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Hirota N, Suzuki S, Arita T, Yagi N, Otsuka T, Yamashita T. Prediction of recurrence after catheter ablation for atrial fibrillation using left atrial morphology on preprocedural computed tomography: application of radiomics. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.597] [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
Radiomics is a comprehensive analysis methodology of medical image and involves the extraction of numerous features from standard imaging. Its usefulness has been reported mainly in the field of cancer for diagnosis and prediction of prognosis. In the territory of cardiac imaging, several reports have investigated the utility of radiomics for classifying the risk of prognosis in coronary artery disease, and few practical applications have been reported for patients with atrial fibrillation (AF) who underwent pulmonary vein isolation (PVI). Although the left atrial morphology can affect the clinical course after the PVI procedure, it is unclear whether the radiomics feature values of the left atrial morphology on cardiac computed tomography (CT) is useful for predicting the AF recurrence after PVI.
Purpose
To predict the recurrence of AF after PVI using the radiomics feature values of the left atrial morphology on cardiac computed tomography (CT).
Methods
We analyzed 525 consecutive three-dimensional cardiac CT in patients with atrial fibrillation who underwent PVI from 2018 to 2019 in our institute. After marking the region of interest on left atrium (including the root of pulmonary veins) semiautomatically, 107 radiomics feature values were obtained by Python program. After excluding the parameters having collinearity or with low predictive capability for the recurrence of AF after PVI, 42 parameters were applied to the final prediction model. Two prediction models were constructed by multivariate Cox regression analysis and machine learning model by support vector machine algorithm.
Results
The area under the curve (AUC) for predicting the recurrence of AF was 0.815 for the multivariate Cox regression model and 0.826 for the machine learning model by support vector machine.
Conclusion
The radiomics feature values on preprocedural cardiac CT could be helpful for predicting the recurrence of AF after PVI. Since radiomics feature analysis yields a huge number of numerical values representing the left atrial morphology in a reproducible manner, it would provide a new direction to construct a good prediction model using machine learning including artificial intelligence out of a routine cardiac CT scan.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- N Hirota
- Cardiovascular Institute Hospital , Tokyo , Japan
| | - S Suzuki
- Cardiovascular Institute Hospital , Tokyo , Japan
| | - T Arita
- Cardiovascular Institute Hospital , Tokyo , Japan
| | - N Yagi
- Cardiovascular Institute Hospital , Tokyo , Japan
| | - T Otsuka
- Cardiovascular Institute Hospital , Tokyo , Japan
| | - T Yamashita
- Cardiovascular Institute Hospital , Tokyo , Japan
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2
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Yagi N, Suzuki S, Hirota N, Arita T, Otuka T, Yamashita T. Prediction of persistent form of atrial fibrillation using left atrial morphology on preprocedural computed tomography: application of radiomics. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Radiomics is a comprehensive analysis methodology of medical image and involves the extraction of numerous features from standard imaging. Its usefulness has been reported mainly in the field of cancer for diagnosis and prediction of prognosis. In the territory of cardiac imaging, several reports have investigated the utility of radiomics for classifying the risk of prognosis in coronary artery disease, and few practical applications have been reported for patients with atrial fibrillation (AF) who underwent catheter ablation (CA).
Purpose
The objective of this study was to evaluate the utility of radiomics analysis applying to the preprocedural cardiac computerized tomography (CT) in AF patients.
Methods
We analyzed 525 consecutive three-dimensional CT in patients with AF who underwent CA. After marking the region of interest on left atrium (LA) (including the root of pulmonary veins) semiautomatically, 107 radiomics feature values were obtained by Python program. We calculated the amount of representative statistics for each radiomics feature for prediction of persistent AF (PeAF) (Wald statistic in logistic regression analysis) and LA diameter (LAD) (coefficient correlation), respectively. To compare the distribution of the two statistics, the relative importance (calculated as the ratio of statistic to the maximum statistics among 107 radiomics features [%]) was calculated for each statistic. Further, we compared the area under the curve (AUC) in receiver operation characteristic (ROC) curve analysis for predicting PeAF between radiomics features (multivariate model) and LAD (single parameter).
Results
In 525 study patients (age 63±10 years old and male 80%), 253 (48%) were PeAF and remaining were paroxysmal AF (PAF). LAD was 43±6 mm and 38±6 mm in patients with PeAF and PAF, respectively. The relative importance of the two statistics (Wald statistic for PeAF and coefficient correlation for LAD) of 107 radiomics features are displayed in Figure 1, which shows similar distribution of two statistics. It means the close relationship between LA morphology and the form of PeAF in AF patients and the radiomics features possibly well explain the relationship. In Figure 2, the predictive capability for PeAF was compared between radiomics feature values and LAD, where the AUC was 0.85 (95% confidence interval [CI], 0.82–0.88) and 0.73 (95% CI, 0.69–0.78) for radiomics feature values and LAD, respectively (Delong test, P<0.001).
Conclusion
We applied the radiomics features for the evaluation of LA morphology. The predictive capability for PeAF in the prediction model with the radiomics feature values was much better than that with LAD alone. Since radiomics feature analysis yields a huge number of numerical values representing the LA morphology in a reproducible manner, it would provide a new direction to construct a good prediction model using machine learning including artificial intelligence out of a routine cardiac CT scan.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- N Yagi
- Cardiovascular Institute , Tokyo , Japan
| | - S Suzuki
- Cardiovascular Institute , Tokyo , Japan
| | - N Hirota
- Cardiovascular Institute , Tokyo , Japan
| | - T Arita
- Cardiovascular Institute , Tokyo , Japan
| | - T Otuka
- Cardiovascular Institute , Tokyo , Japan
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3
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Tanaka O, Yagi N, Tawada M, Taniguchi T, Adachi K, Nakaya S, Makita C, Matsuo M. PO-1296 Hemostatic Radiotherapy for Gastric Cancer: Relationship Between MR Images and Tumor Markers. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03260-1] [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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4
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Suzuki S, Motogi J, Matsuzawa W, Takayanagi T, Umemoto T, Hirota N, Nakai H, Hyodo A, Satoh K, Otsuka T, Arita T, Yagi N, Yajima J, Yamashita T. Identifying patients with atrial fibrillation during sinus rhythm on ECG: confirming the utility of artificial intelligence algorithm in a small-scale cohort without structural heart diseases. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Detection of atrial fibrillation (AF) out of electrocardiograph (ECG) on sinus rhythm (SR) using artificial intelligence (AI) algorithm has been widely studied within recent couple of years. Generally, it is believed that a huge number of ECGs are necessary for developing an AI-enabled ECG to be adequate to correspond to a lot of minor variations of ECGs. For example, structural heart diseases have typical ECG characteristics, but they could be a noise for the purpose of detecting the small signs of electrocardiographic signature of AF. We hypothesized that when patients with structural heart diseases are excluded, AI-enabled ECG for identifying patients with AF can be developed with a small number of ECGs.
Methods
We developed an AI-enabled ECG using a convolutional neural network to detect the electrocardiographic signature of AF present during normal sinus rhythm (NSR) using a digital, standard 10-second, 12-lead ECGs. We included all patients who newly visited the Cardiovascular Institute with at least one NSR ECG between Feb 1, 2010, and March 31, 2018. We classified patients with at least one ECG with a rhythm of AF as positive for AF (AF label) and others as negative for AF (SR label). We allocated ECGs to the training, internal validation, and testing datasets in a 7:1:2 ratio. We calculated the area under the curve (AUC) of the receiver operating characteristic curve for the internal validation dataset to select a probability threshold, which we applied to the testing dataset. We evaluated model performance on the testing dataset by calculating the AUC and the sensitivity, specificity, F1 score, and accuracy with two-sided 95% confidence intervals (CIs).
Results
We totally included 19170 patients with 12-lead ECG. After excluding patients with structural heart diseases, 12825 patients with NSR ECGs at the initial visit were identified (1262 were clinically diagnosed as AF anytime during the time course and 11563 were never diagnosed as AF). Of 11563 non-AF patients, 1818 patients who were followed over 1095 days were selected for the analysis with the SR label, to secure the robustness for maintaining SR. Of 1262 AF patients, 251 patients were selected for the analysis with the AF label, of whom a NSR ECG within 31 days before or after the index AF ECG (the first AF ECG during the time course) could be obtained. In the patients with AF label, the NSR ECG of which the date was the nearest to the index AF ECG was selected for the analysis. The AI-enabled ECG showed an AUC of 0.88 (0.84–0.92) with sensitivity 81% (72–88), specificity 80% (77–83), F1 score 50% (43–57), and overall accuracy 80% (78–83).
Conclusion
An AI-enabled ECG acquired during NSR allowed identification of patients with AF in a small population without structural heart diseases.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- S Suzuki
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - J Motogi
- Nihon Kohden Corporation, Tokyo, Japan
| | | | | | - T Umemoto
- Nihon Kohden Corporation, Tokyo, Japan
| | - N Hirota
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - H Nakai
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - A Hyodo
- Nihon Kohden Corporation, Tokyo, Japan
| | - K Satoh
- Nihon Kohden Corporation, Tokyo, Japan
| | - T Otsuka
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - T Arita
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - N Yagi
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - J Yajima
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
| | - T Yamashita
- Cardiovascular Institute, Department of cardiovascular medicine, Tokyo, Japan
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5
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Yagi N, Seguchi O, Masanobu Y, Takuya W, Kensuke K, Seiko N, Hiroki M, Koichi Y, Yasumori S, Eiji A, Yoichi I, Shotaro K, Naoki T, Tetsuya S, Satsuki F, Tomoyuki F, Norihide F. Hypertrophic Cardiomyopathy with Left Ventricular Systolic Dysfunction: Clinical Outcome after Implantable Continuous-Flow Left Ventricular Assist Device Implantation. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.1134] [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] Open
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6
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Anegawa E, Seguchi O, Iwasaki Y, Komeyama S, Yoshitake K, Sujino Y, Yagi N, Mochizuki H, Kuroda K, Nakajima S, Watanabe T, Yanase M, Fukushima S, Fujita T, Fukushima N. Pulmonary Vascular Reverse Remodeling in Combined Post and Pre Capillary Pulmonary Hypertension Occurs Over Time after Left Ventricular Assist Device Implantation. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.323] [Citation(s) in RCA: 1] [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: 11/30/2022] Open
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7
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Hirota N, Suzuki S, Arita T, Yagi N, Otsuka T, Semba H, Kano H, Matsuno S, Kato Y, Uejima T, Oikawa Y, Yajima J, Yamashita T. Prediction of atrial fibrillation by 12-lead electrocardiogram parameters in patients without structural heart disease. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0536] [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
Recently, the analysis of electrocardiogram (ECG) waveform by artificial intelligence has been reported to pick out those who have atrial fibrillation (AF) or have a high potential of developing AF, which, however, cannot explain the mechanisms or algorisms for the prediction from its nature.
Purpose
The purpose of this study is to conduct a comprehensive analysis to investigate the difference of weighting in predicting capability for AF among hundreds of automatically-measured ECG parameters using a single ECG at sinus rhythm.
Methods and results
Out of Shinken Database 2010–2017 (n=19170), 12825 patients were extracted, where those with ECG showing AF rhythm at the initial visit (including all persistent/permanent AF and a part of paroxysmal AF) and those with structural heart diseases were excluded. Out of 639 automatically-measured ECG parameters in MUSE data management system (GE Healthcare, USA), 438 were used. [Analysis 1] A predicting model for paroxysmal AF were determined by logistic regression analysis (Total, n=12825; paroxysmal AF, n=1138), showing a high predictive capability (AUC = 0.780, p<0.001). In this model, the relative contribution of ECG parameters (by coefficient of determination) according to the time phase were P:72.4%, QRS:32.7%, and ST-T:13.7%, respectively (Figure A). [Analysis 2] Excluding AF at baseline, a predicting model for new-developed AF were determined by Cox regression analysis (Total, n=11687; new-developed AF, n=87), showing a high predictive capability (AUC = 0.887, p<0.001). In this model, the relative contribution of parameters (by log likelihood) according to the time phase were P:40.8%, QRS:42.5%, and ST-T:24.9%, respectively (Figure B).
Conclusions
We determined ECG parameters that potentially contribute to picking up existing AF or predicting future development of AF, where the measurement of P wave strongly contributed in the former whereas all time phases were similarly important in the latter.
Weighting of parameters to predict AF
Funding Acknowledgement
Type of funding source: Private hospital(s). Main funding source(s): Self funding of the institute
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Affiliation(s)
- N Hirota
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - S Suzuki
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - T Arita
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - N Yagi
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - T Otsuka
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - H Semba
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - H Kano
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - S Matsuno
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - Y Kato
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - T Uejima
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - Y Oikawa
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - J Yajima
- Cardiovascular Institute Hospital, Tokyo, Japan
| | - T Yamashita
- Cardiovascular Institute Hospital, Tokyo, Japan
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8
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Kato Y, Itahashi N, Uejima T, Semba H, Arita T, Yagi N, Suzuki S, Otsuka T, Kishi M, Kanou H, Matsuno S, Oikawa Y, Yajima J, Yamashita T. Heart rate recovery after exercise as a prognostic predictor in patients with atrial fibrillation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0496] [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
A delayed heart rate recovery (HRR) after exercise is related to mortality in sinus rhythm. This study aimed to investigate this concept can be applied to patients with atrial fibrillation (AF).
Methods
We analyzed 483 patients with AF (mean 65 years, male 74%). HRR integral was calculated by integrating the difference in HR in every 3 second between the end of exercise and the specified time after the exercise (30, 60, 120 and 180 seconds). After evaluating the prognostic power of each HRR integral, we selected HRR integral of 180 seconds (180HRR-integral).
Results
We divided the patients into two groups using median value of 180HRR-integral. All-cause mortality, the incidence of cardiovascular events and heart failure events were higher in the poor 180HRR-integral. After adjustment for covariates, the impact of the high 180HRR-integral for all-cause mortality was 3.15 (p=0.057), 1.77 for cardiovascular events (p=0.067) and 1.28 for heart failure events (p=0.519).
Conclusion
Poor HRR was associated with worse prognosis in patients with AF.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Kato
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - N Itahashi
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - T Uejima
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - H Semba
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - T Arita
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - N Yagi
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - S Suzuki
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - T Otsuka
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - M Kishi
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - H Kanou
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - S Matsuno
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - Y Oikawa
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - J Yajima
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
| | - T Yamashita
- The Cardiovascular Institute, Cardiology, Tokyo, Japan
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9
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Yagi N, Nakagami T, Yamaguchi S, Hamaoka T, Fukai K. Novel method for endovascular fenestration using radiofrequency transseptal needle for aortic dissection with malperfusion syndrome. Radiol Case Rep 2020; 15:1437-1441. [PMID: 32642013 PMCID: PMC7334550 DOI: 10.1016/j.radcr.2020.06.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/04/2020] [Accepted: 06/04/2020] [Indexed: 12/02/2022] Open
Abstract
Malperfusion syndrome is considered one of the most significant adverse events in aortic dissection disease and often requires invasive strategies to improve ischemia. We report the case of a patient who was presented with worsening claudication and leg rest pain due to malperfusion syndrome of type B aortic dissection. We successfully performed endovascular fenestration therapy to relieve the symptom by using a NRG radiofrequency transseptal needle (Baylis Medical, Montreal, Canada). We suggest that this novel method would be available for the patients with malperfusion syndrome of aortic dissection
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Affiliation(s)
- N Yagi
- Department of Cardiovascular Medicine, University Hospital, Kyoto Prefectural University of Medicine, 465 Kaji-cho, Kamigyo-ku, Kyoto-shi, Kyoto, 602-8566, Japan.,Department of Cardiovascular Medicine, Omihachiman Community Medical Center, 1379 Tsuchidacho, Omihachiman, Shiga, 523-0082, Japan
| | - T Nakagami
- Department of Cardiovascular Medicine, Omihachiman Community Medical Center, 1379 Tsuchidacho, Omihachiman, Shiga, 523-0082, Japan
| | - S Yamaguchi
- Department of Cardiovascular Medicine, Omihachiman Community Medical Center, 1379 Tsuchidacho, Omihachiman, Shiga, 523-0082, Japan
| | - T Hamaoka
- Department of Cardiovascular Medicine, Omihachiman Community Medical Center, 1379 Tsuchidacho, Omihachiman, Shiga, 523-0082, Japan
| | - K Fukai
- Department of Cardiovascular Medicine, Omihachiman Community Medical Center, 1379 Tsuchidacho, Omihachiman, Shiga, 523-0082, Japan
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10
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Takeuchi S, Watanabe T, Anegawa E, Sujino Y, Yagi N, Yoshitake K, Mochizuki H, Iwasaki K, Nakajima S, Kuroda K, Seguchi O, Yanase M, Tadokoro N, Yajima S, Fukushima S, Fujita T, Ogawa H, Fukushima N. The Development of Cardiac Allograft Vasculopathy Occurs in Early Intimal Thickening and Constrictive Remodeling in Long-Term Period; Long-Term Serial Intravascular Ultrasound Study. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.532] [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: 10/24/2022] Open
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11
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Watanabe T, Yanase M, Fujita T, Fukushima S, Nakajima S, Kuroda K, Iwasaki K, Yajima S, Tadokoro N, Mochizuki H, Anegawa E, Sujino Y, Yagi N, Yoshitake K, Kobayashi J, Fukushima N. Donor-Transmitted Atherosclerosis and the Occurrence of Cardiac Antibody-Mediated Rejection Influenced on the Development of Cardiac Allograft Vasculopathy. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.537] [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: 10/24/2022] Open
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12
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Iwasaki K, Yoshitake K, Yagi N, Sujino Y, Anegawa E, Mochizuki H, Kuroda K, Nakajima S, Watanabe T, Seguchi O, Yanase M, Fukushima S, Fujita T, Kobayashi J, Fukushima N. Incidence, Factors and Prognostic Impact of Re-Exploration for Bleedings after Continuous Flow Left Ventricular Assist Device Implantation. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.520] [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: 10/24/2022] Open
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13
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Tsukube T, Yokawa K, Okita Y, Ataka K, Hoshino M, Yagi N. P1782Synchrotron-based 4D-X-ray Phase Tomography of fresh chordae tendineae of mitral valve. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0534] [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
Mechanical properties of chordae tendineae of mitral valve (MV) are still not fully investigated. Synchrotron-based X-ray phase tomography (XPCT) is a powerful tool to measure biological soft tissues. Recently, we have developed dynamic X-ray phase tomography (4D-XPCT) to discuss the dynamic phenomena of biological samples quantitatively and applied to chordae tendineae of MV (MVCT).
Purpose
This study evaluated 4-dimensional changes of MVCT and clarified structural changes of MVCT during cardiac cycles.
Methods
The X-ray energy for 4D XPCT was set to 20keV. The effective pixel size was 7.8μm. Fresh MVCT extracted from a pig heart were measured in the specially designed container filled with normal cold saline. MVCT installed on the sample stage was stretched and released with a continuous oscillation of 0.5Hz during a phase tomographic measurement. The amount of stretch was 400μm where a mechanical load caused by stretching was approximately 1N. In this measurement, projection images were acquired with a frame rate of 20Hz during a single sawtooth wave. Therefore, apparent frame rate of 20Hz is expected in 4D phase tomography. Cross section was determined by simple thresholding based on the density. In this case, the threshold was set to 1.018g/cm3.
Results
X-ray phase tomographic images of MVCT at the released (A) and stretched (B) conditions are shown in Fig. 1a. The load applied to the sample and change of the cross section obtained from tomography during stretching and releasing are shown in Fig. 1b and 1c, respectively. The diameter of chordae tendinea were changed approximately 2.5% during stretching and returned to initial diameter during releasing.
Figure 1
Conclusions
This result demonstrated that the 4D-XPCT had a capability to trace the detail of deformation process in the biological soft tissues during continuous oscillation. Even chordae tendinea are mainly consisted of collagen fibers, diameter of the chordae was changed according to stretching and releasing.
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Affiliation(s)
- T Tsukube
- Japanese Red Cross Kobe Hospital & Hyogo Emergency Medical Center, Kobe, Japan
| | - K Yokawa
- Kobe University, Cardiovascular Surgery, Kobe, Japan
| | - Y Okita
- Takatsuki General Hospital, Cardiovascular Surgery, Takatsuki, Japan
| | - K Ataka
- Sumitomo Hospital, Cardiovascular Surgery, Osaka, Japan
| | - M Hoshino
- Japan Synchrotron Radiation Res Institute SPring-8, Division of Researc Utilization, Sayo, Japan
| | - N Yagi
- Japan Synchrotron Radiation Res Institute SPring-8, Division of Researc Utilization, Sayo, Japan
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14
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Urata R, Ikeda K, Nakagawa T, Hoshino A, Honda S, Yagi N, Emoto N, Matoba S. P4500Cellular senescence of endothelial cells impairs angiogenesis by altering energy metabolism through p53-tigar axis. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Ischemic disease is prevalent in elderly population due to impaired angiogenesis. Endothelial cell (EC) generates energy largely via glycolysis, which is further activated when angiogenesis actively occurs. PFK-1 is one of the most important regulatory enzymes for glycolysis, which is activated by PFKFB3. On the other hand, TIGAR inhibits PFK-1 under the control of p53. Crucial roles of PFKFB3 in EC functions under physiological and pathological conditions have been reported; however, a role of TIGAR in EC angiogenic functions remains to be elucidated. Furthermore, it remains unknown whether and how cellular senescence affect the energy metabolism in EC.
Purpose
The purpose of this study is to investigate molecular mechanisms underlying EC dysfunction associated with ageing, especially by focusing on endothelial energy metabolism.
Method and result
Senescent EC showed reduced glucose consumption assessed by [U-13C]-glucose tracer assay in association with increased expression of p53 and TIGAR. Angiogenic capacity assessed by tube-formation assay was reduced in senescent EC. Of note, either silencing of TIGAR by siRNA or lentivirus-mediated overexpression of PFKFB3 improved angiogenic capacity in senescent EC. These results collectively suggest that senescence impairs glycolysis in EC by activating p53-TIGAR axis, which leads to senescence-associated endothelial dysfunction. To analyze an impact of EC senescence in angiogenesis in vivo, we generated EC-specific progeroid mice in which dominant negative form of telomere repeat-binding factor 2 (TRF2) was overexpressed in EC under the control of the TIE2 promoter. After confirming EC-specific senescence in these endothelial progeroid mice, we generated hind-limb ischemia model. Recovery of blood flow assessed by laser doppler velocimeter was significantly impaired in endothelial progeroid mice, indicating that EC senescence is directly and causally implicated in age-related angiogenic dysfunction. Of note, genetic inactivation of TIGAR completely rescued the impaired ischemia-induced neovessel formation in EC-specific progeroid mice.
Conclusion
Using unique endothelial progeroid mice, we revealed that EC senescence is a bona fide risk for ischemic disease, largely by reducing glycolysis in EC through p53-TIGAR axis. Our data suggest that endothelial energy metabolism is an attracting therapeutic target for the prevention and/or treatment of ischemic diseases, especially in elderly population.
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Affiliation(s)
- R Urata
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - K Ikeda
- Kobe Pharmaceutical University, Laboratory of Clinical Pharmaceutical Science, Kobe, Japan
| | - T Nakagawa
- University of Toyama, Department of Metabolism and Nutrition, Toyama, Japan
| | - A Hoshino
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Honda
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Yagi
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Emoto
- Kobe Pharmaceutical University, Laboratory of Clinical Pharmaceutical Science, Kobe, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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Ishigaki T, Asanuma T, Yagi N, Izumi H, Shimizu S, Fujisawa Y, Miyahira Y, Kushima R, Masuda K, Nakatani S. 2231Improvement in diagnostic accuracy of single-vessel coronary stenosis by the analysis of post-systolic shortening derived from non-stress speckle tracking echocardiography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.2231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T Ishigaki
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - T Asanuma
- Osaka University Graduate School of Medicine, Department of Health Sciences, Division of Functional Diagnostics, Suita, Japan
| | - N Yagi
- Shiga University of Medical Science, Department of Cardiovascular Medicine, Otsu, Japan
| | - H Izumi
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - S Shimizu
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - Y Fujisawa
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - Y Miyahira
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - R Kushima
- Shiga University of Medical Science, Department of Clinical Laboratory Medicine, Otsu, Japan
| | - K Masuda
- Osaka University Graduate School of Medicine, Department of Health Sciences, Division of Functional Diagnostics, Suita, Japan
| | - S Nakatani
- Osaka University Graduate School of Medicine, Department of Health Sciences, Division of Functional Diagnostics, Suita, Japan
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Hirata K, Wake M, Takahashi T, Yagi N, Nakazato J, Miyagi T, Tomishima Y, Tengan T, Yasumoto H, Nakasu A, Ishimine T, Mototake H. P1597Incidence, clinical pictures and risk factors for bioprosthetic tricuspid valve stenosis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1597] [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)
- K Hirata
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - M Wake
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - T Takahashi
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - N Yagi
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - J Nakazato
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - T Miyagi
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - Y Tomishima
- Okinawa Chubu Hospital, Cardiology, Uruma, Japan
| | - T Tengan
- Okinawa Chubu Hospital, Cardiovascular Surgery, Uruma, Japan
| | - H Yasumoto
- Okinawa Chubu Hospital, Cardiovascular Surgery, Uruma, Japan
| | - A Nakasu
- Okinawa Chubu Hospital, Cardiovascular Surgery, Uruma, Japan
| | - T Ishimine
- Okinawa Chubu Hospital, Cardiovascular Surgery, Uruma, Japan
| | - H Mototake
- Okinawa Chubu Hospital, Cardiovascular Surgery, Uruma, Japan
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Imai N, Shota I, Horiuchi K, Tasaki A, Yagi N, Konishi T, Serizawa M, Kobari M. Comparison of resting-state functional connectivity between women with chronic migraine and those with episodic migraine. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.510] [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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Hirao S, Masumoto H, Hoshino M, Minakata K, Takimoto S, Ikeda T, Yamashita J, Yagi N, Minatoya K. P3352Three-dimensional histological analysis of cardiac tissue in experimental small animals by synchrotron radiation-based X-ray phase-contrast imaging at SPring-8. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kuroda R, Nakada T, Ojima T, Serizawa M, Imai N, Yagi N, Tasaki A, Aoki M, Oiwa T, Ogane T, Mochizuki K, Kobari M, Miyajima H. The TriAGe+ Score for Vertigo or Dizziness: A Diagnostic Model for Stroke in the Emergency Department. J Stroke Cerebrovasc Dis 2017; 26:1144-1153. [PMID: 28256416 DOI: 10.1016/j.jstrokecerebrovasdis.2017.01.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 09/13/2016] [Revised: 12/13/2016] [Accepted: 01/13/2017] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Vertigo or dizziness is a common occurrence, but it remains a challenging symptom when encountered in the emergency department (ED). A diagnostic score for stroke with high accuracy is therefore required. METHODS A single-center observational study (498 patients) was conducted. The predictor variables were derived from a multivariate logistic regression analysis with Akaike information criterion. The outcome was the occurrence of stroke. We evaluated the utility of a new diagnostic score (TriAGe+) and compared it with the ABCD2 score. RESULTS The cohorts included 498 patients (147 with stroke [29.4%]). Eight variables were included: triggers, atrial fibrillation, male gender, blood pressure ≥140/90 mm Hg, brainstem or cerebellar dysfunction, focal weakness or speech impairment, dizziness, and no history of vertigo or dizziness or labyrinth or vestibular disease. We derived the TriAGe+ score from these variables. In the cohort, the prevalence of stroke increased significantly using the diagnostic score: 5.9% for a score of 0-4; 9.1% for 5-7; 24.7% for 8-9; and 57.3% for 10-17. At a cutoff value of 10 points, the sensitivity of the score was 77.5%, the specificity was 72.1%, and the positive likelihood ratio was 3.2. When the cutoff was defined as 5 points, the score obtained a high sensitivity (96.6%) with a good negative likelihood ratio (.15). The new score outperformed the ABCD2 score for the occurrence of stroke (C statistic, .818 versus .726; P < .001). CONCLUSIONS The TriAGe+ score can identify the occurrence of stroke in patients with vertigo or dizziness presenting to the ED.
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Affiliation(s)
- R Kuroda
- Department of Neurology, Hamamatsu University School of Medicine, Shizuoka, Japan.
| | - T Nakada
- Critical Care Medical Center, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - T Ojima
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - M Serizawa
- Department of Neurology, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - N Imai
- Department of Neurology, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - N Yagi
- Department of Neurology, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - A Tasaki
- Departments of Neurology, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - M Aoki
- Critical Care Medical Center, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - T Oiwa
- Critical Care Medical Center, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - T Ogane
- Critical Care Medical Center, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - K Mochizuki
- Critical Care Medical Center, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - M Kobari
- Department of Neurology, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan
| | - H Miyajima
- Department of Neurology, Hamamatsu University School of Medicine, Shizuoka, Japan
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Matsushita T, Mizumaki K, Kano M, Yagi N, Tennichi M, Takeuchi A, Okamoto Y, Hamaguchi Y, Murakami A, Hasegawa M, Kuwana M, Fujimoto M, Takehara K. Antimelanoma differentiation-associated protein 5 antibody level is a novel tool for monitoring disease activity in rapidly progressive interstitial lung disease with dermatomyositis. Br J Dermatol 2017; 176:395-402. [PMID: 27452897 DOI: 10.1111/bjd.14882] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Antimelanoma differentiation-associated protein (anti-MDA)5 antibodies are associated with rapidly progressive interstitial lung disease (RP-ILD) in patients with clinically amyopathic dermatomyositis (CADM) or dermatomyositis (DM). OBJECTIVES We aimed to evaluate the relevance of monitoring anti-MDA5 antibody levels for the management of RP-ILD in patients with CADM or DM. METHODS Twelve patients with CADM (n = 10) or DM (n = 2) accompanied by RP-ILD were included. Baseline characteristics and outcomes were recorded. Serial measurements of anti-MDA5 antibody levels were measured. All patients were treated with corticosteroids, tacrolimus and intravenous cyclophosphamide. RESULTS All patients achieved RP-ILD remission after combined immunosuppressive therapy for a mean of 6·8 months, with significant decreases noted in the mean anti-MDA5 antibody levels at remission. Six (50%) patients became anti-MDA5 antibody negative after therapy. After a mean follow-up of 31 months, RP-ILD relapse was observed in four (33%) patients in both the anti-MDA5 antibody sustained positive group and the negative conversion group. However, relapsed patients in the sustained positive group relapsed earlier than those in the negative conversion group. Thus, a decrease in anti-MDA5 antibody levels during remission was associated with longer remission. Relapses were associated with a reincrease of anti-MDA5 antibody levels in four of four (100%) patients. In contrast, none of the patients without reincrease in anti-MDA5 antibody exhibited symptoms of relapse during follow-up. Therefore, reincrease in anti-MDA5 antibody levels was associated with relapse. CONCLUSIONS The anti-MDA5 antibody level is a novel parameter for monitoring and a good predictor of RP-ILD relapse in patients with CADM or DM.
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Affiliation(s)
- T Matsushita
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - K Mizumaki
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - M Kano
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - N Yagi
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - M Tennichi
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - A Takeuchi
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - Y Okamoto
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - Y Hamaguchi
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | - A Murakami
- Medical and Biological Laboratories Co., Ltd, Nagoya, 460-0008, Japan
| | - M Hasegawa
- Department of Dermatology, University of Fukui, Fukui, 910-1193, Japan
| | - M Kuwana
- Department of Allergy and Rheumatology, Nippon Medical School, Graduate School of Medicine, Tokyo, 113-8603, Japan
| | - M Fujimoto
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tennodai, Tsukuba, 305-8575, Japan
| | - K Takehara
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
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Pierscionek B, Bahrami M, Hoshino M, Regini J, Uesugi K, Yagi N. Optical properties of the lens: an explanation for the zones of discontinuity. Acta Ophthalmol 2016. [DOI: 10.1111/j.1755-3768.2016.0011] [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: 11/28/2022]
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Hayashibe M, Homma T, Fujimoto K, Oi T, Yagi N, Kashihara M, Nishikawa N, Ishizumi Y, Abe S, Hashimoto H, Kanekiyo K, Imagita H, Ide C, Morioka S. Locomotor improvement of spinal cord-injured rats through treadmill training by forced plantar placement of hind paws. Spinal Cord 2015; 54:521-9. [PMID: 26481711 DOI: 10.1038/sc.2015.186] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 08/26/2015] [Accepted: 09/04/2015] [Indexed: 01/06/2023]
Abstract
STUDY DESIGN Experimental training model of rats with spinal cord injury (SCI). SETTING Osaka, JapanObjective:To investigate the effect of forced treadmill training by plantar placement (PP), as compared with dorsal placement (DP), of the dorsal paws on the locomotor behaviors of spinal cord-injured rats. METHODS The spinal cord was contusion-injured at the thoracic level. Rats were divided into three groups: forced training involving stepping by PP and DP and non-forced training/assistance (nT). Training began 1 week after injury and was conducted for 4 weeks. Locomotor behaviors were estimated using Basso-Beattie-Bresnahan (BBB) scores, dorsiflexion of the hind paws and footprints of the hind paws. Histological and immunohistochemical examinations of the spinal cord lesions were conducted after 4 weeks of training. RESULTS The values, respectively, of PP, DP and nT groups at 4 weeks of training were as follows: BBB scores were 15.6±0.8, 7.7±1.3 and 10.3±0.4. The paw dorsiflexion angles were 34.1±5.2, 16.4±2.4 and 23.6±3.0 degrees, respectively. The stride angles were 5.1±0.9, 13.7±4.9 and 17.8±4.0 degrees for the left paws. Cavity volumes were 10.3±2.1, 31.0±2.0 and 28.2±4.9%. In addition to cavities, there were astrocyte-devoid areas containing some loose tissues, through which many axons extended longitudinally. CONCLUSIONS The BBB score, dorsiflexion angle and stride angle were consistently improved in the PP group. Cavity formation was more reduced, and many axons extended through coarse tissues formed in astrocyte-devoid areas at the lesion in the PP group. Forced training by PP of the hind paws promoted the behavioral and histological improvement of rats with SCI.
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Affiliation(s)
- M Hayashibe
- Department of Occupational Therapy, Aino University School of Health Sciences, Osaka, Japan.,Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, Nara, Japan
| | - T Homma
- Institute of Regeneration and Rehabilitation, Aino University School of Health Sciences, Osaka, Japan
| | - K Fujimoto
- Institute of Regeneration and Rehabilitation, Aino University School of Health Sciences, Osaka, Japan
| | - T Oi
- Department of General Education, Wakayama University, Wakayama, Japan
| | - N Yagi
- Department of Rehabilitation, Takatsuki Red Cross Hospital, Osaka, Japan
| | - M Kashihara
- Department of Rehabilitation, Kyoto Kaisei Hospital, Kyoto, Japan
| | - N Nishikawa
- Department of Rehabilitation, Kyoto Kaisei Hospital, Kyoto, Japan
| | - Y Ishizumi
- Department of Rehabilitation, North Osaka Police Hospital, Osaka, Japan
| | - S Abe
- Department of Occupational Therapy, Aino University School of Health Sciences, Osaka, Japan
| | - H Hashimoto
- Department of Occupational Therapy, Aino University School of Health Sciences, Osaka, Japan
| | - K Kanekiyo
- Institute of Regeneration and Rehabilitation, Aino University School of Health Sciences, Osaka, Japan
| | - H Imagita
- Department of Exercise and Functional Physiology, Graduate School of Health Sciences, Kio University, Nara, Japan
| | - C Ide
- Institute of Regeneration and Rehabilitation, Aino University School of Health Sciences, Osaka, Japan
| | - S Morioka
- Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, Nara, Japan
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Takeuchi T, Okada K, Yoshida H, Yagi N. THU0409 Post-Marketing Survey of Mizoribine for Lupus Nephritis (Mile 2010 Study Interim Analysis). Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.3275] [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: 11/03/2022]
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Kawamura H, Nishigami T, Matsuya A, Tsujishita M, Yagi N, Kawakatsu K. Effects of transcutaneous electrical nerve stimulation administered at contralateral site in the same dermatome. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.3594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Corpeno R, Dworkin B, Cacciani N, Salah H, Bergman HM, Ravara B, Vitadello M, Gorza L, Gustafson AM, Hedström Y, Petersson J, Feng HZ, Jin JP, Iwamoto H, Yagi N, Artemenko K, Bergquist J, Larsson L. Time course analysis of mechanical ventilation-induced diaphragm contractile muscle dysfunction in the rat. J Physiol 2014; 592:3859-80. [PMID: 25015920 DOI: 10.1113/jphysiol.2014.277962] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Controlled mechanical ventilation (CMV) plays a key role in triggering the impaired diaphragm muscle function and the concomitant delayed weaning from the respirator in critically ill intensive care unit (ICU) patients. To date, experimental and clinical studies have primarily focused on early effects on the diaphragm by CMV, or at specific time points. To improve our understanding of the mechanisms underlying the impaired diaphragm muscle function in response to mechanical ventilation, we have performed time-resolved analyses between 6 h and 14 days using an experimental rat ICU model allowing detailed studies of the diaphragm in response to long-term CMV. A rapid and early decline in maximum muscle fibre force and preceding muscle fibre atrophy was observed in the diaphragm in response to CMV, resulting in an 85% reduction in residual diaphragm fibre function after 9-14 days of CMV. A modest loss of contractile proteins was observed and linked to an early activation of the ubiquitin proteasome pathway, myosin:actin ratios were not affected and the transcriptional regulation of myosin isoforms did not show any dramatic changes during the observation period. Furthermore, small angle X-ray diffraction analyses demonstrate that myosin can bind to actin in an ATP-dependent manner even after 9-14 days of exposure to CMV. Thus, quantitative changes in muscle fibre size and contractile proteins are not the dominating factors underlying the dramatic decline in diaphragm muscle function in response to CMV, in contrast to earlier observations in limb muscles. The observed early loss of subsarcolemmal neuronal nitric oxide synthase activity, onset of oxidative stress, intracellular lipid accumulation and post-translational protein modifications strongly argue for significant qualitative changes in contractile proteins causing the severely impaired residual function in diaphragm fibres after long-term mechanical ventilation. For the first time, the present study demonstrates novel changes in the diaphragm structure/function and underlying mechanisms at the gene, protein and cellular levels in response to CMV at a high temporal resolution ranging from 6 h to 14 days.
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Affiliation(s)
- R Corpeno
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - B Dworkin
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - N Cacciani
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - H Salah
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - H-M Bergman
- Department of Chemistry-Biomedical Center, Analytical Chemistry and SciLifeLab, Uppsala University, Sweden
| | - B Ravara
- Department of Biomedical Sciences, University of Padova, Italy
| | - M Vitadello
- Department of Biomedical Sciences, University of Padova, Italy CNR-Institute of Neuroscience, Padova section, Italy
| | - L Gorza
- Department of Biomedical Sciences, University of Padova, Italy
| | - A-M Gustafson
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden
| | - Y Hedström
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - J Petersson
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden
| | - H-Z Feng
- Department of Physiology, Wayne State University, Detroit, MI, USA
| | - J-P Jin
- Department of Physiology, Wayne State University, Detroit, MI, USA
| | - H Iwamoto
- Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, Japan
| | - N Yagi
- Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, Japan
| | - K Artemenko
- Department of Chemistry-Biomedical Center, Analytical Chemistry and SciLifeLab, Uppsala University, Sweden
| | - J Bergquist
- Department of Chemistry-Biomedical Center, Analytical Chemistry and SciLifeLab, Uppsala University, Sweden
| | - L Larsson
- Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Sweden Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
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Yoshida N, Yagi N, Inada Y, Kugai M, Naito Y. Preventing Complications at Endoscopic Submucosal Dissection for Colorectal Neoplasia. Video Journal and Encyclopedia of GI Endoscopy 2013; 1:397-398. [DOI: 10.1016/s2212-0971(13)70176-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/11/2023]
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Dohi O, Yagi N, Wada T, Yamada N, Bito N, Yamada S, Gen Y, Yoshida N, Uchiyama K, Ishikawa T, Takagi T, Handa O, Konishi H, Wakabayashi N, Kokura S, Naito Y, Yoshikawa T. Recognition of endoscopic diagnosis in differentiated-type early gastric cancer by flexible spectral imaging color enhancement with indigo carmine. Digestion 2013; 86:161-70. [PMID: 22889937 DOI: 10.1159/000339878] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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] [Received: 01/09/2012] [Accepted: 06/05/2012] [Indexed: 02/04/2023]
Abstract
BACKGROUND/AIMS To evaluate the usefulness of flexible spectral imaging color enhancement with indigo carmine (I-FICE) in early gastric cancer (EGC) demarcation. METHODS The study participants were 29 patients with differentiated-type EGC. The endoscope was fixed and images of the same area of EGC demarcations in each lesion were obtained using four different methods (WLE, flexible spectral imaging color enhancement (FICE), CE, and I-FICE). FICE mode at R 550 nm (Gain: 2), G 500 nm (Gain: 4), and B 470 nm (Gain: 4) was used. Four endoscopists ranked the images obtained by each method on the basis of the ease of recognition of demarcation using a 4-point system. We calculated the standard deviation of pixel values based on L*, a*, and b* color spaces in the demarcation region (Lab-SD score). RESULTS The median ranking score for I-FICE images was significantly higher than that obtained from the other methods. Further, the average Lab-SD score was significantly higher for I-FICE images than for images obtained by the other methods. There was a good correlation between the ranking score and Lab-SD score. CONCLUSION EGC demarcations were most easily recognized both subjectively and objectively using I-FICE image, followed by CE, FICE and WLE images.
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Affiliation(s)
- O Dohi
- Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
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Waddingham M, Edgley A, Astolfo A, Inagaki T, Tsuchimochi H, Kelly D, Yagi N, Shirai M, Pearson J. Rho Kinase Inhibition Improves Cross Bridge Cycling In Early Diabetic Heart Disease. Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.490] [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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Ogawa K, Takahashi K, Asato Y, Yamamoto Y, Taira K, Matori S, Iraha S, Yagi N, Yogi A, Haranaga S, Fujita J, Uezato H, Murayama S. Treatment and prognosis of angiosarcoma of the scalp and face: a retrospective analysis of 48 patients. Br J Radiol 2012; 85:e1127-33. [PMID: 22806620 DOI: 10.1259/bjr/31655219] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
OBJECTIVE The objective of this study was to retrospectively analyse the treatment results of clinically localised angiosarcoma of the scalp and face. METHODS The records of 48 patients who were treated between 1987 and 2009 were reviewed. single modality or a combination of surgery, radiotherapy, chemotherapy and immunotherapy were administered. The median follow-up of all 48 patients was 13.7 months (range 2.5-105.9 months). RESULTS At the time of analysis, 45 of 48 patients (93.8%) had disease recurrences, and the lung was the most frequent site for recurrence (37 patients). In multivariate analysis, performance status (PS) and number of tumours were significant predictors of lung-metastasis-free (LMF) rate. For patients with multifocal tumours, chemotherapy use significantly decreased the LMF rate (p=0.0072). The 2-year actuarial overall survival (OS), progression-free survival and local control rates in all 48 patients were 22.1%, 10.7% and 46.3%, respectively. In multivariate analysis, PS, number of tumours, surgery and radiotherapy were significant prognostic factors for OS. Patients treated with both surgery and radiotherapy (2-year OS: 45.8%) had a significantly more favourable OS (p<0.0001) than patients treated with either surgery or radiotherapy (2-year OS: 11.1%) and patients treated with neither surgery nor radiotherapy (2-year OS: 0%). CONCLUSIONS Our results indicated that PS and number of tumours were significant predictors for developing lung metastases. Our results also indicated that PS, number of tumours, surgery use and radiotherapy use were independent prognostic factors for OS. Multimodal treatments including surgery and radiotherapy were effective in improving OS for patients with these tumours. Advances in knowledge Multimodal treatments including surgery and radiotherapy are effective in improving overall survival for patients with angiosarcoma of the scalp and face.
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Affiliation(s)
- K Ogawa
- Department of Radiology, University of the Ryukyus, Okinawa, Japan.
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Annabell N, Yagi N, Umetani K, Wong C, Geso M. Evaluating the peak-to-valley dose ratio of synchrotron microbeams using PRESAGE fluorescence. J Synchrotron Radiat 2012; 19:332-339. [PMID: 22514166 PMCID: PMC3621279 DOI: 10.1107/s0909049512005237] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2011] [Accepted: 02/06/2012] [Indexed: 05/31/2023]
Abstract
Synchrotron-generated microbeam radiotherapy holds great promise for future treatment, but the high dose gradients present conventional dosimetry with a challenge. Measuring the important peak-to-valley dose ratio (PVDR) of a microbeam-collimated synchrotron source requires both a dosimeter and an analysis method capable of exceptional spatial resolution. The PVDR is of great interest since it is the limiting factor for potential application of the microbeam radiation therapy technique clinically for its tissue-sparing properties (i.e. the valley dose should be below the tolerance of normal tissue). In this work a new method of measuring the dose response of PRESAGE dosimeters is introduced using the fluorescence from a 638 nm laser on a confocal laser-scanning microscope. This fluorescent microscopy method produces dosimetry data at a pixel size as low as 78 nm, giving a much better spatial resolution than optical computed tomography, which is normally used for scanning PRESAGE dosimeters. Using this technique the PVDR of the BL28B2 microbeam at the SPring-8 synchrotron in Japan is estimated to be approximately 52:1 at a depth of 2.5 mm. The PVDR was also estimated with EBT2 GAFchromic films as 30.5:1 at the surface in order to compare the PRESAGE fluorescent results with a more established dosimetry system. This estimation is in good agreement with previously measured ratios using other dosimeters and Monte Carlo simulations. This means that it is possible to use PRESAGE dosimeters with confocal microscopy for the determination of PVDR.
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Affiliation(s)
| | - N. Yagi
- JASRI/SPring-8, Hyogo 679-5198, Japan
| | | | - C. Wong
- William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, Australia
| | - M. Geso
- School of Medical Science, RMIT University, Plenty Road, Melbourne, Victoria 3083, Australia
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32
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Dilanian RA, Darmanin C, Varghese JN, Wilkins SW, Oka T, Yagi N, Quiney HM, Nugent KA. Structure analysis of two-dimensional membrane proteins using X-ray powder diffraction data. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311085035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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33
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Hagiya K, Mikouchi T, Zolensky ME, Joy K, Ohsumi K, Terada Y, Yagi N, Takata M. Identification of mineral in thin section by energy-scanning X-ray diffraction. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311079505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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34
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Hooper SB, Kitchen MJ, Fouras A, Wallace MJ, Dubsky S, Siu KKW, Siew ML, Yagi N, Uesugi K, Lewis RA. Combined Lung Imaging and Respiratory Physiology Research at SPring-8. ACTA ACUST UNITED AC 2011. [DOI: 10.1080/08940886.2011.567164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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35
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Uesugi K, Hoshino M, Yagi N. Comparison of lens- and fiber-coupled CCD detectors for X-ray computed tomography. J Synchrotron Radiat 2011; 18:217-23. [PMID: 21335908 PMCID: PMC3042329 DOI: 10.1107/s0909049510044523] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Accepted: 10/31/2010] [Indexed: 05/06/2023]
Abstract
X-ray imaging detectors with an identical phosphor and a CCD chip but employing lens- and fiber-coupling between them have been compared. These are designed for X-ray imaging experiments, especially computed tomography, at the medium-length beamline at the SPring-8 synchrotron radiation facility. It was found that the transmittance of light to the CCD is about four times higher in the fiber-coupled detector. The uniformity of response in the lens-coupled detector has a global shading of up to 40%, while pixel-to-pixel variation owing to a chicken-wire pattern was dominant in the fiber-coupled detector. Apart from the higher transmittance, the fiber-coupled detector has a few characteristics that require attention when it is used for computed tomography, which are browning of the fiber, discontinuity in the image, image distortion, and dark spots in the chicken-wire pattern. Thus, it is most suitable for high-speed tomography of samples that tend to deform, for example biological and soft materials.
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Affiliation(s)
- K. Uesugi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Sayo-cho, Hyogo 679-5198, Japan
| | - M. Hoshino
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Sayo-cho, Hyogo 679-5198, Japan
| | - N. Yagi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Sayo-cho, Hyogo 679-5198, Japan
- Correspondence e-mail:
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36
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Dilanian RA, Darmanin C, Varghese JN, Wilkins SW, Oka T, Yagi N, Quiney HM, Nugent KA. A new approach for structure analysis of two-dimensional membrane protein crystals using X-ray powder diffraction data. Protein Sci 2011; 20:457-64. [PMID: 21154412 DOI: 10.1002/pro.572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 10/10/2010] [Accepted: 11/24/2010] [Indexed: 11/09/2022]
Abstract
The application of powder diffraction methods to problems in structural biology is generally regarded as intractable because of the large number of unresolved, overlapping X-ray reflections. Here, we use information about unit cell lattice parameters, space group transformations, and chemical composition as a priori information in a bootstrap process that resolves the ambiguities associated with overlapping reflections. The measured ratios of reflections that can be resolved experimentally are used to refine the position, the shape, and the orientation of low-resolution molecular structures within the unit cell, in leading to the resolution of the overlapping reflections. The molecular model is then made progressively more sophisticated as additional diffraction information is included in the analysis. We apply our method to the recovery of the structure of the bacteriorhodopsin molecule (bR) to a resolution of 7 Å using experimental data obtained from two-dimensional purple membrane crystals. The approach can be used to determine the structure factors directly or to provide reliable low-resolution phase information that can be refined further by the conventional methods of protein crystallography.
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Affiliation(s)
- R A Dilanian
- ARC Centre of Excellence for Coherent X-ray Science, School of Physics, The University of Melbourne, VIC 3010, Australia.
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37
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Jenkins M, Edgley A, Sonobe T, Fujii Y, Ishibashi-Ueda H, Kelly D, Schwenke D, Yagi N, Shirai M, Pearson J. In Situ Measurements of Cross-bridge Dynamics and Lattice Spacing in Diabetic Rat Hearts using X-ray Diffraction. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.019] [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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38
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Yagi N, Ohta N, Matsuo T, Tanaka T, Terada Y, Kamasaka H, Kometani T. A Microbeam Small-Angle X-ray Scattering Study on Enamel Crystallites in Subsurface Lesion. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/247/1/012024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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39
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Yagi N. Mechanism of latency relaxation in frog skeletal muscle. Prog Biophys Mol Biol 2010; 105:180-6. [PMID: 20969887 DOI: 10.1016/j.pbiomolbio.2010.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2010] [Revised: 09/22/2010] [Accepted: 10/12/2010] [Indexed: 01/02/2023]
Abstract
The latency relaxation is a small drop of tension before skeletal muscle begins to develop active tension. This phenomenon was found nearly one century ago but its origin has not been clarified. In this review, the hypotheses for its mechanism are discussed in terms of the recent experimental results using X-ray diffraction. The latency relaxation takes place almost simultaneously as the structural change of the regulatory protein troponin, an unspecified structural change of the thick filament, and increase in stiffness. It seems difficult to associate all of these with the latency relaxation by assuming a simple mechanism.
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Affiliation(s)
- N Yagi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo, Japan.
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Abstract
1. Local differences in the effects of stimulation of parts of the eye by light are expressed in Dixippus morosus by differential circus movements. 2. The angle of inclination of the body axis toward one source of light when the animal is on a vertical plane with light from one side is inversely proportional to the logarithm of the intensity of the light.
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Affiliation(s)
- N Yagi
- Laboratory of General Physiology, Harvard University, Cambridge
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Tanaka T, Yagi N, Ohta T, Matsuo Y, Terada H, Kamasaka K, To-o K, Kometani T, Kuriki T. Evaluation of the distribution and orientation of remineralized enamel crystallites in subsurface lesions by X-ray diffraction. Caries Res 2010; 44:253-9. [PMID: 20516685 DOI: 10.1159/000314672] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2008] [Accepted: 02/25/2010] [Indexed: 11/19/2022] Open
Abstract
Remineralization is the process by which hydroxyapatite (HAp) is restored in enamel subsurface lesions, and transversal microradiography (TMR) has been used to analyze remineralization in terms of the recovery of mineral content. In this study, we directly detected the distribution and orientation of longitudinal HAp crystallite at the remineralized zone in enamel subsurface lesions by using an X-ray microbeam (6-mum diameter) diffraction method. This method was demonstrated and involves the simultaneous detection of wide-angle X-ray diffraction (WAXRD) and small-angle X-ray scattering (SAXS). WAXRD reflects the amount of HAp crystallites, and SAXS reflects that of voids in crystallites. The polished surface of a bovine enamel block was divided into three zones of sound, demineralized, and remineralized zones. Thin sections of approximately 150 mum thickness were then cut perpendicular to the surface, and subjected to WAXRD and SAXS following TMR. The increase in the amount of HAp crystallites and the decrease in voids in the crystallites at the remineralized zone were detected by WAXRD and SAXS, respectively, which was consistent with the result of TMR. This study indicates that both the spatial distribution and orientation of the restored HAp crystals in the remineralization process at the subsurface lesion can be simultaneously analyzed by the X-ray diffraction methods.
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Affiliation(s)
- T Tanaka
- Institute of Health Sciences, Ezaki Glico Co. Ltd., Osaka, Japan.
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42
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Yoshida N, Wakabayashi N, Kanemasa K, Sumida Y, Hasegawa D, Inoue K, Morimoto Y, Kashiwa A, Konishi H, Yagi N, Naito Y, Yanagisawa A, Yoshikawa T. Endoscopic submucosal dissection for colorectal tumors: technical difficulties and rate of perforation. Endoscopy 2009; 41:758-61. [PMID: 19746316 DOI: 10.1055/s-0029-1215028] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [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: 12/13/2022]
Abstract
BACKGROUND AND STUDY AIM Endoscopic submucosal dissection (ESD) for colorectal tumors is not generally recommended because of the technical difficulties and complications, including perforation. These aspects of ESD are thoroughly analyzed in our retrospective study. PATIENTS AND METHODS We studied 105 colorectal tumors, from 100 patients, that were treated by ESD at the Kyoto Prefectural University of Medicine or Nara City Hospital between 2005 and 2008. We analyzed tumor size, operation time, rate of en bloc resection, and complications. In addition, we thoroughly investigated the cases of perforation. RESULTS The average tumor size was 30.4 mm; average operation time, 102 min; and rate of en bloc resection, 88.5 %. Perforation occurred in 10.4 % of the ESD procedures. Of the 11 perforations, 8 were detected during ESD and treated by clip closure during endoscopy, while 3 were evident only on subsequent routine computed tomography (CT); these were also managed conservatively. A case of postoperative hemorrhage was also observed. CONCLUSIONS ESD effectively achieved a high rate of en bloc resection. However, the perforation rate was substantial; hence, improvement in the ESD method is required. The outcomes of ESD, especially for early colorectal malignancies, need to be assessed further.
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Affiliation(s)
- N Yoshida
- Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine Graduate School of Medical Science, Kyoto 602-8566, Japan.
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Abstract
Patients with severe primary headache may benefit from consultation with headache specialists, but doctor attendance rates in Japan are very low. More headache patients might consult headache specialists if these specialists were more widely recognized by the public. To determine what information prompted patients to seek consultation with a headache specialist, we questioned 256 primary headache patients about the source of the helpful information concerning consultation with headache specialists. From 191 patients, a total of 235 responses to the questionnaire were obtained. The most common response was ‘websites’ (33.2%), followed by ‘professionals’ (23.8%), ‘acquaintances’ (20.9%), ‘print media’ (6.8%) and ‘TV/radio’ (3.4%). Patients who indicated websites showed the most severe pain and highest impact of headache, and accounted for 52.4% of those with cluster headaches. Development of websites concerning headache specialists would seem likely to increase doctor attendance rates for patients with primary headache.
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Affiliation(s)
- N Imai
- Department of Neurology, Shizuoka Red Cross Hospital, Shizuoka, Japan
| | - N Yagi
- Department of Neurology, Shizuoka Red Cross Hospital, Shizuoka, Japan
| | - T Konishi
- Department of Neurology, Shizuoka Red Cross Hospital, Shizuoka, Japan
| | - M Serizawa
- Department of Neurology, Shizuoka Red Cross Hospital, Shizuoka, Japan
| | - M Kobari
- Department of Neurology, Shizuoka Red Cross Hospital, Shizuoka, Japan
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44
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Rahman W, Ackerly T, Bishara N, Jackson P, Wong C, Davidson R, Dep P, Yagi N, Geso M. SU-DD-A3-05: Radiosensitization of Endothelial Cells Model Using Gold Nanoparticles for Microbeam Radiotherapy. Med Phys 2009. [DOI: 10.1118/1.3181085] [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: 11/07/2022] Open
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45
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Yagi N, Ohta N, Matsuo T, Tanaka T, Terada Y, Kamasaka H, To-o K, Kometani T, Kuriki T. Evaluation of enamel crystallites in subsurface lesion by microbeam X-ray diffraction. J Synchrotron Radiat 2009; 16:398-404. [PMID: 19395806 DOI: 10.1107/s090904950900449x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Accepted: 02/07/2009] [Indexed: 05/27/2023]
Abstract
Early caries lesion is a demineralization process that takes place in the top 0.1 mm layer of tooth enamel. In this study, X-ray microbeam diffraction was used to evaluate the hydroxyapatite crystallites in the subsurface lesion of a bovine enamel section and the results are compared with those obtained by transversal microradiography, a method commonly used for evaluation of tooth mineral. Synchrotron radiation from SPring-8 was used to obtain a microbeam with a diameter of 6 microm. Wide-angle X-ray diffraction reports the amount of hydroxyapatite crystals, and small-angle X-ray scattering reports that of voids in crystallites. All three methods showed a marked decrease in the enamel density in the subsurface region after demineralization. As these diffraction methods provide structural information in the nanometre range, they are useful for investigating the mechanism of the mineral loss in early caries lesion at a nanometre level.
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Affiliation(s)
- N Yagi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
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46
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Vine DJ, Paganin DM, Pavlov KM, Uesugi K, Takeuchi A, Suzuki Y, Yagi N, Kämpfe T, Kley EB, Förster E. Deterministic retrieval of complex Green's functions using hard X rays. Phys Rev Lett 2009; 102:043901. [PMID: 19257417 DOI: 10.1103/physrevlett.102.043901] [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] [Received: 03/03/2008] [Revised: 12/21/2008] [Indexed: 05/27/2023]
Abstract
A massively parallel deterministic method is described for reconstructing shift-invariant complex Green's functions. As a first experimental implementation, we use a single phase contrast x-ray image to reconstruct the complex Green's function associated with Bragg reflection from a thick perfect crystal. The reconstruction is in excellent agreement with a classic prediction of dynamical diffraction theory.
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Affiliation(s)
- D J Vine
- School of Physics, Monash University, VIC 3800, Australia.
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47
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Crosbie JC, Svalbe I, Midgley SM, Yagi N, Rogers PAW, Lewis RA. A method of dosimetry for synchrotron microbeam radiation therapy using radiochromic films of different sensitivity. Phys Med Biol 2008; 53:6861-77. [DOI: 10.1088/0031-9155/53/23/014] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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48
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Kitchen MJ, Lewis RA, Morgan MJ, Wallace MJ, Siew ML, Siu KKW, Habib A, Fouras A, Yagi N, Uesugi K, Hooper SB. Dynamic measures of regional lung air volume using phase contrast x-ray imaging. Phys Med Biol 2008; 53:6065-77. [DOI: 10.1088/0031-9155/53/21/012] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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Hatta I, Nakazawa H, Obata Y, Ohta N, Inoue K, Yagi N. SAXD/WAXD study on structural change of intercellular lipid matrix in skin by applying chemicals. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308079646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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50
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Nozue Y, Sakurai T, Kasahara T, Yamaguchi N, Yagi N, Shinohara Y, Ogawa Y, Amemiya Y. Deformation behavior of drawn polymer spherulite studied by simultaneous micro SAXS–WAXS and POM. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308096001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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