1
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Oikawa J, Sakai J, Fujiwara Y, Tsurusawa K, Shimao D, Date H, Sugimori H. Energy spectrum measurement of scattered X-rays during IVR procedure. Radiat Prot Dosimetry 2024; 200:181-186. [PMID: 38038052 DOI: 10.1093/rpd/ncad290] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 10/29/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023]
Abstract
With the increase of the number of interventional radiology (IVR) procedures, the occupational exposure of operators and medical staff has attracted keen attention. The energy of scattered radiation in medical clinical sites is important for estimating the biological effects of occupational exposure. Recent years have seen many reports on the dose of scattered radiation by IVR, but few on the energy spectrum. In this study, the energy spectrum of scattered X-rays was measured by using a cadmium telluride (CdTe) semiconductor detector during IVR on several neurosurgical and cardiovascular cases. The cumulated spectra in each case were compared. The spectra showed little changes among neurosurgical cases and relatively large changes among cardiovascular cases. This was assumed to be due to the change of X-ray tube voltage and tube angle was larger in cardiovascular cases. The resulting energy spectra will be essential for the assessment of detailed biological effects of occupational exposure.
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Affiliation(s)
- Joma Oikawa
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo 060-0812, Japan
- Department of Radiology, Sapporo Shuyukai Hosipital, 6-2-1, Shinhassamu 5-jo, Teine-ku, Sapporo 006-0805, Japan
| | - Jun Sakai
- Department of Radiology, Sapporo Shuyukai Hosipital, 6-2-1, Shinhassamu 5-jo, Teine-ku, Sapporo 006-0805, Japan
| | - Yusuke Fujiwara
- Department of Neurosurgery, Sapporo Shuyukai Hospital, 6-2-1, Shinhassamu 5-jo, Teine-ku, Sapporo 006-0805, Japan
| | - Kota Tsurusawa
- Department of Radiology, Sapporo Higashi Tokushukai Hospital, N33-E14, Higashi-ku, Sapporo 065-0033, Japan
| | - Daisuke Shimao
- Department of Radiological Technology, Faculty of Health Sciences, Hokkaido University of Science, 15-4-1, Maeda 7-jo, Teine-ku, Sapporo 006-8585, Japan
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroyuki Sugimori
- Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo 060-0812, Japan
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2
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Murayama Y, Kitasato L, Ishizue N, Suzuki M, Mitani Y, Saito D, Matsuura G, Sato T, Kobayashi S, Nakamura H, Oikawa J, Kishihara J, Fukaya H, Niwano S, Ako J. Evaluation of the direct protective effects of Canagliflozin on the Isoproterenol-induced cell injury in rat cardiomyocytes. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2927] [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
Sodium-glucose cotransporter-2 (SGLT2) inhibitors are agents that act by inhibiting glucose and sodium reabsorption in the proximal renal tubule which promotes urinary glucose excretion. More recently, significant benefit data of SGLT2 inhibitors in patients with heart failure, independent of the presence of type 2 diabetes has been reported. We have previously demonstrated that Canagliflozin (Cana), a SGLT2 inhibitor, reduced the ventricular effective refractory period in isoproterenol (ISP)-induced myocardial injury rat model accompanied with the suppression of reactive oxygen species and the elevation of ketone bodies, suggesting the effect of Cana on electrical cardiac remodeling. The direct effect of Cana to the cardiomyocytes and its underlying molecular mechanism was remained to be clarified. We therefore established an ISP-induced neonatal rat ventricular cardiomyocyte (NRVCM) in vitro model, pretreated with Cana and/or ketone bodies.
Methods
Primary NRVCM were isolated from Wistar rats, were pretreated by Cana with or without βOHB (the most abundant ketone body in circulation), followed by a stimulation of ISP (10μM). Cells without drug or ketone body pretreatment were used as control. We then analyzed its effect on cell viability, apoptosis, and mitochondrial membrane potential using MTT assay, TUNEL assay, and mitochondrial membrane potential assay, respectively. MTT assay was also performed with or without PI3k inhibitor, LY294002. The end-labeling of DNA fragmentation were labelled with FITC, followed by the nuclei counterstain with DAPI and were observed with confocal microscope. The apoptotic index was defined as the percentage of TUNEL positive cells / total nuclei.
Results
Cana rescued the reduction of NRVCM cell viability induced by ISP stimulation for 24 hours which was inhibited by LY294002 compared to cells without pretreatment. Interestingly, pretreatment of βOHB with or without Cana improved also the NRCVM cell viability whereas there was no significant difference between these two conditions or with cells treated with Cana only, suggesting the direct protective effect of Cana. In 48 hours of ISP stimulation, the apoptotic index intends to decrease in Cana and/or βOHB compared to cells without pretreatment (Figure 1). Although the mitochondrial function was maintained in Cana-pretreated cells compared to cells without pretreatment, there was no significant difference in βOHB-pretreated cells.
Conclusions
Cana has a direct protective effect on cardiomyocytes cell viability, apoptosis as well as the mitochondrial function impaired by ISP through the cell survival signaling PI3K/Akt pathway. This brings a new insight to the therapeutic target of cardiovascular disease.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- Y Murayama
- Kitasato University School of Medicine , Sagamihara , Japan
| | - L Kitasato
- Kitasato University School of Medicine , Sagamihara , Japan
| | - N Ishizue
- Kitasato University School of Medicine , Sagamihara , Japan
| | - M Suzuki
- Kitasato University School of Medicine , Sagamihara , Japan
| | - Y Mitani
- Kitasato University School of Medicine , Sagamihara , Japan
| | - D Saito
- Kitasato University School of Medicine , Sagamihara , Japan
| | - G Matsuura
- Kitasato University School of Medicine , Sagamihara , Japan
| | - T Sato
- Kitasato University School of Medicine , Sagamihara , Japan
| | - S Kobayashi
- Kitasato University School of Medicine , Sagamihara , Japan
| | - H Nakamura
- Kitasato University School of Medicine , Sagamihara , Japan
| | - J Oikawa
- Kitasato University School of Medicine , Sagamihara , Japan
| | - J Kishihara
- Kitasato University School of Medicine , Sagamihara , Japan
| | - H Fukaya
- Kitasato University School of Medicine , Sagamihara , Japan
| | - S Niwano
- Kitasato University School of Medicine , Sagamihara , Japan
| | - J Ako
- Kitasato University School of Medicine , Sagamihara , Japan
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3
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Shimao D, Tsurusawa K, Oikawa J, Sakai J. Measurement of scattered radiation spectrum during x-ray fluoroscopy for the precise estimation of examiner’s lens exposure. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00539-7] [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: 10/19/2022] Open
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4
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Ishizue N, Fukaya H, Saito D, Matsuura G, Sato T, Kobayashi S, Shirakawa Y, Arakawa Y, Oikawa J, Kishihara J, Niwano S, Ako J. Prognostic impact of atrial fibrillation under oral anticoagulation therapy in patients with type B acute aortic dissection. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2012] [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
Patients with acute aortic dissection (AAD) sometimes are complicated with atrial fibrillation (AF). However, the impact of AF and the use of oral anticoagulation (OAC) on the prognosis of AAD remains unclear. In this study, we evaluated the prognostic impact of AF and OAC therapy in patients with type B AAD.
Methods
Consecutive patients diagnosed with type B AAD between January 2010 and December 2020 in our university hospital were retrospectively analyzed. All patients were divided into 2 groups based on the concomitance with or without AF. The primary endpoint was set as major adverse cardiovascular events (MACEs), including all-cause death, enlargement of aortic diameter, aortic ruptures, and cerebral infarction. Kaplan-Meier survival curves were constructed, and Cox proportional hazards analysis was performed to identify independent predictors of clinical events at 1 year.
Results
A total of 146 patients diagnosed with type B AAD were enrolled, with a mean age of 66±12 years, and 81% of male. Thirty-two patients (22%) experienced MACEs during 272±142 days-observation. Concomitant AF was observed in 27 patients (18%). In the Kaplan-Meier curve analysis, the patients with AF showed significantly higher events than those without AF (log-lank p<0.001). In the multivariate Cox proportional hazards models, presence of AF (HR: 2.402, 95% CI: 1.099–4.978 p=0.029), maximum descending aorta diameter (HR: 1.0366, 95% CI: 1.005–1.064 p=0.023), and age>75 years (HR: 2.635, 95% CI: 1.268–5.388 p=0.011) were independent predictors of MACEs. Regarding OAC in patients with AF, Kaplan-Meier analysis showed that usage of OAC was associated with a higher incidence of MACEs than those without (log-rank, p=0.036)
Conclusion
Presence of AF, enlargement of descending aorta diameter, and age were independent predictors of future MACEs in patients with type B AAD. Additionally, usage of OAC is associated with MACEs in patients with type B AAD complicated with AF.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- N Ishizue
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - D Saito
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - G Matsuura
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - T Sato
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Kobayashi
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Shirakawa
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
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5
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Matsuura G, Fukaya H, Ogawa E, Kawakami S, Saito D, Sato T, Arakawa Y, Kobayashi S, Shirakawa Y, Ishizue N, Oikawa J, Kishihara J, Niwano S, Ako J. Catheter contact angle influences local impedance drop during radiofrequency catheter ablation: insight from a porcine experimental study. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0362] [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
Local impedance (LI) at a distal tip of the ablation catheter can indirectly measure catheter contact and tissue temperature during radiofrequency catheter ablation (RFCA). LI decreases by RFCA, and a degree of LI drop is correlated with lesion size. However, data on the effects of catheter contact angle on lesion size and LI drop were scarce. This study aimed to evaluate the influence of catheter contact angle on lesion size and LI drop in a porcine experimental study.
Methods
Lesions were created on porcine myocardial left ventricles by the LI-sensing ablation catheter (IntellaNav MiFi OI®). Contact force (CF) was measured using pressure to current transducer (load cell). Radiofrequency ablation was performed with a power of 30 Watt and a duration of 30 seconds. CF (0g, 5g, 10g, 20g, and 30g) and catheter angle (30°, 45°, and 90°) were changed in each set (total 120 lesions, n=8 each). LI rise, LI drop by RF application, and lesion size (maximum lesion width, maximum surface width, and maximum lesion depth) were evaluated.
Results
There was no angular dependence in LI rise in all CF. The values of LI rise increased as CF increased. The LI drop also increased as CF increased in all contact angles. Regarding the difference of catheter angles, LI drop with 90° was lower than those with 30° and 45°in CF 10g, 20g, and 30g, respectively. Maximum lesion width and surface width were larger in 30° and 45° than those in 90°, whereas there were no differences in maximum lesion depth.
Conclusion
LI drop in 90° were significantly lower than those in 45° and 30°. Although lesion depths were not different among the three angles, the absolute values of LI drop were different. Caution should be exercised to comprehend the LI drop with catheter angles.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- G Matsuura
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - E Ogawa
- Kitasato University School of Allied Health Sciences, Medical Engineering and Technology, Sagamihara, Japan
| | - S Kawakami
- Kitasato University School of Allied Health Sciences, Medical Engineering and Technology, Sagamihara, Japan
| | - D Saito
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - T Sato
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - S Kobayashi
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - Y Shirakawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - N Ishizue
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
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6
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Nishinarita R, Niwano S, Ishizue N, Satoh T, Matsuura G, Arakawa Y, Kobayashi S, Shirakawa Y, Horiguchi A, Nakamura H, Oikawa J, Kishihara J, Fukaya H, Niwano H, Ako J. Novel risk factor for fatal arrhythmia in Brugada syndrome. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0735] [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
Brugada syndrome (BrS) is a genetic disease associated with increased risk of ventricular fibrillation (VF)/ventricular tachycardia (VT). The VF/VT in BrS occurs more frequently during a night time or at a rest with parasympathetic nerve activation. Some risk factors of VF/VT occurrence in BrS have been elucidated, however, it remains controversial about risk stratification. Salusin-β is an endogenous bioactive peptide that systemically exerts rapid and profound hypotensive and bradycardic activities and parasympathomimetic hemodynamic actions in vivo. Previous reports suggested that salusin-β is suppressed following physiological parasympathetic stimulation and appears to constitute a negative feedback relationship with the parasympathetic nervous system.
Purpose
We hypothesized that salusin-β is associated with the occurrence of VF/VT in BrS.
Methods
The study population consisted of 26 BrS patients with newly implantation of implantable cardioverter defibrillator (ICD) during 2003–2008. In all patients, salusin-β was measured in supine position after 20 minute rest. The date of salusin-β sampling was set as the registration point for this study. The VF/VT was defined as any episode of fatal ventricular tachyarrhythmia or any appropriate shock. In accordance with the presence or absence of VF/VT events within 5 years, all patients were divided into VF/VT group (n=6) and non-VF/VT group (n=20).Various clinical parameters were compared between the two groups. For analysis of autonomic nervous function, heart rate variability (HRV) and pupil function were evaluated.
Results
The mean age was 54±17 years old. There is no differences between the two groups in clinical parameters. In analysis of HRV, the high-frequency component (0.15–0.40 Hz; HF), low frequency component (0.04–0.15 Hz; LF) and the LF/HF ratio were analyzed over 24 h. LF/HF ratio was significantly lower over 24h in VF/VT groups in comparison with non-VF/VT groups [day-time; 1.8 (1.2–5.6) vs. 5.2 (3.4–8.8), p=0.048, night-time; 1.2 (1.1–1.3) vs. 3.9 (2.5–8.7), p=0.003]. Furthermore, in analysis of pupil function, right/left miosis ratio was higher in VT/VF groups in comparison with non-VT/VF groups [right pupil; 0.39 (0.37–0.59) vs. 0.34 (0.28–0.38), p=0.035, left pupil; 0.43 (0.36–0.50) vs. 0.33 (0.28–0.40), p=0.049]. In plasma total salusin-β levels, the VF/VT groups exhibited significantly lower than non-VF/VT groups (55.2±14.6 vs. 73.2±22.2, p=0.039, Figure).
Conclusions
Salusin-β was associated with the occurrence of VF/VT in Brugada syndrome. Salusin-β might be useful to identify high-risk patients for the occurrence of VT/VF events in Brugada syndrome.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- R Nishinarita
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - N Ishizue
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - T Satoh
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - G Matsuura
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Kobayashi
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Shirakawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Niwano
- Tamagawa University, Department of Education, Machida, Japan
| | - J Ako
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
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7
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Shirakawa Y, Niwano S, Oikawa J, Saito D, Sato T, Matsuura G, Arakawa Y, Kobayashi S, Nishinarita R, Horiguchi A, Ishizue N, Kishihara J, Fukaya H, Ako J. Remote monitoring can predict lethal arrhythmic events through time-domain analysis of heart rate variability in patients with implantable cardioverter defibrillator. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0815] [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
We prospectively collected device and heart rate data, i.e. heart rate variability (HRV), through remote monitoring (RM) of patients with implantable cardioverter defibrillator (ICD). Several studies have demonstrated usefulness of RM in implanted device patients, however, reports concerning the predictors of lethal ventricular arrhythmias are limited.
Purpose
The objective was to identify the predictors of lethal arrhythmic events (VT/VF).
Methods
Thirty-three patients (mean age: 50 years) with ICDs [with functionality of HRV analysis] were divided into 2 groups [VT/VF(+), VT/VF(−)]. Clinical, device (ventricular lead impedance; amplitude of ventricular electrogram), and HRV data were compared between the 2 groups. As the index of time-domain HRV analysis, NN intervals-index (SDNNi) was calculated for every 5 minutes, and the mean, maximum, and minimum SDNNi during the 24-hour period were used.
Results
During the observation period (median 12 months), 10 patients experienced VT/VF events. In HRV data, the mean, max, and min SDNNi were higher in VT/VF(+) than VT/VF(−) group (132.9±9.3 v.s. 93.5±6.1, p=0.0013; 214.6±10.6 v.s. 167.0±7.0, p=0.0007; 71.2±7.5 v.s. 43.9±4.9, p=0.0047). The other parameters did not exhibit significant difference. On logistic regression analysis, the mean SDNNi of 100.1, max SDNNi of 185.0 and min SDNNi of 52.0 as cut-off values for prediction of VT/VF event demonstrated significant receiver operating characteristics (ROC) curves (AUC=0.86, p=0.0007; AUC=0.84, p=0.0005; AUC=0.78, p=0.0030). Furthermore, in cases of VT/VF(+) group, the max ΔSDNNi, i.e., difference from baseline SDNNi, and min ΔSDNNi in 7 and 28 days preceding VT/VF events exhibited time course changes in comparison with baseline values. They were significant predictors of VT/VF events (max ΔSDNNi cut-off: 46.8, AUC=0.91, p=0.0002; min ΔSDNNi cut-off: −42.4, AUC=0.88, p=0.0014).
Conclusion
Time-domain analysis of HRV through RM may help identify patients at high risk of lethal arrhythmic events, and predict occurrence of such arrhythmic events.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Shirakawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - D Saito
- Kitasato University School of Medicine, Sagamihara, Japan
| | - T Sato
- Kitasato University School of Medicine, Sagamihara, Japan
| | - G Matsuura
- Kitasato University School of Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - S Kobayashi
- Kitasato University School of Medicine, Sagamihara, Japan
| | - R Nishinarita
- Kitasato University School of Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Sagamihara, Japan
| | - N Ishizue
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Sagamihara, Japan
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8
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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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9
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Arakawa Y, Fukaya H, Kakizaki R, Oikawa J, Matsuura G, Kobayashi S, Shirakawa Y, Nishinarita R, Horiguchi A, Ishizue N, Nabeta T, Igarashi G, Kishihara J, Niwano S, Ako J. P1495Energy loss by right ventricular pacing: normal left ventricular function vs. hypertrophic cardiomyopathy. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0259] [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
Right ventricular (RV) pacing causes left ventricular (LV) dysfunction. On the other hand, RV pacing for hypertrophic obstructive cardiomyopathy (HOCM) is an established treatment. LV flow energy loss (EL) is a new hemodynamic index for assessing cardiac function. However, the impact of RV pacing on EL remains unknown.
Objective
The objective of this study was to investigate the EL by RV pacing on normal LV function and hypertrophic cardiomyopathy (HCM).
Methods
A total of 28 patients underwent echocardiography for EL assessment under AAI (without RV pacing) and DDD (with all RV pacing) mode. Among them, 16 were sick sinus syndrome (SSS) patients with normal LV function, and 12 were HCM patients. EL was calculated from color Doppler images using a vector flow mapping.
Results
There were no significant difference in patients' background parameters between the SSS and the HCM groups. In the SSS group, mean systolic EL was significantly increased from AAI to DDD mode (14.9 to 19.2 mW/m, P<0.01, Panel A), whereas diastolic EL was not changed from AAI to DDD mode (22.3 to 18.8 mW/m, P=0.12). In the HCM group, systolic mean EL was significantly decreased from AAI to DDD mode (29.9 to 22.5 mW/m, P<0.01, Panel B) irrespectively of with or without LV outflow obstruction, whereas diastolic mean EL was not changed from AAI to DDD mode (28.6 to 24.3 mW/m, P=0.47).
Change of flow energy loss
Conclusion
RV pacing increased mean systolic EL in normal LV function, but decreased in HCM with or without LV outflow obstruction. In the patients with HCM, the impact of RV pacing on EL is different compared with normal LV function.
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Affiliation(s)
- Y Arakawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Sagamihara, Japan
| | - R Kakizaki
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - G Matsuura
- Kitasato University School of Medicine, Sagamihara, Japan
| | - S Kobayashi
- Kitasato University School of Medicine, Sagamihara, Japan
| | - Y Shirakawa
- Kitasato University School of Medicine, Sagamihara, Japan
| | - R Nishinarita
- Kitasato University School of Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Sagamihara, Japan
| | - N Ishizue
- Kitasato University School of Medicine, Sagamihara, Japan
| | - T Nabeta
- Kitasato University School of Medicine, Sagamihara, Japan
| | - G Igarashi
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Sagamihara, Japan
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10
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Nishinarita R, Niwano S, Niwano H, Nakamura H, Arakawa Y, Horiguchi A, Oikawa J, Kishihara J, Sato A, Fukaya H, Ako J. P2295SGLT 2 inhibitor suppresses atrial fibrillation in the canine model of atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2295] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- R Nishinarita
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - H Niwano
- Tamagawa University, Dept. of Education, Machida, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - A Sato
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Dept. of Cardiovascular Medicine, Sagamihara, Japan
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11
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Oikawa J, Fukaya H, Nabeta T, Arakawa Y, Horiguchi A, Nishinarita R, Nakamura H, Satoh A, Kishihara J, Ishii S, Noda C, Yamaoka-Tojo M, Niwano S, Ako J. P966Daily heart rate variability predicts heart failure events in patients with permanent atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p966] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- J Oikawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - T Nabeta
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - R Nishinarita
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - A Satoh
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - S Ishii
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - C Noda
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - M Yamaoka-Tojo
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
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12
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Fukaya H, Kishihara J, Oikawa J, Arakawa Y, Nishinarita R, Horiguchi A, Nakamura H, Satoh A, Niwano S, Ako J. P1934Fibrillation cycle length predicts recurrence after catheter ablation in patients with persistent atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1934] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Fukaya
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - R Nishinarita
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - A Satoh
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Cardiovascular Medicine, Sagamihara, Japan
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13
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Nabeta T, Oikawa J, Nakamura H, Ishii S, Naruke T, Ryo-Koriyama K, Yamaoka-Tojo M, Noda C, Ako J. P1284Biatrial remodeling is associated with cardiovascular events in patients with atrial fibrillation and preserved ejection fraction. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1284] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T Nabeta
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Ishii
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - T Naruke
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - K Ryo-Koriyama
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - M Yamaoka-Tojo
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - C Noda
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
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14
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Nishinarita R, Niwano S, Fukaya H, Oikawa J, Nabeta T, Arakawa Y, Horiguchi A, Nakamura H, Kishihara J, Sato A, Niwano H, Ako J. P5776Burden of device-detected atrial high-rate episode is associated with heart failure events. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5776] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- R Nishinarita
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - T Nabeta
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - Y Arakawa
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - A Horiguchi
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - A Sato
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Niwano
- Tamagawa University, Department of Education, Machida, Japan
| | - J Ako
- Kitasato University School of Medicine, Department of Cardiovascular Medicine, Sagamihara, Japan
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15
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Matsuya Y, McMahon SJ, Tsutsumi K, Sasaki K, Okuyama G, Yoshii Y, Mori R, Oikawa J, Prise KM, Date H. Investigation of dose-rate effects and cell-cycle distribution under protracted exposure to ionizing radiation for various dose-rates. Sci Rep 2018; 8:8287. [PMID: 29844494 PMCID: PMC5974424 DOI: 10.1038/s41598-018-26556-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 05/04/2018] [Indexed: 01/04/2023] Open
Abstract
During exposure to ionizing radiation, sub-lethal damage repair (SLDR) competes with DNA damage induction in cultured cells. By virtue of SLDR, cell survival increases with decrease of dose-rate, so-called dose-rate effects (DREs). Here, we focused on a wide dose-rate range and investigated the change of cell-cycle distribution during X-ray protracted exposure and dose-response curves via hybrid analysis with a combination of in vitro experiments and mathematical modelling. In the course of flow-cytometric cell-cycle analysis and clonogenic assays, we found the following responses in CHO-K1 cells: (1) The fraction of cells in S phase gradually increases during 6 h exposure at 3.0 Gy/h, which leads to radio-resistance. (2) Slight cell accumulation in S and G2/M phases is observed after exposure at 6.0 Gy/h for more than 10 hours. This suggests that an increase of SLDR rate for cells in S phase during irradiation may be a reproducible factor to describe changes in the dose-response curve at dose-rates of 3.0 and 6.0 Gy/h. By re-evaluating cell survival for various dose-rates of 0.186-60.0 Gy/h considering experimental-based DNA content and SLDR, it is suggested that the change of S phase fraction during irradiation modulates the dose-response curve and is possibly responsible for some inverse DREs.
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Affiliation(s)
- Yusuke Matsuya
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Stephen J McMahon
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Kaori Tsutsumi
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kohei Sasaki
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Go Okuyama
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Yuji Yoshii
- Biological Research, Education and Instrumentation Center, Sapporo Medical University, Sapporo, 060-8556, Japan
| | - Ryosuke Mori
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Joma Oikawa
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kevin M Prise
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan.
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16
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Matsuya Y, McMahon SJ, Tsutsumi K, Sasaki K, Okuyama G, Yoshii Y, Mori R, Oikawa J, Prise KM, Date H. Investigation of dose-rate effects and cell-cycle distribution under protracted exposure to ionizing radiation for various dose-rates. Sci Rep 2018. [PMID: 29844494 DOI: 10.1038/s41598a018-26556a5] [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: 05/06/2023] Open
Abstract
During exposure to ionizing radiation, sub-lethal damage repair (SLDR) competes with DNA damage induction in cultured cells. By virtue of SLDR, cell survival increases with decrease of dose-rate, so-called dose-rate effects (DREs). Here, we focused on a wide dose-rate range and investigated the change of cell-cycle distribution during X-ray protracted exposure and dose-response curves via hybrid analysis with a combination of in vitro experiments and mathematical modelling. In the course of flow-cytometric cell-cycle analysis and clonogenic assays, we found the following responses in CHO-K1 cells: (1) The fraction of cells in S phase gradually increases during 6 h exposure at 3.0 Gy/h, which leads to radio-resistance. (2) Slight cell accumulation in S and G2/M phases is observed after exposure at 6.0 Gy/h for more than 10 hours. This suggests that an increase of SLDR rate for cells in S phase during irradiation may be a reproducible factor to describe changes in the dose-response curve at dose-rates of 3.0 and 6.0 Gy/h. By re-evaluating cell survival for various dose-rates of 0.186-60.0 Gy/h considering experimental-based DNA content and SLDR, it is suggested that the change of S phase fraction during irradiation modulates the dose-response curve and is possibly responsible for some inverse DREs.
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Affiliation(s)
- Yusuke Matsuya
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Stephen J McMahon
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Kaori Tsutsumi
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kohei Sasaki
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Go Okuyama
- Faculty of Health Sciences, Hokkaido University of Science, Sapporo, 006-8585, Japan
| | - Yuji Yoshii
- Biological Research, Education and Instrumentation Center, Sapporo Medical University, Sapporo, 060-8556, Japan
| | - Ryosuke Mori
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Joma Oikawa
- Graduate School of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Kevin M Prise
- Centre for Cancer Research & Cell Biology, Queen's University Belfast, Belfast, BT9 7AE, UK
| | - Hiroyuki Date
- Faculty of Health Sciences, Hokkaido University, Sapporo, 060-0812, Japan.
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17
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Ishizue N, Niwano S, Fukaya H, Nakamura H, Oikawa J, Kishihara J, Satoh A, Ako J. 224Day-to-day Variation of J-wave Predicts Life-Threatening Arrhythmias in Patients with Brugada syndrome. Europace 2018. [DOI: 10.1093/europace/euy015.073] [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: 11/13/2022] Open
Affiliation(s)
- N Ishizue
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - S Niwano
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Fukaya
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - H Nakamura
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Oikawa
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Kishihara
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - A Satoh
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
| | - J Ako
- Kitasato University, Department of Cardiovascular Medicine, Sagamihara, Japan
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18
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Oikawa J, Niwano S, Fukaya H, Horiguchi A, Nishinarita R, Muramatsu Y, Nakamura H, Satoh A, Kishihara J, Mizutani T, Takeuchi I, Asari Y, Ako J. P2759A novel scoring system for neurological outcomes in patients receiving thrapeutic hypothermia cardiopulmonary arrest. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2759] [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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19
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Zhao W, Ukawa S, Tsushita K, Kawamura T, Wakai K, Ando M, Okabayashi S, Matsushita M, Oikawa J, Kojima R, Tamakoshi A. The Impact of Gait Speed on Mortality among Japanese Elderly in a New Integrated Suburban Seniority Investigation Project: A Prospective Cohort Study. Int J Epidemiol 2015. [DOI: 10.1093/ije/dyv097.085] [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: 11/13/2022] Open
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20
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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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21
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Méndez M, Barbosa-Luna IG, Pérez-Luna JM, Cupo A, Oikawa J. Effects of acute ethanol administration on methionine-enkephalin expression and release in regions of the rat brain. Neuropeptides 2010; 44:413-20. [PMID: 20605629 DOI: 10.1016/j.npep.2010.05.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [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: 12/11/2009] [Revised: 04/15/2010] [Accepted: 05/08/2010] [Indexed: 10/19/2022]
Abstract
The dopaminergic mesolimbic system plays a key role in mediating the reinforcing properties of ethanol and other drugs of abuse. Ethanol reinforcement and high alcohol drinking behaviour have been suggested to involve the ethanol-induced activation of endogenous opioid systems. Ethanol may alter opioidergic transmission at different levels, including opioid peptide biosynthesis and release, as well as binding to opioid receptors. The aim of this work was to investigate the effects of different ethanol doses on methionine-enkephalin (Met-enk) release from the rat nucleus accumbens (NAcc). Ethanol effects were also studied on Met-enk content in the NAcc, prefrontal cortex (PFC) and caudate-putamen (CP). Met-enk release was studied by microdialysis in Wistar anesthetized rats and peptide concentrations were quantitated by radioimmunoassay. Ethanol was administered by intraperitoneal injection after a 2-h basal release period. Ethanol doses of 0.5, 1 and 2.5 g/kg induced a 2.7-, 4.9- and 3.4-fold increase in Met-enk release from the NAcc. However, ethanol responses followed different kinetics, with earliest effects observed with the highest ethanol dose. In comparison, a 2.5-fold increase in peptide release was produced by 100 mM KCl. Ethanol, at a dose of 2.5 g/kg, induced a significant 66.7% decrease in Met-enk content in the NAcc, as well as a 76.4% reduction in peptide levels in the CP. Lower ethanol doses did not alter Met-enk content in these regions. On the other hand, an ethanol dose of 0.5 g/kg produced a non-significant decrease in Met-enk levels in the PFC. Our results suggest that ethanol-induced changes in enkephalin expression and release in regions of the mesocorticolimbic and nigrostriatal pathways could be involved in ethanol central effects. Released enkephalins by ethanol may modulate the dopaminergic activity of mesolimbic neurons and play a critical role in ethanol reinforcement mechanisms.
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Affiliation(s)
- M Méndez
- Departamento de Neuroquímica, Subdirección de Investigaciones Clínicas, Instituto Nacional de Psiquiatría Ramón de la Fuente, Calzada México Xochimilco 101, Col. San Lorenzo Huipulco, 14370 México D.F., Mexico.
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22
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Kumagai H, Ohminato T, Nakano M, Ooi M, Kubo A, Inoue H, Oikawa J. Very-long-period seismic signals and caldera formation at Miyake Island, Japan. Science 2001; 293:687-90. [PMID: 11474109 DOI: 10.1126/science.1062136] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Over a period of roughly 40 days, starting on 8 July 2000, a caldera structure 1.7 kilometers in diameter developed by means of gradual depression and expansion of the summit crater at Miyake Island, Japan. At the same time, very-long-period (VLP) seismic signals were observed once or twice a day. Source mechanism analyses of the VLP signals show that the moment tensor solutions are smooth step functions over a time scale of 50 seconds, with dominant volumetric change components. We developed a model to explain the caldera and the VLP signals, in which a vertical piston of solid materials in the conduit is intermittently sucked into the magma chamber by lateral magma outflow. This model offers potential for making quantitative estimations of the characteristic physical properties of magma systems.
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Affiliation(s)
- H Kumagai
- National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan
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23
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Kaneshima S, Kawakatsu H, Matsubayashi H, Sudo Y, Tsutsui T, Ohminato T, Ito H, Uhira K, Yamasato H, Oikawa J, Takeo M, Iidaka T. Mechanism of Phreatic Eruptions at Aso Volcano Inferred from Near-Field Broadband Seismic Observations. Science 1996. [DOI: 10.1126/science.273.5275.643] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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24
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Kaneshima S, Kawakatsu H, Matsubayashi H, Sudo Y, Tsutsui T, Ohminato T, Ito H, Uhira K, Yamasato H, Oikawa J, Takeo M, Iidaka T. Mechanism of Phreatic Eruptions at Aso Volcano Inferred from Near-Field Broadband Seismic Observations. Science 1996; 273:642-5. [PMID: 8662554 DOI: 10.1126/science.273.5275.642] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Broadband seismometers deployed at Aso volcano in Japan have detected a hydrothermal reservoir 1 to 1.5 kilometers beneath the crater that is continually resonating with periods as long as 15 seconds. When phreatic eruptions are observed, broadband seismograms elucidate a dynamic interplay between the reservoir and discharging flow along the conduit: gradual pressurization and long-period (approximately20 seconds) pulsations of the reservoir during the 100 to 200 seconds before the initiation of the discharge, followed by gradual deflation of the reservoir concurrent with the discharging flow. The hydrothermal reservoir, where water and heat from the deeper magma chamber probably interact, appears to help control the surface activity at Aso volcano.
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Affiliation(s)
- S Kaneshima
- S. Kaneshima, Department of Earth and Planetary Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan. H. Kawakatsu, H. Matsubayashi, J. Oikawa, M. Takeo, T. Iidaka, Earthquake Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113 Japan. Y. Sudo and T. Tsutsui, Aso Volcanological Laboratory, Faculty of Science, Kyoto University, Aso, Kumamoto 869-14, Japan. T. Ohminato and H. Ito, Geological Survey of Japan, Tsukuba, Ibaraki 305, Japan. K. Uhira, Japan Meteorological Agency, Chiyoda-ku, Tokyo 110, Japan. H. Yamasato, Meteorological Research Institute, Tsukuba, Ibaraki 305, Japan
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Kasai H, Nakayama M, Toda N, Yamaizumi Z, Oikawa J, Nishimura S. Methylreductic acid and hydroxymethylreductic acid: oxygen radical-forming agents in heated starch. Mutat Res 1989; 214:159-64. [PMID: 2671697 DOI: 10.1016/0027-5107(89)90210-8] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Two compounds forming oxygen radicals were isolated from heated starch by monitoring the potency to form 8-hydroxydeoxyguanosine from deoxyguanosine during purification procedures. These compounds were identified as hydroxymethylreductic acid and methylreductic acid. The former compound was mutagenic to Salmonella strains TA100, TA102 and TA104 and the latter compound induced sister-chromatid exchanges in human NL3 cells. Hydroxymethylreductic acid was found to be a novel compound. Considerable amounts of these compounds were detected in various heat-processed foods.
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Affiliation(s)
- H Kasai
- Biology Division, National Cancer Center Research Institute, Tokyo, Japan
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Kondo A, Niitsu Y, Oikawa J, Watanabe N, Fukuda M, Urushizaki I. [A case of B-cell malignant lymphoma associated with high serum titer of cold haemagglutinin (IgG-IgM mixed type) (author's transl)]. Rinsho Ketsueki 1980; 21:46-51. [PMID: 6966339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Tamura M, Yoshida N, Oikawa J, Sato S, Ishitani K. [A case of hypereosinophilic syndrome (author's transl)]. Rinsho Ketsueki 1977; 18:169-76. [PMID: 558361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Konno S, Kumagai S, Oikawa J. [Determination of urinary glutamyl transpeptidase - (3). Evaluation of the results of kidney function tests]. Rinsho Byori 1974; 22:86. [PMID: 4155780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Yoshida E, Nakamura K, Oikawa J, Kaneda F, Ishii T. [Detection of Australia antigen]. Rinsho Byori 1971; 19:Suppl:459. [PMID: 5168136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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