperature, and four fluorescence emissions are confirmed at low temperatures.
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Affiliation(s)
- Anjue Mane Ara
- Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan
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Mehata MS, Iimori T, Yoshizawa T, Ohta N. Electroabsorption Spectroscopy of 6-Hydroxyquinoline Doped in Polymer Films: Stark Shifts and Orientational Effects. J Phys Chem A 2006; 110:10985-91. [PMID: 16986830 DOI: 10.1021/jp063927f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stark absorption spectroscopy was applied to 6-hydroxyquinoline (6-HQ) doped in polymer films of poly(methyl methacrylate) (PMMA) and poly(vinyl alcohol) (PVA) at temperatures of 50-300 K. The electroabsorption (E-A) spectrum of 6-HQ markedly depends on temperature in a PMMA film. The polarization dependence as well as the temperature dependence of the E-A spectra reveals that 6-HQ is oriented along the direction of the applied electric field at room temperature in a PMMA film. As the temperature becomes lower, the field-induced orientation of 6-HQ is restricted, and only the Stark shift induced by a change in electric dipole moment and in molecular polarizability is observed. On the other hand, E-A spectra of 6-HQ doped in a PVA film are essentially independent of temperature, suggesting that 6-HQ is not oriented along the electric field even at room temperature in PVA. These results show that the molecular motion of 6-HQ in a polymer film is very sensitive to the microenvironment of the surrounding matrix.
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Affiliation(s)
- Mohan Singh Mehata
- Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan
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Aoki T, Konno S, Horiguchi G, Yoshizawa T, Ito H. P15.7 Sensory conduction study of carpal tunnel syndrome with inching technique. Clin Neurophysiol 2006. [DOI: 10.1016/j.clinph.2006.06.349] [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: 11/24/2022]
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Ara AM, Iimori T, Yoshizawa T, Nakabayashi T, Ohta N. External electric field effects on fluorescence of perylene doped in a polymer film. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ali N, Hashim NH, Saad B, Safan K, Nakajima M, Yoshizawa T. Evaluation of a method to determine the natural occurrence of aflatoxins in commercial traditional herbal medicines from Malaysia and Indonesia. Food Chem Toxicol 2005; 43:1763-72. [PMID: 16019122 DOI: 10.1016/j.fct.2005.05.019] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [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: 10/26/2004] [Revised: 05/16/2005] [Accepted: 05/24/2005] [Indexed: 11/23/2022]
Abstract
Traditional herbal medicines, popularly known as 'jamu' and 'makjun' in Malaysia and Indonesia, are consumed regularly to promote health. In consideration of their frequent and prolonged consumption, the natural occurrence of aflatoxins (AF) in these products was determined using immunoaffinity column clean-up and high-performance liquid chromatography with pre-column derivatization. The evaluated method, which entails dilution of sample extracts with Tween 20-phosphate buffered saline (1:9, v/v) and a chromatographic system using isocratic mobile phase composed of water-methanol-acetonitrile (70:20:10, v/v/v), was effective in separating AFB1, AFG1 and AFG2 from interference at their retention times. Results were confirmed using post-column derivatization with photochemical reactor. For 23 commercial samples analyzed, mean levels (incidence) of AFB(1), AFB(2) and AFG1 in positive samples were 0.26 (70%), 0.07 (61%) and 0.10 (30%) microg/kg, respectively; one sample was positive for AFG2 at a level of 0.03 (4%) microg/kg. In contrast to the high levels of AF in crude herbal drugs and medicinal plants reported previously by other researchers, the low contamination levels reported in this study may be attributed to the higher selectivity to AF of the method applied. Based on the AFB1 levels and the daily consumption of positive samples, a mean probable daily intake of 0.022 ng/kg body weight was calculated.
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Affiliation(s)
- N Ali
- Department of Biochemistry and Food Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan
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Kitamura N, Sakuda E, Yoshizawa T, Iimori T, Ohta N. Spectroscopic and Excited-State Properties of Tri-9-anthrylborane II: Electroabsorption and Electrofluorescence Spectra. J Phys Chem A 2005; 109:7435-41. [PMID: 16834112 DOI: 10.1021/jp050702g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electroabsorption and electrofluorescence spectroscopies were conducted for tri-9-anthrylborane (TAB) doped in poly(methyl methacrylate) films (1.0 mol %) to reveal the spectroscopic and excited-state properties of the compound. TAB showed three distinct absorption bands: bands I [(19 - 25) x 10(3) cm(-1)], II [(25-31) x 10(3) cm(-1)], and III (>31 x 10(3) cm(-1)). The electroabsorption spectrum demonstrated that the electronic transitions in bands I and III accompanied electric dipole moment changes (Deltamu), while the change in the molecular polarizability contributed mainly to electroabsorption band II. Because of the similarities of the electroabsorption spectrum of band II with that of anthracene itself, band II was assigned to the electronic transition to the locally excited (LE) state of the anthryl group. On the other hand, bands I and III were best described by the electronic transitions to the excited charge-transfer (CT) states. The study demonstrated furthermore that the Deltamu value of TAB accompanied by the lowest-energy electronic transition was as large as 7.8 D, which agreed very well with that determined by the solvent dependences of the absorption and fluorescence maximum energies of TAB (approximately 8.0 D, ref 1): Deltamu = 7.8-8.0 D. The results proved explicitly that the excited state of TAB was localized primarily on the p orbital of the boron atom. Despite the dipole moment change (Deltamu = 7.8-8.0 D) for the lowest-energy electronic transition (band I), the electrofluorescence of TAB accompanied the change in the molecular polarizability. The spectroscopic and excited-state properties of TAB including the curious behavior of the electrofluorescence spectrum as mentioned above were discussed on the basis of theoretical considerations.
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Affiliation(s)
- Noboru Kitamura
- Division of Chemistry, Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan.
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Sales AC, Azanza PV, Yoshizawa T. Microbiological and physicochemical factors affecting Aspergillus section Flavi incidence in Cavendish banana (Musa cavendishii) chips production in Southern Philippines. Mycopathologia 2005; 159:41-51. [PMID: 15750731 DOI: 10.1007/s11046-004-3640-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 08/02/2004] [Accepted: 09/21/2004] [Indexed: 10/25/2022]
Abstract
Microbiological and physicochemical factors affecting the incidence of Aspergillus section Flavi in dried Cavendish banana (Musa cavendishii) chips production in Southern Philippines were examined. The average counts of Aspergillus section Flavi (AFC) in fresh and dried Cavendish bananas from 10 production batches of the Philippine Agro-Industrial Development Cooperative in Davao del Norte, Southern Philippines were 1.2 x 10(2) and 1.6 x 10(2) cfu/g, respectively. Isolates from both samples were identified to be Aspergillus flavus based on spore type and conidial structure of isolates. An increasing trend in the AFC of Cavendish bananas was observed during dried banana chips processing. Variability in the AFC between production batches was attributed to differences in aerobic and fungal populations and physicochemical characteristics of the fruits, peel damage of the raw materials, concentration of AFC in the air and food-contact surfaces of the production area, and temperature and relative humidity (RH) conditions of the environment during production and storage. Physicochemical characteristics of Cavendish bananas from the receipt of raw materials up to the first day of drying were within the reported range of values allowing growth and toxin production by aflatoxigenic fungi. Air-borne AFC varied depending on the section of the production area examined. The close proximity of the waste disposal area from the production operation to the preparation, drying and storage areas suggests that cross-contamination, probably air-borne or insect-borne was a likely occurrence. The hands of workers were also identified as AFC sources. Results of this study highlight the need for the development of strategies to control aflatoxigenic fungi and aflatoxin contamination in Philippine dried Cavendish bananas.
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Affiliation(s)
- A C Sales
- Department of Biochemistry and Food Science, Faculty of Agriculture, Kagawa University, Miki, 761-0795 Kagawa, Japan.
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Iimori T, Ara AM, Yoshizawa T, Nakabayashi T, Ohta N. Remarkable temperature dependence of electric field-induced change in fluorescence spectra of pyrene doped in a polymer matrix. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2004.12.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Yoshizawa T, Iwaki Y, Osaka N, Nakabayashi T, Zachariasse KA, Ohta N. External Electric Field Effects on Absorption, Fluorescence and Phosphorescence Spectra of 4-(Dimethylamino)benzonitrile in a Polymer Film. J Phys Chem B 2004. [DOI: 10.1021/jp040012x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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)
- Tomokazu Yoshizawa
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Yuji Iwaki
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Naoki Osaka
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Takakazu Nakabayashi
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Klaas A. Zachariasse
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Nobuhiro Ohta
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
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