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Yokoi M, Ito T, Kawada Y, Yamamoto J, Yamada T, Kikuchi S, Kitada S, Goto T, Hattori H, Suda H, Seo Y. A Case of Myocardial Infarction with Non-obstructive Coronary Arteries Complicated by a Ventricular Septal Rupture: The Challenge of Achieving Hemodynamic Stability Using Impella Devices. Intern Med 2024:2945-23. [PMID: 38599873 DOI: 10.2169/internalmedicine.2945-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/12/2024] Open
Abstract
The prognosis of myocardial infarction with non-obstructive coronary arteries (MINOCA) is reported to be as worse as myocardial infarction with obstructive coronary arteries. However, its mechanical complications are still poorly understood. A 71-year-old woman developed MINOCA after ascending aortic replacement surgery. During treatment, the patient experienced cardiogenic shock due to a ventricular septal rupture (VSR). The introduction of Impella devices reduced the left-to-right shunt and improved the patient's hemodynamics. Finally, a scheduled surgical repair was performed under stable conditions. In this report, we focused on the pathophysiology of MINOCA-related VSR and discussed the effectiveness of Impella devices as a bridge to surgical repair and circulatory backup during the perioperative period.
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Affiliation(s)
- Masashi Yokoi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Tsuyoshi Ito
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Junki Yamamoto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Toshiyuki Yamada
- Department of Cardiovascular Surgery, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Toshihiko Goto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Hideo Hattori
- Department of Pathology and Molecular Diagnostics, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Hisao Suda
- Department of Cardiovascular Surgery, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Japan
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Kikuchi S, Kayama K, Kawada Y, Kitada S, Seo Y. Evaluation of renal circulation in heart failure using superb microvascular imaging, a microvascular flow imaging system. J Med Ultrason (2001) 2024:10.1007/s10396-023-01397-6. [PMID: 38236503 DOI: 10.1007/s10396-023-01397-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 11/15/2023] [Indexed: 01/19/2024]
Abstract
PURPOSE Renal circulation evaluation is essential in understanding the cardiorenal relationship in heart failure (HF), and there is a growing interest in imaging techniques that visualize renal circulation. This study aimed to assess the effectiveness of superb microvascular imaging (SMI) in evaluating renal circulation in HF patients. METHOD The study included 71 HF patients undergoing cardiac catheterization. Prior to catheterization, renal ultrasound examinations were performed. A control group of 18 subjects without HF was also included. SMI was used to measure the vascular index (VI), which was calculated as the percentage of blood flow signal area in the region of interest. The intrarenal perfusion index (IRPI) was determined as a fluctuation index of VI, reflecting variations in the number of blood cells moving through renal tissue during the cardiac cycle. RESULTS Using the upper 95% confidence interval of IRPI (0.6) from the control group, HF patients were classified into two groups. Patients with IRPI > 0.6 showed a more congestive profile. Right atrial pressure and biphasic or monophasic Doppler intrarenal flow pattern were independent determinants of IRPI > 0.6. In addition, IRPI remained a significant predictor of estimated glomerular filtration rate (eGFR). CONCLUSION The parameter IRPI as variations in SMI signal during the cardiac cycle may be a useful evaluation method for renal perfusion impairment in HF.
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Affiliation(s)
- Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Kiyomi Kayama
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan.
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Yokoi M, Ito T, Kawada Y, Mizoguchi T, Yamamoto J, Mori K, Nakasuka K, Kikuchi S, Fujita H, Kitada S, Goto T, Seo Y. Malondialdehyde-Modified Low-Density Lipoprotein as a Predictor of Major Adverse Limb Events after Endovascular Therapy in Patients with Lower Extremity Arterial Disease. J Atheroscler Thromb 2023; 30:1612-1621. [PMID: 36889737 PMCID: PMC10627766 DOI: 10.5551/jat.64091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 02/05/2023] [Indexed: 03/10/2023] Open
Abstract
AIM Adverse limb events after endovascular therapy (EVT) are a major concern. This study aimed to investigate the relationship between serum malondialdehyde-modified low-density lipoprotein (MDA-LDL) level, a potentially potent indicator of atherosclerosis, and clinical outcomes after EVT in patients with lower extremity arterial disease (LEAD). METHODS A total of 208 LEAD patients who underwent EVT and MDA-LDL measurements were retrospectively analyzed. Those with chronic limb-threatening ischemia (CLTI) were included in the CLTI subgroup (n=106). Patients were further categorized into the High or Low MDA-LDL groups according to the cut-off value calculated by receiver operating characteristic analysis. Major adverse limb events (MALE), a composite of cardiovascular death, limb-related death, major amputation, and target-limb revascularization, were evaluated. RESULTS MALE occurred in 73 (35%) patients. The median follow-up interval was 17.4 months. The MDA-LDL cut-off values were 100.5 U/L (area under the curve [AUC] 0.651) in the overall population and 98.0 U/L (AUC 0.724) in the CLTI subgroup. Overall, the High MDA-LDL group showed significantly higher total cholesterol (189.7±37.5 mg/dL vs. 159.3±32.0 mg/dL, p<0.01), low-density lipoprotein cholesterol (114.3±29.7 mg/dL vs. 87.3±25.3 mg/dL, p<0.01), and triglyceride (166.9±91.1 mg/dL vs. 115.8±52.3 mg/dL, p<0.01) than the Low MDA-LDL group. Multivariate Cox regression analyses revealed that MDA-LDL and C-reactive protein were independent predictors of MALE. In the CLTI subgroup, MDA-LDL was an independent predictor of MALE. The High MDA-LDL group showed worse MALE-free survival rates than the Low MDA-LDL group in overall (p<0.01) and in the CLTI subgroup (p=0.01). CONCLUSIONS Serum MDA-LDL level was associated with MALE after EVT.
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Affiliation(s)
- Masashi Yokoi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Tsuyoshi Ito
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Tatsuya Mizoguchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Junki Yamamoto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Kento Mori
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Kosuke Nakasuka
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hiroshi Fujita
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Toshihiko Goto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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Mizoguchi T, Sugiura T, Kawada Y, Yamamoto J, Yokoi M, Nakasuka K, Mori K, Kikuchi S, Ito T, Kitada S, Goto T, Seo Y. Association Between Aortic Stiffness and Exercise Tolerance in Patients at the Risk Stage of Heart Failure. Circ J 2023. [PMID: 36948631 DOI: 10.1253/circj.cj-22-0772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
BACKGROUND The number of patients with heart failure (HF) has increased, and it is crucial to prevent the development of HF in patients at risk of HF. The present study aimed to risk stratify patients in Stage A and B HF based on associations between exercise-induced changes in aortic stiffness and exercise tolerance.Methods and Results: Patients in Stage A and B HF who performed a cardiopulmonary exercise test were enrolled in the study (n=106; median age 65.0 years [interquartile range 52.8-73.0 years]). Exercise tolerance was examined by the percentage of predicted peak oxygen consumption (%V̇O2peak). The ascending aortic pressure waveform was estimated non-invasively. Aortic stiffness was assessed using the augmentation index (AIx) and reflection magnitude (RM). Multivariable regression analysis showed that AIx measured both before and after exercise was significantly associated with %V̇O2peak (β=-0.221 [P=0.049] and β=-0.342 [P=0.003], respectively). When participants were divided into %V̇O2peak subgroups using a cut-off value of 60%, RM decreased immediately after exercise and remained lower 5 min after exercise in the group with preserved exercise tolerance, but recovered to baseline levels 5 min after exercise in the group with reduced exercise tolerance. CONCLUSIONS Exercise-induced increases in aortic stiffness were associated with exercise tolerance in patients at risk of HF, suggesting that exercise-induced changes in aortic stiffness may be useful to stratify high-risk patients.
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Affiliation(s)
- Tatsuya Mizoguchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Tomonori Sugiura
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Junki Yamamoto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Masashi Yokoi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Kosuke Nakasuka
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Kento Mori
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Tsuyoshi Ito
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Toshihiko Goto
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences
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Kawada Y, Kitada S, Hachiya K, Kato M, Nakasuka K, Kikuchi S, Seo Y, Ohte N. Left Ventricular Hypertrophic Change Indicating Poor Prognosis in Patients With Normal-Flow, Low-Gradient Severe Aortic Stenosis With Preserved Left Ventricular Ejection Fraction. Circ Rep 2021; 3:345-353. [PMID: 34136710 PMCID: PMC8180370 DOI: 10.1253/circrep.cr-21-0011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Background:
Risk stratification of normal-flow, low-gradient (NFLG) severe aortic stenosis (SAS) with preserved left ventricular (LV) ejection fraction (EF) remains unclear. Methods and Results:
Of 289 consecutive patients diagnosed with SAS by aortic valve area <1.0 cm2, 66 with NFLG-SAS (stroke volume index >35 mL/m2, mean pressure gradient <40 mmHg, LVEF ≥50%) were enrolled in this study; patients with bicuspid aortic valve, acute coronary syndrome, hemodialysis, or a history of aortic valve replacement (AVR) were excluded. Adverse events (AEs) were defined as cardiovascular death, hospitalization for heart failure, and deteriorating condition requiring AVR. Factors associated with AEs were investigated using a Cox proportional hazards model. Over a median of 675 days of follow-up, 25 AEs were recorded: 4 cardiovascular deaths, 12 hospitalizations for heart failure, and 9 patients requiring AVR. In addition, there were 14 events of progression to high-gradient SAS. Multivariable analysis showed significant associations between AEs and the presence of symptoms (hazard ratio [HR] 10.276; 95% confidence interval [CI] 3.724–28.357; P<0.001), LV hypertrophy (LV mass index >115 and >95 mg/m2
for males and females, respectively; HR 3.257; 95% CI 1.172–9.050; P=0.024), and tricuspid regurgitation (TR) velocity (HR 2.761; 95% CI 1.246–6.118; P=0.012). Conclusions:
The presence of symptoms, LV hypertrophy, and high TR velocity could be reliable prognostic indicators and may require watchful waiting for timely AVR in patients with NFLG-SAS.
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Affiliation(s)
- Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Kenta Hachiya
- Division of Cardiology, Nagoya City University East Medical Center Nagoya Japan
| | - Marina Kato
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Kosuke Nakasuka
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Nobuyuki Ohte
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences Nagoya Japan
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Nakasuka K, Kitada S, Kawada Y, Kato M, Kikuchi S, Seo Y, Ohte N. Future bradyarrhythmia in patients with hypertrophic cardiomyopathy. Int J Cardiol Heart Vasc 2021; 33:100735. [PMID: 33718587 PMCID: PMC7933266 DOI: 10.1016/j.ijcha.2021.100735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 02/03/2021] [Indexed: 10/26/2022]
Abstract
Background A few studies to evaluate an incidence of bradyarrhythmia in patients with hypertrophic cardiomyopathy (HCM) have been reported. Methods We enrolled 161 patients with HCM to evaluate their bradyarrhythmia risk, especially the risk of patients who were at risk for sudden cardiac death (SCD) and eligible for implantation of an implantable cardiac defibrillator (ICD). We defined symptomatic bradyarrhythmia requiring a pacing therapy as a bradyarrhythmia event and collected the data on an occurrence of the event after the time of diagnosis of HCM. The incidence of bradyarrhythmia events was compared between patients with ICD indications (ICD-candidate group) and those without (non-ICD-candidate group). Furthermore, we investigated the associated factors with bradyarrhythmia events using a Cox proportional-hazards model. Results During 5.5 ± 4.4 years follow-up, bradyarrhythmia events occurred in 8% (13 patients) of whole patients, and in 15% of the ICD-candidate group (n = 74). In contrast, only 2 events (2%) occurred in the non-ICD-candidate group. The incidence of bradyarrhythmia in the ICD-candidate group was significantly higher than that in the non-ICD-candidate group (log-rank p = 0.015). In the ICD-candidate group, a Cox proportional-hazards model demonstrated that lower heart rate at the time of diagnosis (HR: 1.072, 95%CI: 1.012 to 1.135, p = 0.018), and an eligibility of ICD implantation for secondary prevention of SCD (HR: 9.092, 95%CI: 2.644 to 31.258, p < 0.001) were significantly associated with future bradyarrhythmia. Conclusions HCM patients with eligibility for ICD implantation, especially for secondary prevention of SCD, more frequently suffered from bradyarrhythmia events.
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Affiliation(s)
- Kosuke Nakasuka
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shuichi Kitada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yu Kawada
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Marina Kato
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Nobuyuki Ohte
- Department of Cardiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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Hosoda H, Kawada Y, Tatsutomi Y, Imai S. [Gastric Conduit Ulcer Pentration into the Right Middle Lobe after Esophageal Cancer Surgery;Report of a Case]. Kyobu Geka 2020; 73:557-559. [PMID: 32641678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A 55-year-old man with esophageal cancer underwent esophagectomy along with lymph node dissection and reconstruction with gastric conduit through the sternal route. He developed a continuous cough with sputum production, 3 years postoperatively. Chest radiography revealed a right middle lung field infiltrate. Chest computed tomography revealed communication between the reconstructed esophagus and the gastric conduit( pull-up) and right middle lobe airways. Upper gastrointestinal examination revealed ulcerative lesions involving the gastric mucosa;however, biopsy of the ulcer showed no malignancy. Conservative therapy including fasting and proton-pump inhibitor administration did not improve symptoms caused by gastropleural fistula. Thoracotomy was performed through the anterolateral intercostal space under the right-up supine position, and the partial lung resection and direct closure of the stomach with muscle flap wrapping was performed.
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Affiliation(s)
- Hiroshi Hosoda
- Department of Thoracic Surgery, Tokyo Kyosai Hospital, Tokyo, Japan
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8
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Kitada S, Kawada Y, Osaga S, Kato M, Kikuchi S, Wakami K, Seo Y, Ohte N. Left ventricular contractile performance and heart failure in patients with left ventricular ejection fraction more than 40. Heart Vessels 2020; 35:1689-1698. [PMID: 32504319 PMCID: PMC7595999 DOI: 10.1007/s00380-020-01641-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 05/29/2020] [Indexed: 01/06/2023]
Abstract
Heart failure (HF) with mid-range left ventricular ejection fraction (LVEF) (HFmrEF) is considered a new category of HF and LVEF < 50%, which is the upper threshold of LVEF for HFmrEF, is thought to represent a mild decrease in LV contractile performance. We aimed to consider an LVEF threshold value to be taken as a surrogate for impairment of LV contractile performance, resulting in new-onset HF. We enrolled 398 patients with LVEF ≥ 40% that underwent cardiac catheterization. Using the LV pressure recording with a catheter-tipped micromanometer, we calculated the inertia force of late systolic aortic flow (IFLSAF), which was sensitive to the slight impairment in LV contractile performance. We evaluated the utility of the IFLSAF for predicting future cardiovascular death or hospitalization for HF. We performed a receiver operating characteristic (ROC) curve analysis to determine the best LVEF threshold value for distinguishing whether the LV maintained the IFLSAF. A multivariate Cox proportional-hazards model revealed that the loss of IFLSAF was significantly associated with the future adverse events (HR: 7.798, 95%CI 2.174–27.969, p = 0.002). According to the ROC curve analysis, an LVEF ≥ 58% indicated that the LV could maintain the IFLSAF. We concluded that the loss of IFLSAF, which could reflect even slight impairment in LV contractile performance, was a reliable indicator for new-onset HF in patients with LVEF ≥ 40%. LVEF ≥ 58% could be taken as a surrogate for the IFLSAF maintenance; this threshold could be useful for risk stratification of new-onset HF in patients with preserved LVEF.
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Affiliation(s)
- Shuichi Kitada
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan.
| | - Yu Kawada
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
| | - Satoshi Osaga
- Department of Medical Innovation, Nagoya City University, Nagoya, Japan
| | - Marina Kato
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
| | - Shohei Kikuchi
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
| | - Kazuaki Wakami
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
| | - Yoshihiro Seo
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
| | - Nobuyuki Ohte
- Department of Cardiology, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-Ku, Nagoya, Japan
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Kawada Y, Yamada A, Hoshino N, Hoshino M, Yamabe S, Takada K, Sakaguchi E, Ozaki Y. P251 Right ventricular free wall dissection clearly detected and recorded by echocardiography: a fatal complication after inferior myocardial infarction. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.112] [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
An 81-year-old man was transferred to our institution by ambulance because of poor feeding, general fatigue and slight disorientation lasting for a week. On arrival, he was awake and able to speak, however, his blood pressure was low at 61/43 mmHg in spite of his medical history of hypertension. His ECG showed abnormal Q waves and ST elevation in II, III, aVF leads. The echo exam detected severe hypokinesis in the left ventricular inferior wall and reduced ejection fraction at 30%. Pericardial effusion was not observed in the first echo exam. The patient was diagnosed as cardiogenic shock due to recent inferior myocardial infarction. Coronary angiography was performed, which detected total occlusion of mid right coronary artery, followed by a successful percutaneous coronary intervention (PCI) with a drug-eluting stent under the support of intra-aortic balloon pumping. Nevertheless, his blood pressure remained low and intravenous adrenaline administration was necessary during and even after PCI. To detect the cause of prolonged low blood pressure, echo was performed again immediately after PCI. The echo exam detected new findings: right ventricular posterior free wall was dissected and abnormal shunt flows were obviously observed from left ventricle to right atrium through the dissection cavity during systole. An urgent surgical repair was considered as the only option for his survival, however, his family did not accept it because the operation itself was too risky. On the next day of his admission, he passed away. Right ventricular free wall dissection is a very rare but fatal complication after inferior myocardial infarction, nevertheless, we could detect it by echocardiography with clearly recorded images.
Abstract P251 Figure.
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Affiliation(s)
- Y Kawada
- Fujita Health University School of Medicine, Toyoake, Japan
| | - A Yamada
- Fujita Health University School of Medicine, Toyoake, Japan
| | - N Hoshino
- Fujita Health University School of Medicine, Toyoake, Japan
| | - M Hoshino
- Fujita Health University School of Medicine, Toyoake, Japan
| | - S Yamabe
- Fujita Health University School of Medicine, Toyoake, Japan
| | - K Takada
- Fujita Health University School of Medicine, Toyoake, Japan
| | - E Sakaguchi
- Fujita Health University School of Medicine, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University School of Medicine, Toyoake, Japan
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Sakaguchi E, Yamada A, Hoshino M, Takada K, Hoshino N, Kawada Y, Yamabe S, Ozaki Y. P1386 A change in left ventricular global longitudinal strain is a prognostic indicator in congestive heart failure patients with preserved ejection fraction. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.819] [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
Purposes
We examined how changes in left ventricular (LV) global longitudinal strain (GLS) were associated with prognosis in patients with preserved LV ejection fraction (LVEF) after congestive heart failure (HF) admission.
Methods
We studied 123 consecutive patients (age 70 ± 15 years, 55% male) who had been hospitalized due to congestive HF with preserved LVEF (> 50%). The exclusion criteria were atrial fibrillation and inadequate echo image quality for strain analyses. The patients underwent speckle-tracking echocardiography and measurement of plasma NT-ProBNP levels on the same day at the time of hospital admission as well as in the stable condition after discharge. Differences in GLS, LVEF and NT-ProBNP (delta GLS, LVEF and NT-ProBNP ; 2nd – 1st measurements) were calculated. The study end points were all-cause mortality and cardiac events.
Results
Mean periods of echo performance after hospitalization were 2 ±1days (1st echo) and 240 ± 289 days (2nd echo), respectively. During the follow-up (974 ± 626 days), 12 patients died and 25 patients were hospitalized because of HF worsening. In multivariate analysis, delta GLS and follow-up GLS were prognostic factors, whereas baseline and follow-up LVEF, NT-ProBNP, changes in LVEF and NT-ProBNP could not predict cardiac events. Delta GLS (p = 0.002) turned out to be the best independent prognosticator. Receiver operating characteristics analysis revealed that -0.6% of delta GLS was the optimal cut-off value to predict cardiac events and mortality (sensitivity 76%, specificity 67%, AUC 0.75). Kaplan-Meier analysis showed that patients with delta GLS more than -0.6% experienced significantly less cardiac events during the follow-up period (p < 0.0001, log-rank).
Conclusion
A change in LV GLS after congestive HF admission was a predictor of the prognosis in patients with preserved LVEF. It would be useful to check the changes in GLS in those with preserved LVEF after discharge.
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Affiliation(s)
- E Sakaguchi
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - A Yamada
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - M Hoshino
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - K Takada
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - N Hoshino
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - Y Kawada
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - S Yamabe
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University School of Medicine, Cardiology, Toyoake, Japan
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11
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Kawamura G, Okayama H, Kido S, Aono T, Matsuda K, Tanaka Y, Iseki Y, Hosokawa S, Kosaki T, Shigematsu T, Kawada Y, Hiasa G, Yamada T, Kazatani Y. P6005Incidence and clinical characteristics of coronary artery spasm in patients with out-of-hospital cardiac arrest. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0725] [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
Substantial cases of out-of-hospital cardiac arrest (OHCA) due to acute coronary syndrome have been recognized thus far, but there have been few reports about the aetiology of patients with OHCA without the organic heart disease. Especially, coronary artery spasm would be one of the causes of OHCA.
Purpose
This study aimed to investigate causes of OHCA without the organic heart disease and to investigate the characteristics and angiographic findings of OHCA patients with vasospastic angina (VSA).
Methods
Between January 2010 and April 2018, 920 patients with OHCA caused by probable or definite cardiovascular disease were transferred to our hospital. Return of spontaneous contraction was successfully achieved in 151 patients, among whom diagnosis was made in 130 patients. First, we analysed the causes of OHCA in these patients. Second, we compared clinical and angiographic characteristics between the VSA group with OHCA (OHCA-VSA) and the VSA group without OHCA (stable VSA; n=72) from our database.
Results
Among the 130 patients, 95 (73%) had the organic heart disease; 72, acute coronary syndrome; 19, myocardial disease; 2, valvular heart disease; and 1, congenital heart disease. There were 35 patients (27%) without the organic heart disease. Nineteen patients had primary (i.e., Brugada syndrome, QT prolongation) or secondary arrhythmia (i.e. drug adverse effect). Electrocardiogram, coronary angiogram, and LV structure and function were normal in 35 patients. However, there were 16 patients (11%) with VSA defined by Japanese guideline. The OHCA-VSA group was significantly younger (50±14) than the stable VSA group (64±11, P=0.003). The incidence of diffuse-type spasm in the OHCA-VSA group (100%) was significantly higher than that in the stable VSA group (100% vs. 69%, P<0.05). In addition, the incidence of triple-vessel coronary spasm in the OHCA-VSA group was significantly higher than that in the stable VSA group (86% vs. 25%, P=0.003).
Conclusion
OHCA patients without the organic heart disease had considerable cases of VSA, in addition to primary or secondary arrhythmia. Furthermore, the severity of spasm in the OHCA-VSA group was more serious and extensive than in comparison with the stable VSA group.
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Affiliation(s)
- G Kawamura
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - H Okayama
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - S Kido
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Aono
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - K Matsuda
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Tanaka
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Iseki
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - S Hosokawa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Kosaki
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Shigematsu
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kawada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - G Hiasa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Yamada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kazatani
- Ehime Prefectural Central Hospital, Matsuyama, Japan
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12
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Nakasuka K, Kitada S, Kawada Y, Kato M, Ohte N. P986Future risk of bradyarrhythmias in patients with hypertrophic cardiomyopathy and implantable cardioverter defibrillator indication. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0579] [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
Subcutaneous-implantable cardioverter defibrillator (S-ICD) has been shown to be effective for prevention of sudden cardiac death. Patients with hypertrophic cardiomyopathy (HCM) having ICD indication are considered to introduce either S-ICD or transvenous-ICD, however it is uncertain which is better since S-ICD is not suitable for patients who need pacing and data on the necessity for pacing in HCM patients are limited.
Purpose
The purpose of this study was to investigate the risk factors associated with the future risk of bradyarrhythmias needed to be paced in patients with HCM and ICD indication.
Methods
This is a retrospective, single-center cohort study. Of 169 HCM patients diagnosed in our institution, 80 with ICD indication in accordance with the Japanese guideline in 2011 were enrolled as study subjects (31 females, mean age 63±15 years). They were divided into two groups – patients who progressed to bradyarrhythmias which needed pacing during the follow-up period (Brady group) and those who not (Non-brady group). Baseline characteristics at the time of diagnosis of HCM including demographic information, the results of clinical examination such as blood test, echocardiography and electrocardiography (ECG) were compared between the Brady and Non-brady group.
Results
During a mean follow-up period of 6.8±5.4 years, 9 patients (11%) progressed bradyarrhtyhmias which needed pacing. Symptomatic sick sinus syndrome (SSS) was the primary cause (7 SSS, 1 atrial fibrillation [AF] with bradycardia, 1 after atrioventricular nodal ablation). Comparing between the Brady and Non-brady group, there was no significant difference in clinical variables such as age, heart rate, PR interval and QRS duration in ECG, EF levels, BNP levels, beta-blocker usage rate, prevalence of hypertension or diabetes mellitus. On the other hand, women were more in Brady group than in Non-brady group (7/9, 78% vs. 24/71, 34%; p=0.01). Furthermore, more patients in Brady group had documented AF at the beginning and during follow-up period (7/9, 78% vs. 25/71, 36%; p=0.02) and took anti-arrhythmic drugs (AAD) (8/9, 89% vs. 19/71, 27%; p<0.001) including amiodarone than those in Non-brady group.
Conclusion
In HCM patients with ICD indication, around 10% of patients have a potential risk of bradyarrhythmias needed to be paced, especially in female, those with AF and/or AAD usage.
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Affiliation(s)
- K Nakasuka
- Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - S Kitada
- Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Y Kawada
- Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - M Kato
- Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - N Ohte
- Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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13
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Abstract
Serum squamous cell carcinoma related antigen (SCC-Ag) values were determined in 86 patients with urothelial cancers. Mean + standard deviation for serum SCC-Ag. was 3.4 ± 0.98 ng/ml and positive values (> 2.0 ng/ml) were found in 27%. Neither pathological stage nor cell grade of the urothelial cancer showed any relation to serum SCC-Ag. Serum SCC-Ag. changed parallel to the clinical course. These results suggest that, as there is no specific tumor marker in urothelial cancer, serum SCC-Ag. may be a useful aid in diagnosing cancer and monitoring these patients. Used together with another non-specific marker, an increase in the accuracy of diagnosis of these malignancies can be expected.
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Affiliation(s)
- Y Takahashi
- Department of Urology, Gifu University School of Medicine, Japan
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14
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Shigematsu T, Okayama H, Kawaguchi N, Fukuyama N, Iseki Y, Matsuda K, Tanaka Y, Hosokawa S, Kosaki T, Kawamura G, Kawada Y, Hiasa G, Yamada T, Kazatani Y, Matsuoka H. P2698A non-invasive assessment of fractional flow reserve using hybrid 13N-ammonia positron emission tomography/computed tomography coronary angiography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2698] [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)
- T Shigematsu
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - H Okayama
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - N Kawaguchi
- Ehime University Graduate School of Medicine, Radiology, Toon, Japan
| | - N Fukuyama
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Iseki
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - K Matsuda
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Tanaka
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - S Hosokawa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Kosaki
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - G Kawamura
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kawada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - G Hiasa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Yamada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kazatani
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - H Matsuoka
- Ehime Prefectural Central Hospital, Matsuyama, Japan
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15
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Kawamura G, Okayama H, Kawaguchi N, Kido S, Matsuda K, Aono T, Kosaki T, Hosokawa S, Tanaka Y, Shigematsu T, Kawada Y, Hiasa G, Yamada T, Matsuoka H, Kazatani Y. P1712Diagnostic performance of coronary flow reserve ratio for the detection of coronary artery disease on 13N-ammonia positron emission tomography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1712] [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)
- G Kawamura
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - H Okayama
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - N Kawaguchi
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - S Kido
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - K Matsuda
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Aono
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Kosaki
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - S Hosokawa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Tanaka
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Shigematsu
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kawada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - G Hiasa
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - T Yamada
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - H Matsuoka
- Ehime Prefectural Central Hospital, Matsuyama, Japan
| | - Y Kazatani
- Ehime Prefectural Central Hospital, Matsuyama, Japan
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16
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Ito T, Goto T, Kawada Y, Ohte N. Delayed right ventricular perforation complicated by intracardiac thrombosis after implantable cardioverter-defibrillator implantation. J Arrhythm 2018; 34:74-76. [PMID: 29721117 PMCID: PMC5828261 DOI: 10.1002/joa3.12007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 10/02/2017] [Indexed: 11/12/2022] Open
Abstract
Cardiac perforation and intracardiac thrombosis are infrequent complications after implantable cardioverter‐defibrillator (ICD) implantation, and a case of lead perforation complicated by thrombosis is extremely rare. We report the case of a 66‐year‐old man with delayed ICD lead perforation concomitant with intracardiac lead thrombosis successfully treated by anticoagulant therapy followed by transvenous lead management.
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Affiliation(s)
- Tsuyoshi Ito
- Department of Cardio-Renal Medicine and Hypertension Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Toshihiko Goto
- Department of Cardio-Renal Medicine and Hypertension Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Yu Kawada
- Department of Cardio-Renal Medicine and Hypertension Nagoya City University Graduate School of Medical Sciences Nagoya Japan
| | - Nobuyuki Ohte
- Department of Cardio-Renal Medicine and Hypertension Nagoya City University Graduate School of Medical Sciences Nagoya Japan
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17
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Yamada A, Kawada Y, Miyagi M, Hoshino N, Sakaguchi E, Takada K, Ozaki Y. A Case of Severe Aortic Regurgitation Caused by Fissured Aortic Cusps Reconstructed with Autologous Pericardium. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.373] [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: 11/30/2022]
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18
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Kitada S, Kawada Y, Kato M, Kikuchi S, Ohte N. Association of Loss of Inertia Force of Late Systolic Aortic Flow with Heart Failure with Preserved Left Ventricular Ejection Fraction. J Card Fail 2017. [DOI: 10.1016/j.cardfail.2017.08.274] [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: 10/18/2022]
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19
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Kawada Y, Kitada S, Kato M, Kikuchi S, Ohte N. Loss of Inertia Force of Late-systolic Aortic Flow in Patients with Mid-range Left Ventricular Ejection Fraction Deterioration. J Card Fail 2017. [DOI: 10.1016/j.cardfail.2017.08.075] [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: 11/25/2022]
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20
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Ui A, Kobayashi M, Kawada Y, Kurihara Y, Sugita Y, Kumazawa S, Takasaki C, Ishibashi H, Okubo K. P1.03-026 Measurement of Pulmonary Artery on CT to Predict Acute Exacerbation of Interstitial Pneumonia after Pulmonary Resection for Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2016.11.697] [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]
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21
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Yamada T, Kawada Y, Sato Y. 4πβ(PS)–4πγ(GE) list-mode coincidence counter and its applications. Appl Radiat Isot 2016; 109:414-417. [DOI: 10.1016/j.apradiso.2015.12.022] [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] [Received: 04/13/2015] [Accepted: 12/04/2015] [Indexed: 10/22/2022]
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22
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Tshoo K, Satou Y, Bhang H, Choi S, Nakamura T, Kondo Y, Deguchi S, Kawada Y, Kobayashi N, Nakayama Y, Tanaka K, Tanaka N, Togano Y, Aoi N, Ishihara M, Motobayashi T, Otsu H, Sakurai H, Takeuchi S, Yoneda K, Delaunay F, Gibelin J, Marqués F, Orr N, Honda T, Matsushita M, Kobayashi T, Miyashita Y, Sumikama T, Yoshinaga K, Shimoura S, Sohler D, Zheng T, Cao Z, Li Z. Neutron occupancy of 0 d5/2orbital in 24O. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602103] [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: 11/14/2022] Open
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23
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Kawada Y, Yunoki A, Yamada T, Hino Y. Gamma geometry dependency of efficiency functions in the 4πβ-γ coincidence measurements of complex decaying nuclides. Appl Radiat Isot 2014; 87:183-7. [PMID: 24373824 DOI: 10.1016/j.apradiso.2013.11.106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 05/29/2013] [Accepted: 11/22/2013] [Indexed: 11/15/2022]
Abstract
In order to clarify the γ-efficiency dependency of 4πβ-γ efficiency functions, a series of 4πβ-γ efficiency extrapolation measurements of a (134)Cs source were carried out for a wide variety of γ-geometries using a 4πβ(PS)-4πγ detector configuration. As the source is situated in the plastic scintillator (PS) β-detector, the γ-efficiency of the system can be readily changed by extracting the β-detector from the well-hole in a series of stages. For data acquisition and analyses, a list-mode two-parameter data acquisition system was employed. The forms of the extrapolation curves were monitored with decreasing γ-geometry, eventually exhibiting a similar behavior to those obtained in a usual 4πβ-γ coincidence counting system. The experimental results and considerations suggested that the γ-geometry dependency of the efficiency functions were due to summing effects in the γ-channel, and some qualitative remarks on the form of the extrapolation functions are given.
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Affiliation(s)
- Y Kawada
- National Metrology Institute of Japan, National Institute of Advanced Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan.
| | - A Yunoki
- National Metrology Institute of Japan, National Institute of Advanced Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan
| | - T Yamada
- National Metrology Institute of Japan, National Institute of Advanced Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan; Japan Radioisotope Association, 2-28-45, Hon-Komagome, Bunkyo, Tokyo 113-3941, Japan
| | - Y Hino
- National Metrology Institute of Japan, National Institute of Advanced Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan
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24
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Ishizu H, Yamada T, Kawada Y. Response of Ge photon detectors to beta-rays and possible reduction of photopeak areas due to beta-gamma coincidence summing effects. Appl Radiat Isot 2013; 87:397-401. [PMID: 24331856 DOI: 10.1016/j.apradiso.2013.11.068] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 11/19/2013] [Indexed: 11/28/2022]
Abstract
In the use of photon detectors having sensitivity to β-rays or internal conversion electrons (CEs), β-γ and/or X-CE coincidence summing may arise. In particular, an n-type germanium detector has a thin dead layer and window, causing considerably higher sensitivity to β-rays and/or CEs especially when sources are located at a small source-to-detector distance. In the present research, reduction of the photopeak area due to β-γ or X-CE coincidence summing has been studied for three germanium detectors.
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Affiliation(s)
- H Ishizu
- Japan Radioisotope Association, 28-45, Honkomagome 2, Bunkyo-ku, Tokyo 113-8941, Japan.
| | - T Yamada
- Japan Radioisotope Association, 28-45, Honkomagome 2, Bunkyo-ku, Tokyo 113-8941, Japan
| | - Y Kawada
- National Metrology Institute of Japan/National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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25
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Yunoki A, Kawada Y, Yamada T, Unno Y, Sato Y, Hino Y. Absorption and backscatter of internal conversion electrons in the measurements of surface contamination of ¹³⁷Cs. Appl Radiat Isot 2013; 81:261-7. [PMID: 23660084 DOI: 10.1016/j.apradiso.2013.03.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 03/09/2013] [Indexed: 11/19/2022]
Abstract
We measured 4π and 2π counting efficiencies for internal conversion electrons (ICEs), gross β-particles and also β-rays alone with various source conditions regarding absorber and backing foil thickness using e-X coincidence technique. Dominant differences regarding the penetration, attenuation and backscattering properties among ICEs and β-rays were revealed. Although the abundance of internal conversion electrons of (137)Cs-(137)Ba is only 9.35%, 60% of gross counts may be attributed to ICEs in worse source conditions. This information will be useful for radionuclide metrology and for surface contamination monitoring.
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Affiliation(s)
- A Yunoki
- National Metrology Institute of Japan, National Institute of Advanced Industrial Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.
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26
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Asahara S, Shibutani Y, Teruyama K, Inoue HY, Kawada Y, Etoh H, Matsuda T, Kimura-Koyanagi M, Hashimoto N, Sakahara M, Fujimoto W, Takahashi H, Ueda S, Hosooka T, Satoh T, Inoue H, Matsumoto M, Aiba A, Kasuga M, Kido Y. Ras-related C3 botulinum toxin substrate 1 (RAC1) regulates glucose-stimulated insulin secretion via modulation of F-actin. Diabetologia 2013; 56:1088-97. [PMID: 23412604 PMCID: PMC3622740 DOI: 10.1007/s00125-013-2849-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 01/17/2013] [Indexed: 11/03/2022]
Abstract
AIMS/HYPOTHESIS The small G-protein ras-related C3 botulinum toxin substrate 1 (RAC1) plays various roles in mammalian cells, such as in the regulation of cytoskeletal organisation, cell adhesion, migration and morphological changes. The present study examines the effects of RAC1 ablation on pancreatic beta cell function. METHODS Isolated islets from pancreatic beta cell-specific Rac1-knockout (betaRac1(-/-)) mice and RAC1 knockdown INS-1 insulinoma cells treated with small interfering RNA were used to investigate insulin secretion and cytoskeletal organisation in pancreatic beta cells. RESULTS BetaRac1(-/-) mice showed decreased glucose-stimulated insulin secretion, while there were no apparent differences in islet morphology. Isolated islets from the mice had blunted insulin secretion in response to high glucose levels. In RAC1 knockdown INS-1 cells, insulin secretion was also decreased in response to high glucose levels, consistent with the phenotype of betaRac1(-/-) mice. Even under high glucose levels, RAC1 knockdown INS-1 cells remained intact with F-actin, which inhibits the recruitment of the insulin granules, resulting in an inhibition of insulin secretion. CONCLUSIONS/INTERPRETATION In RAC1-deficient pancreatic beta cells, F-actin acts as a barrier for insulin granules and reduces glucose-stimulated insulin secretion.
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Affiliation(s)
- S. Asahara
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Y. Shibutani
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - K. Teruyama
- Division of Medical Chemistry, Kobe University Graduate School of Health Sciences, Kobe, 654-0142 Japan
| | - H. Y. Inoue
- Division of Medical Chemistry, Kobe University Graduate School of Health Sciences, Kobe, 654-0142 Japan
| | - Y. Kawada
- Division of Medical Chemistry, Kobe University Graduate School of Health Sciences, Kobe, 654-0142 Japan
| | - H. Etoh
- Division of Medical Chemistry, Kobe University Graduate School of Health Sciences, Kobe, 654-0142 Japan
| | - T. Matsuda
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - M. Kimura-Koyanagi
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - N. Hashimoto
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - M. Sakahara
- Cancer Institute, Japanese Foundation of Cancer Research, Tokyo, Japan
| | - W. Fujimoto
- Division of Cellular and Molecular Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - H. Takahashi
- Division of Cellular and Molecular Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - S. Ueda
- Kobe University Graduate School of Agricultural Science, Kobe, Japan
| | - T. Hosooka
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - T. Satoh
- Division of Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - H. Inoue
- Department of Physiology and Metabolism, Brain/Liver Interface Medicine Research Center, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - M. Matsumoto
- Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - A. Aiba
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - M. Kasuga
- Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Y. Kido
- Division of Diabetes and Endocrinology, Kobe University Graduate School of Medicine, Kobe, Japan
- Division of Medical Chemistry, Kobe University Graduate School of Health Sciences, Kobe, 654-0142 Japan
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27
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Nishigaki M, Kawada Y, Misaki T, Murata K, Goshima T, Hirokawa T, Yamada C, Shimada M, Nakanishi M. Mitotic phosphorylation of MPP8 by cyclin-dependent kinases regulates chromatin dissociation. Biochem Biophys Res Commun 2013; 432:654-9. [DOI: 10.1016/j.bbrc.2013.02.027] [Citation(s) in RCA: 7] [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] [Received: 01/23/2013] [Accepted: 02/04/2013] [Indexed: 11/26/2022]
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28
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Kawada Y, Onose M, Tojo R, Komine T, Sugita R. Magnetic domain structure in thin CoPt perpendicular magnetic anisotropy films. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134007002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tshoo K, Satou Y, Bhang H, Choi S, Nakamura T, Kondo Y, Deguchi S, Kawada Y, Kobayashi N, Nakayama Y, Tanaka KN, Tanaka N, Aoi N, Ishihara M, Motobayashi T, Otsu H, Sakurai H, Takeuchi S, Togano Y, Yoneda K, Li ZH, Delaunay F, Gibelin J, Marqués FM, Orr NA, Honda T, Matsushita M, Kobayashi T, Miyashita Y, Sumikama T, Yoshinaga K, Shimoura S, Sohler D, Zheng T, Cao ZX. N = 16 spherical shell closure in 24O. Phys Rev Lett 2012; 109:022501. [PMID: 23030155 DOI: 10.1103/physrevlett.109.022501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Indexed: 06/01/2023]
Abstract
The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p')23O + n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin parity of the first excited state, observed at E(x) = 4.65±0.14 MeV, was determined to be J(π) = 2+ from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter β2 of the 2(1)+ state was deduced, for the first time, to be 0.15±0.04. The relatively high excitation energy and small β2 value are indicative of the N = 16 shell closure in 24O.
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Affiliation(s)
- K Tshoo
- Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
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30
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Kawada Y, Yamada T, Unno Y, Yunoki A, Sato Y, Hino Y. A simple and versatile data acquisition system for software coincidence and pulse-height discrimination in 4πβ-γ coincidence experiments. Appl Radiat Isot 2012; 70:2031-6. [PMID: 22429558 DOI: 10.1016/j.apradiso.2012.02.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 02/19/2012] [Indexed: 11/24/2022]
Abstract
A simple but versatile data acquisition system for software coincidence experiments is described, in which any time stamping and live time controller are not provided. Signals from β- and γ-channels are fed to separately two fast ADCs (16 bits, 25 MHz clock maximum) via variable delay circuits and pulse-height stretchers, and also to pulse-height discriminators. The discriminating level was set to just above the electronic noise. Two ADCs were controlled with a common clock signal, and triggered simultaneously by the logic OR pulses from both discriminators. Paired digital signals for each sampling were sent to buffer memories connected to main PC with a FIFO (First-In, First-Out) pipe via USB. After data acquisition in list mode, various processing including pulse-height analyses was performed using MS-Excel (version 2007 and later). The usefulness of this system was demonstrated for 4πβ(PS)-4πγ coincidence measurements of (60)Co, (134)Cs and (152)Eu. Possibilities of other extended applications will be touched upon.
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Affiliation(s)
- Y Kawada
- National Metrology Institute of Japan, National Institute of Advanced Industrial Sciences and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.
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Sumikama T, Yoshinaga K, Watanabe H, Nishimura S, Miyashita Y, Yamaguchi K, Sugimoto K, Chiba J, Li Z, Baba H, Berryman JS, Blasi N, Bracco A, Camera F, Doornenbal P, Go S, Hashimoto T, Hayakawa S, Hinke C, Ideguchi E, Isobe T, Ito Y, Jenkins DG, Kawada Y, Kobayashi N, Kondo Y, Krücken R, Kubono S, Lorusso G, Nakano T, Kurata-Nishimura M, Odahara A, Ong HJ, Ota S, Podolyák Z, Sakurai H, Scheit H, Steiger K, Steppenbeck D, Takano S, Takashima A, Tajiri K, Teranishi T, Wakabayashi Y, Walker PM, Wieland O, Yamaguchi H. Structural evolution in the neutron-rich nuclei ¹⁰⁶Zr and ¹⁰⁸Zr. Phys Rev Lett 2011; 106:202501. [PMID: 21668223 DOI: 10.1103/physrevlett.106.202501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Indexed: 05/30/2023]
Abstract
The low-lying states in ¹⁰⁶Zr and ¹⁰⁸Zr have been investigated by means of β-γ and isomer spectroscopy at the radioactive isotope beam factory (RIBF), respectively. A new isomer with a half-life of 620 ± 150 ns has been identified in ¹⁰⁸Zr. For the sequence of even-even Zr isotopes, the excitation energies of the first 2⁺ states reach a minimum at N = 64 and gradually increase as the neutron number increases up to N = 68, suggesting a deformed subshell closure at N = 64. The deformed ground state of ¹⁰⁸Zr indicates that a spherical subshell gap predicted at N = 70 is not large enough to change the ground state of ¹⁰⁸Zr to the spherical shape. The possibility of a tetrahedral shape isomer in ¹⁰⁸Zr is also discussed.
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Affiliation(s)
- T Sumikama
- Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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32
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Nishimura S, Li Z, Watanabe H, Yoshinaga K, Sumikama T, Tachibana T, Yamaguchi K, Kurata-Nishimura M, Lorusso G, Miyashita Y, Odahara A, Baba H, Berryman JS, Blasi N, Bracco A, Camera F, Chiba J, Doornenbal P, Go S, Hashimoto T, Hayakawa S, Hinke C, Ideguchi E, Isobe T, Ito Y, Jenkins DG, Kawada Y, Kobayashi N, Kondo Y, Krücken R, Kubono S, Nakano T, Ong HJ, Ota S, Podolyák Z, Sakurai H, Scheit H, Steiger K, Steppenbeck D, Sugimoto K, Takano S, Takashima A, Tajiri K, Teranishi T, Wakabayashi Y, Walker PM, Wieland O, Yamaguchi H. β-decay half-lives of very neutron-rich Kr to Tc isotopes on the boundary of the r-process path: an indication of fast r-matter flow. Phys Rev Lett 2011; 106:052502. [PMID: 21405387 DOI: 10.1103/physrevlett.106.052502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Indexed: 05/30/2023]
Abstract
The β-decay half-lives of 38 neutron-rich isotopes from (36)Kr to (43)Tc have been measured; the half-lives of (100)Kr, (103-105)Sr, (106-108)Y, (108-110)Zr, (111,112)Nb, (112-115)Mo, and (116,117)Tc are reported here. The results when compared with previous standard models indicate an overestimation in the predicted half-lives by a factor of 2 or more in the A≈110 region. A revised model based on the second generation gross theory of β decay better predicts the measured half-lives and suggests a more rapid flow of the rapid neutron-capture process (r-matter flow) through this region than previously predicted.
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Affiliation(s)
- S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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33
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Ishii S, Kawabata S, Sakaki K, Tomizawa S, Shinomiya K, Okawa A, Adachi Y, Kawada Y, Nakamura R, Fujii S, Sekihara K. P33-26 Neuromagnetic field measurement in the lumbar spine. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)61245-x] [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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34
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Kawada Y, Yamada T, Nagai A. Temperature dependence of gain shift in γ-ray spectrometry system involving a long connecting cable. Appl Radiat Isot 2010; 68:1445-7. [DOI: 10.1016/j.apradiso.2009.11.024] [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: 11/30/2022]
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35
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Matsukado K, Fujimoto M, Takahashi H, Kawada Y, Ohsuka S, Aoshima S. A multichannel time-of-flight system for observation of energetic ions of multispecies generated from relativistic laser plasma. Rev Sci Instrum 2010; 81:023304. [PMID: 20192489 DOI: 10.1063/1.3309781] [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] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A multichannel time-of-flight (TOF) system was constructed to observe the ions generated from relativistic laser plasma, where the ions have polychromatic energies and multiple species. The TOF system is composed of a ten-channel scintillation detector array and an electromagnet that generates a magnetic field of 0-1.24 T. The magnet field enables us to analyze protons, deuterons, and full-stripped carbon ions to 50, 25, and 150 MeV, respectively. The system experimentally identified protons of 0.27-1.6 MeV energy and ions of a half specific charge (deuterons of 0.3-0.8 MeV and full-stripped carbons of 1.8-4.8 MeV). The measured TOF values agree well with the calculated values within the designed accuracy; +/-2.5 ns for protons and +/-5 ns for the others (d or C(6+)) on each detector channel. Comparison of ion numbers detected by a track detector (CR-39) and the TOF system enabled us to obtain the number of ions detected on each scintillation counter with less than 16% error.
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Affiliation(s)
- K Matsukado
- Central Research Laboratory, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamakita, Hamamatsu, Shizuoka 434-8601, Japan
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36
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Nakamura T, Kobayashi N, Kondo Y, Satou Y, Aoi N, Baba H, Deguchi S, Fukuda N, Gibelin J, Inabe N, Ishihara M, Kameda D, Kawada Y, Kubo T, Kusaka K, Mengoni A, Motobayashi T, Ohnishi T, Ohtake M, Orr NA, Otsu H, Otsuka T, Saito A, Sakurai H, Shimoura S, Sumikama T, Takeda H, Takeshita E, Takechi M, Takeuchi S, Tanaka K, Tanaka KN, Tanaka N, Togano Y, Utsuno Y, Yoneda K, Yoshida A, Yoshida K. Halo structure of the island of inversion nucleus 31Ne. Phys Rev Lett 2009; 103:262501. [PMID: 20366309 DOI: 10.1103/physrevlett.103.262501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Indexed: 05/29/2023]
Abstract
The cross sections for single-neutron removal from the very neutron-rich nucleus 31Ne on Pb and C targets have been measured at 230 MeV/nucleon using the RIBF facility at RIKEN. The deduced large Coulomb breakup cross section of 540(70) mb is indicative of a soft E1 excitation. Comparison with direct-breakup model calculations suggests that the valence neutron of 31Ne occupies a low-l orbital (most probably 2p(3/2)) with a small separation energy (S(n) approximately < 0.8 MeV), instead of being predominantly in the 1f(7/2) orbital as expected from the conventional shell ordering. These findings suggest that 31Ne is the heaviest halo system known.
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Affiliation(s)
- T Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
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37
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Doornenbal P, Scheit H, Aoi N, Takeuchi S, Li K, Takeshita E, Wang H, Baba H, Deguchi S, Fukuda N, Geissel H, Gernhäuser R, Gibelin J, Hachiuma I, Hara Y, Hinke C, Inabe N, Itahashi K, Itoh S, Kameda D, Kanno S, Kawada Y, Kobayashi N, Kondo Y, Krücken R, Kubo T, Kuboki T, Kusaka K, Lantz M, Michimasa S, Motobayashi T, Nakamura T, Nakao T, Namihira K, Nishimura S, Ohnishi T, Ohtake M, Orr NA, Otsu H, Ozeki K, Satou Y, Shimoura S, Sumikama T, Takechi M, Takeda H, Tanaka KN, Tanaka K, Togano Y, Winkler M, Yanagisawa Y, Yoneda K, Yoshida A, Yoshida K, Sakurai H. Spectroscopy of 32Ne and the "Island of Inversion". Phys Rev Lett 2009; 103:032501. [PMID: 19659270 DOI: 10.1103/physrevlett.103.032501] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Indexed: 05/28/2023]
Abstract
We report on the first spectroscopic study of the N=22 nucleus 32Ne at the newly completed RIKEN Radioactive Ion Beam Factory. A single gamma-ray line with an energy of 722(9) keV was observed in both inelastic scattering of a 226 MeV/u 32Ne beam on a carbon target and proton removal from 33Na at 245 MeV/u. This transition is assigned to the deexcitation of the first Jpi=2+ state in 32Ne to the 0+ ground state. Interpreted through comparison with state-of-the-art shell-model calculations, the low excitation energy demonstrates that the "island of inversion" extends to at least N=22 for the Ne isotopes.
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Affiliation(s)
- P Doornenbal
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
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38
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Silveri MM, Dikan J, Ross AJ, Jensen JE, Kamiya T, Kawada Y, Renshaw PF, Yurgelun-Todd DA. Citicoline enhances frontal lobe bioenergetics as measured by phosphorus magnetic resonance spectroscopy. NMR Biomed 2008; 21:1066-1075. [PMID: 18816480 DOI: 10.1002/nbm.1281] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Citicoline supplementation has been used to ameliorate memory disturbances in older people and those with Alzheimer's disease. This study used MRS to characterize the effects of citicoline on high-energy phosphate metabolites and constituents of membrane synthesis in the frontal lobe. Phosphorus ((31)P) metabolite data were acquired using a three-dimensional chemical-shift imaging protocol at 4 T from 16 healthy men and women (mean +/- SD age 47.3 +/- 5.4 years) who orally self-administered 500 mg or 2000 mg Cognizin Citicoline (Kyowa Hakko Kogyo Co., Ltd, Ibaraki, Japan) for 6 weeks. Individual (31)P metabolites were quantified in the frontal lobe (anterior cingulate cortex) and a comparison region (parieto-occipital cortex). Significant increases in phosphocreatine (+7%), beta-nucleoside triphosphates (largely ATP in brain, +14%) and the ratio of phosphocreatine to inorganic phosphate (+32%), as well as significant changes in membrane phospholipids, were observed in the anterior cingulate cortex after 6 weeks of citicoline treatment. These treatment-related alterations in phosphorus metabolites were not only regionally specific, but tended to be of greater magnitude in subjects who received the lower dose. These data show that citicoline improves frontal lobe bioenergetics and alters phospholipid membrane turnover. Citicoline supplementation may therefore help to mitigate cognitive declines associated with aging by increasing energy reserves and utilization, as well as increasing the amount of essential phospholipid membrane components needed to synthesize and maintain cell membranes.
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Affiliation(s)
- M M Silveri
- Cognitive Neuroimaging Laboratory, McLean Hospital & Harvard Medical School, 115 Mill Street, Belmont, MA 02478-9106, USA.
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39
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40
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Kawata H, Kishimoto H, Iwai S, Ishimaru K, Saito T, Kayatani F, Inamura N, Hamamichi Y, Kawada Y, Nasuno S, Maekawa S. [Long term outcome of arterial switch surgery for transposition of the great arteries: evaluation of the reconstruction of the pulmonary artery]. Kyobu Geka 2008; 61:303-309. [PMID: 18411694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We assessed the effect of reconstructing the pulmonary artery during arterial switch surgery for transposition of the great arteries on late pulmonary stenosis. Sixty-five patients who underwent Lecompte procedure between September 1991 and December 2006 were divided, by the procedure used chronologically to reconstruct the pulmonary artery, into group XP (single pantaloon patch with equine pericardium, n = 11), group P (direct reconstruction, n = 47), and group AP (single pantaloon patch with fresh autopericardium, n = 7). Outcome and pulmonary stenosis on the most recent ultrasound cardiography (UCG) were compared in the 3 groups. The median follow-up was 13, 7.5, and 1.3 years, respectively. Both early and late mortalities were 1.5% (1/65). Although percutaneous trans-pulmonary angioplasty was necessary in 1, 13, and 3 patients, there was 1, 1, and 0 reoperation for pulmonary stenosis in the 3 groups, respectively. Pulmonary stenosis (pulmonary arterial maximum flow velocity > 3 m/sec on UCG) was present in 4 (40%). 14 (30%). and 3 patients (43%). Although there was no significant difference among the 3 procedures in preventing pulmonary stenosis 10 years after arterial switch surgery, direct reconstruction of the pulmonary artery may show a superior outcome, in particular, over 10 years after arterial switch surgery.
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Affiliation(s)
- Hiroaki Kawata
- Department of Cardiovascular Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health, Izumi, Japan
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41
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Hasegawa K, Okabe A, Kawada Y, Tsujimura N, Yashima T, Kobayashi N, Kondo S, Mori T, Okamoto S. 422: Efficacy of Mouth Rinses during Cytarabine Infusion in Preventing Oral Mucositis in the Recipients of Allogeneic Hematopoietic Stem Cell Transplantation Conditioned by High-dose Cytarabine and Total Body Irrradiation. Biol Blood Marrow Transplant 2008. [DOI: 10.1016/j.bbmt.2007.12.432] [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: 10/22/2022]
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43
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Kawada Y, Nakamura M, Ishida E, Shimada K, Oosterwijk E, Uemura H, Hirao Y, Chul KS, Konishi N. Aberrations of the p14(ARF) and p16(INK4a) genes in renal cell carcinomas. Jpn J Cancer Res 2001; 92:1293-9. [PMID: 11749694 PMCID: PMC5926680 DOI: 10.1111/j.1349-7006.2001.tb02152.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The INK4a / ARF locus on chromosome 9p21, which encodes two distinct genes, p14(ARF) and p16(INK4a), is frequently altered in human neoplasms. To investigate the potential roles of p14(ARF) and p16(INK4a) genes in human renal cell carcinomas (RCCs), we analyzed 6 human RCC cell lines and 91 primary RCCs for homozygous deletion, promoter hypermethylation and expression of the p14(ARF) and p16(INK4a) gene products using differential PCR, methylation-specific PCR, and immunohistochemistry, respectively. Five cell lines showed homozygous co-deletion of both genes and one demonstrated promoter hypermethylation of the p16(INK4a) gene only. Eight of 91 RCCs showed aberrations of p14(ARF) or p16(INK4a) status and six of these featured gross extension into the renal vein. The results suggest that p14(ARF) and p16(INK4a) aberrations may play roles in the relatively late stage of renal tumorigenesis associated with tumor progression.
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Affiliation(s)
- Y Kawada
- Second Department of Pathology, Nara Medical University, Kashihara, Nara 634-8521, Japan.
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44
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Cho M, Uemura H, Kim SC, Kawada Y, Yoshida K, Hirao Y, Konishi N, Saga S, Yoshikawa K. Hypomethylation of the MN/CA9 promoter and upregulated MN/CA9 expression in human renal cell carcinoma. Br J Cancer 2001; 85:563-7. [PMID: 11506497 PMCID: PMC2364093 DOI: 10.1054/bjoc.2001.1951] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
MN/CA9 is a cancer-related gene, frequently activated in human renal cell carcinomas (RCCs). To reveal the activation mechanism, we investigated the relationship between methylation status of the MN/CA9 promoter region and gene expression using 13 human RCCs, and examined the effect of in vitro CpG methylation on the MN/CA9 promoter activity using a human RCC cell line (SK-RC-44), expressing MN/CA9. MN/CA9 expression was evaluated by RT-PCR and observed in 10 of 13 RCCs (77%). A total of 9 out of 10 MN/CA9 -positive RCCs (90%) contained clear cell components. Methylation status of 6 CpGs in the MN/CA9 promoter region was decided by using the bisulfite genomic sequencing protocol. Out of 13 RCCs 9 (69%) showed partial hypomethylation of the CpG at -74 bp, while the other 4 RCCs and 3 normal kidney tissue samples showed complete methylation. Hypomethylation of the CpG at -74 bp was strongly correlated with MN/CA9 expression. Luciferase assay revealed that the MN/CA9 promoter activity was strongly suppressed by methylation of the CpG at -74 bp. These findings suggest that hypomethylation of the CpG at -74 bp in the MN/CA9 promoter region might play an important role in this gene activation of human RCC.
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Affiliation(s)
- M Cho
- Department of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522, Japan
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Abstract
BACKGROUND To determine the clinical significance of eosinophilia in growth-hormone (GH)-deficient children, a clinical study consisting of 72 children and adolescents (mean age 9 years and 6 months at diagnosis) with GH deficiency (GHD) was undertaken. Patients were treated with GH, along with supplementation for the combined deficiency in patients with multiple hormone deficiency. METHODS A complete blood count and hemogram with microscopic examination of a peripheral blood smear was performed. RESULTS Before treatment, differential eosinophil counts exceeded 5% in 30 subjects (41.7%) and absolute eosinophil counts were >350 /microL in 27 subjects (37.5%). Growth hormone therapy did not significantly affect eosinophil counts. There was an inverse relationship between absolute eosinophil count and peak GH value in response to the L-dopa stimulation test (n=65; Rs=-0.252; P=0.044). CONCLUSIONS For the diagnosis of GHD, one should take into account that GH response to L-dopa stimulation can be selectively blunted in patients with eosinophilia.
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Affiliation(s)
- Y Kawada
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan.
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46
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Konishi N, Nakamura M, Ishida E, Kawada Y, Nishimine M, Nagai H, Emi M. Specific genomic alterations in rat renal cell carcinomas induced by N-ethyl-N-hydroxyethylnitrosamine. Toxicol Pathol 2001; 29:232-6. [PMID: 11421490 DOI: 10.1080/019262301317052503] [Citation(s) in RCA: 3] [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] [Indexed: 10/17/2022]
Abstract
To characterize genetic alterations occurring in renal tumorigenesis, EHEN-induced renal cell tumors were examined using restriction landmark genomic scanning (RLGS) analysis, an electrophoretic separation technique that detects gene amplifications and deletions. Comparison of DNAs from tumor against those from corresponding nontumorous kidney and/or EHEN-treated kidney without development of renal tumors yielded specific alterations in terms of both amplified and reduced DNA spots. Two amplified spots were detected only in renal cell tumors and an additional four spots were frequent in EHEN-treated kidneys. One reduced spot was common to all tumor samples, and another was frequently detected in the tumors analyzed but not in EHEN-treated kidneys. A subset of the altered spots thus appeared to be specific for EHEN-induced renal tumorigenesis.
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Affiliation(s)
- N Konishi
- Second Department of Pathology, Nara Medical University, Kashihara, Japan.
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47
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Takao S, Kawada Y, Ogawa M, Fukuda S, Shimazu Y, Noda M, Tokumoto S. The first reported case of Japanese spotted fever in Hiroshima Prefecture, Japan. Jpn J Infect Dis 2000; 53:216-7. [PMID: 11135712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- S Takao
- Division of Microbiology II, Hiroshima Prefectural Institute of Health and Environment, Hiroshima 734-0007, Japan.
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48
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Yasuda M, Fukuda H, Yokoi S, Ishihara S, Kawada Y, Deguchi T. In vitro selection of fluoroquinolone-resistant Neisseria gonorrhoeae harboring alterations in DNA gyrase and topoisomerase IV. J Urol 2000; 164:847-51. [PMID: 10953166 DOI: 10.1097/00005392-200009010-00060] [Citation(s) in RCA: 3] [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] [Indexed: 11/25/2022]
Abstract
PURPOSE We attempted to select increasingly fluoroquinolone-resistant strains of Neisseria gonorrhoeae in vitro and to assess whether selected mutants harbored alterations in the GyrA subunit of DNA gyrase and the ParC subunit of DNA topoisomerase IV, which were analogous to those in fluoroquinolone-resistant clinical isolates. MATERIALS AND METHODS A fluoroquinolone-susceptible strain was exposed to norfloxacin in vitro. Selected mutants were sequentially exposed to norfloxacin, and this procedure was repeated. For 11 mutants, minimum inhibitory concentrations (MICs) of antimicrobial agents were determined, and mutations in the region corresponding to the quinolone resistance-determining region (QRDR) of the Escherichia coli gyrA gene and the analogous region of the parC gene were analyzed. RESULTS Mutants obtained in one step exhibited significantly increased MICs of norfloxacin, ofloxacin and ciprofloxacin and had a single amino acid change in GyrA. Two-step mutants exhibited significantly higher norfloxacin MICs. Three of four two-step selected strains had single amino acid changes in both GyrA and ParC. Three-step mutants exhibited further increases in fluoroquinolone MICs and were assigned to the ciprofloxacin-resistant category. Two had a double amino acid change in GyrA, and one had a double GyrA change and a single amino acid change in ParC. CONCLUSION We selected fluoroquinolone-resistant strains that carried GyrA and ParC alterations analogous to those in clinical isolates. The serial accumulation of changes in the QRDR of GyrA and the analogous region of ParC was associated with a stepwise increase in fluoroquinolone resistance, although the development of additional alterations in other regions of GyrA and ParC or other mechanisms of fluoroquinolone resistance also might contribute to the enhancement in fluoroquinolone resistance. The clinical emergence of fluoroquinolone-resistant strains may be due to in-vivo stepwise selection of strains with genetic alterations in GyrA and ParC, as observed here in the in-vitro selection of fluoroquinolone-resistant mutants.
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Affiliation(s)
- M Yasuda
- Department of Urology, Gifu University School of Medicine, Gifu, Japan
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Sugi K, Itaya N, Katsura T, Igi M, Yamazaki S, Ishibashi T, Yamaoka T, Kawada Y, Tagami Y, Otsuki M, Ohshima T. Improved synthesis of paroxetine hydrochloride propan-2-ol solvate through one of metabolites in humans, and characterization of the solvate crystals. Chem Pharm Bull (Tokyo) 2000; 48:529-36. [PMID: 10783073 DOI: 10.1248/cpb.48.529] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Paroxetine, a potent and selective inhibitor of 5-hydroxytryptamine (serotonin) uptake, was prepared through a piperidine derivative, which was reported to be one of the paroxetine metabolites in humans. Thus, the piperidine derivative was converted to its N-tert-butoxycarbonyl (N-Boc) derivative, which was then converted to N-Boc paroxetine. Paroxetine hydrochloride propan-2-ol (isopropyl alcohol (IPA)) solvate crystals were directly obtained from the N-Boc paroxetine by adding hydrogen chloride to the N-Boc paroxetine IPA solution. The amount of IPA content in the crystals was reduced by drying with a continuous change of powder X-ray diffraction patterns. Other characterizations of the solvate crystals were also conducted.
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Affiliation(s)
- K Sugi
- Central Research Laboratories, Sumika Fine Chemicals Co., Ltd., Osaka, Japan
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Deguchi T, Yamaha M, Nakano M, Yasuda M, Nishino Y, Ishihara S, Kawada Y. Development of a rapid assay for screening point mutations associated with quinolone resistance in the Pseudomonas aeruginosa parC gene. J Infect Chemother 2000; 6:26-9. [PMID: 11810527 DOI: 10.1007/s101560050045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/1999] [Accepted: 10/08/1999] [Indexed: 10/28/2022]
Abstract
To detect quinolone resistance-associated mutations within the Ser-80 and Glu-84 codons of the Pseudomonas aeruginosa parC gene, we developed a rapid and simple assay based on polymerase chain reaction (PCR) amplification of the region of the parC gene containing the mutation sites and digestion of the PCR products with a restriction enzyme. The mutations generating alterations at Ser-80 and Glu-84 were detected as restriction fragment length polymorphisms of the PCR products digested with HinfI. Among 22 clinical isolates tested by this assay, mutations at the Ser-80 and Glu-84 codons were detected in all 10 isolates in which the presence of the mutations had been confirmed previously by DNA sequencing. This rapid and simple assay could be a useful screening device for genetic alterations associated with resistance to quinolones in the P. aeruginosa parC gene.
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Affiliation(s)
- T Deguchi
- Department of Urology, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu 500-8705, Japan.
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