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Tatsuya Morita - One of the best experts on this subject based on the ideXlab platform.
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Validation of the Simplified Palliative Prognostic Index Using a Single Item From the Communication Capacity Scale
Journal of pain and symptom management, 2015Co-Authors: Jun Hamano, Tatsuya Morita, Taketoshi Ozawa, Hideki Shishido, Masanori Kawahara, Shigeru Aoki, Akira Demizu, Masahiro Goshima, Keiji Goto, Yasuaki GyodaAbstract:Abstract Context Although the Palliative Prognostic Index (PPI) is a reliable and validated tool to predict the survival of terminally ill cancer patients, all clinicians cannot always precisely diagnose delirium. Objectives The primary aim of this study was to examine the predictive value of a simplified PPI. In the simplified PPI, a single item from the Communication Capacity Scale was substituted for the delirium item of the original. Methods This multicenter prospective cohort study was conducted in Japan from September 2012 through April 2014 and involved 16 palliative care units, 19 hospital-based palliative care teams, and 23 home-based palliative care services. Palliative care physicians recorded clinical variables at the first assessment and followed up patients six months later. Results A total of 2425 subjects were recruited; 2343 had analyzable data. The C-statistics of the original and simplified PPIs were 0.801 and 0.800 for three week and 0.800 and 0.781 for six-week survival predictions, respectively. The sensitivity and specificity for survival predictions using the simplified PPI were 72.9% and 67.6% (for three week) and 80.3% and 61.8% (for six week), respectively. Conclusion The simplified PPI showed essentially the same predictive value as the original PPI and is an alternative when clinicians have difficulties in diagnosing delirium.
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Impaired Communication Capacity and agitated delirium in the final week of terminally ill cancer patients: prevalence and identification of research focus.
Journal of pain and symptom management, 2003Co-Authors: Tatsuya Morita, You Tei, Satoshi InoueAbstract:The maintenance of intellectual activity is an important area in the "good death" concept. To clarify the Communication Capacity levels of terminally ill cancer patients in their final week, and to identify factors contributing to the development of Communication Capacity impairment and agitated delirium, a retrospective study was performed on 284 consecutive hospice inpatients. The data were collected by chart review, and two independent raters measured the degree of Communication Capacity and agitation in the last week, using multiple items from the Memorial Delirium Assessment Scale, the Communication Capacity Scale, and the Agitation Distress Scale. The percentages of patients who could achieve complex Communication were 43%, 28%, and 13% at 5 days, 3 days, and 1 day before death, respectively. Agitated delirium was identified in 20%. Patients receiving opioids at a dose of > or =120 mg oral morphine equivalents/day one week before death were significantly unable to communicate clearly 3 days before death (0.48 [0.28-0.84], P=0.011). Male gender and the presence of icterus were identified as significant contributors to the development of agitated delirium (odds ratios [95% C.I.]=2.6 [1.4-5.0], P
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Communication Capacity Scale and Agitation Distress Scale to measure the severity of delirium in terminally ill cancer patients: a validation study.
Palliative medicine, 2001Co-Authors: Tatsuya Morita, Satoshi Inoue, Junichi Tsunoda, Satoshi Chihara, Kiyoshi OkaAbstract:Although valid measurement of the severity of terminal delirium is of great importance in palliative care settings, existing instruments have considerable limitations. In order to quantify patients' Communication Capacity and agitated behaviour, two new operational observer-rating scales, the Communication Capacity Scale (Communication Scale) and Agitation Distress Scale (Agitation Scale), were validated. Thirty terminally ill cancer patients diagnosed with delirium were evaluated simultaneously by two palliative care physicians blinded to each other's coding using the Communication Scale and Agitation Scale. In addition, the Memorial Delirium Assessment Scale (MDAS), Delirium Rating Scale (DRS) and Sedation Scale were rated by one researcher. Both scales achieved high internal consistency and inter-rater reliability with Cronbach's alpha coefficients of 0.91 and 0.96, and Cohen's kappa values on each item of 0.72-1.00. The principal components analysis resulted in the emergence of only one component for each scale. The total score on the Communication Scale was highly associated with that of the MDAS (rho = 0.78), Sedation Scale (rho = 0.86), and cognitive items from the MDAS and DRS (rho = 0.83). The whole score on the Agitation Scale was significantly correlated with that of the DRS (rho = 0.61) and agitation items from the MDAS and DRS (rho = 0.61). In conclusion, the Communication Scale and Agitation Scale have acceptable reliability and validity to quantify patients' Communication Capacity and agitation symptoms of terminally ill cancer patients with delirium.
Satoshi Inoue - One of the best experts on this subject based on the ideXlab platform.
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Impaired Communication Capacity and agitated delirium in the final week of terminally ill cancer patients: prevalence and identification of research focus.
Journal of pain and symptom management, 2003Co-Authors: Tatsuya Morita, You Tei, Satoshi InoueAbstract:The maintenance of intellectual activity is an important area in the "good death" concept. To clarify the Communication Capacity levels of terminally ill cancer patients in their final week, and to identify factors contributing to the development of Communication Capacity impairment and agitated delirium, a retrospective study was performed on 284 consecutive hospice inpatients. The data were collected by chart review, and two independent raters measured the degree of Communication Capacity and agitation in the last week, using multiple items from the Memorial Delirium Assessment Scale, the Communication Capacity Scale, and the Agitation Distress Scale. The percentages of patients who could achieve complex Communication were 43%, 28%, and 13% at 5 days, 3 days, and 1 day before death, respectively. Agitated delirium was identified in 20%. Patients receiving opioids at a dose of > or =120 mg oral morphine equivalents/day one week before death were significantly unable to communicate clearly 3 days before death (0.48 [0.28-0.84], P=0.011). Male gender and the presence of icterus were identified as significant contributors to the development of agitated delirium (odds ratios [95% C.I.]=2.6 [1.4-5.0], P
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Communication Capacity Scale and Agitation Distress Scale to measure the severity of delirium in terminally ill cancer patients: a validation study.
Palliative medicine, 2001Co-Authors: Tatsuya Morita, Satoshi Inoue, Junichi Tsunoda, Satoshi Chihara, Kiyoshi OkaAbstract:Although valid measurement of the severity of terminal delirium is of great importance in palliative care settings, existing instruments have considerable limitations. In order to quantify patients' Communication Capacity and agitated behaviour, two new operational observer-rating scales, the Communication Capacity Scale (Communication Scale) and Agitation Distress Scale (Agitation Scale), were validated. Thirty terminally ill cancer patients diagnosed with delirium were evaluated simultaneously by two palliative care physicians blinded to each other's coding using the Communication Scale and Agitation Scale. In addition, the Memorial Delirium Assessment Scale (MDAS), Delirium Rating Scale (DRS) and Sedation Scale were rated by one researcher. Both scales achieved high internal consistency and inter-rater reliability with Cronbach's alpha coefficients of 0.91 and 0.96, and Cohen's kappa values on each item of 0.72-1.00. The principal components analysis resulted in the emergence of only one component for each scale. The total score on the Communication Scale was highly associated with that of the MDAS (rho = 0.78), Sedation Scale (rho = 0.86), and cognitive items from the MDAS and DRS (rho = 0.83). The whole score on the Agitation Scale was significantly correlated with that of the DRS (rho = 0.61) and agitation items from the MDAS and DRS (rho = 0.61). In conclusion, the Communication Scale and Agitation Scale have acceptable reliability and validity to quantify patients' Communication Capacity and agitation symptoms of terminally ill cancer patients with delirium.
T. Chen - One of the best experts on this subject based on the ideXlab platform.
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cal h _ infty estimation for uncertain systems with limited Communication Capacity
IEEE Transactions on Automatic Control, 2007Co-Authors: Huijun Gao, T. ChenAbstract:This paper investigates the problem of robust Hinfin estimation for uncertain systems subject to limited Communication Capacity. The parameter uncertainty belongs to a given convex polytope and the Communication limitations include measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. The problem of Hinfin filter design is first solved for a nominal system subject to the aforementioned information limitations, which is then extended to the uncertain case based on the notion of quadratic stability. To further reduce the overdesign in the quadratic framework, this paper also proposes a parameter-dependent filter design procedure, which is much less conservative than the quadratic approach. The quadratic and parameter-dependent approaches provide alternatives for designing robust Hinfin filters with different degrees of conservativeness and computational complexity. Two examples, including a mass-spring system, are utilized to illustrate the design procedures proposed in this paper.
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${\cal H}_{\infty}$ Estimation for Uncertain Systems With Limited Communication Capacity
IEEE Transactions on Automatic Control, 2007Co-Authors: Huijun Gao, T. ChenAbstract:This paper investigates the problem of robust Hinfin estimation for uncertain systems subject to limited Communication Capacity. The parameter uncertainty belongs to a given convex polytope and the Communication limitations include measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. The problem of Hinfin filter design is first solved for a nominal system subject to the aforementioned information limitations, which is then extended to the uncertain case based on the notion of quadratic stability. To further reduce the overdesign in the quadratic framework, this paper also proposes a parameter-dependent filter design procedure, which is much less conservative than the quadratic approach. The quadratic and parameter-dependent approaches provide alternatives for designing robust Hinfin filters with different degrees of conservativeness and computational complexity. Two examples, including a mass-spring system, are utilized to illustrate the design procedures proposed in this paper.
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Hα Filtering for Uncertain Systems with Limited Communication Capacity
2006 SICE-ICASE International Joint Conference, 2006Co-Authors: H. Gao, T. ChenAbstract:This paper investigates the problem of Hinfin filtering for uncertain systems subject to limited Communication Capacity. The parameter uncertainty belongs to a given convex polytope and the Communication limitations include measurement quantization, signal transmission delay and data packet dropout, which appear typically in a network environment. The problem of Hinfin filter design is first solved for a nominal system subject to the above information limitations, which is then extended to the uncertain case based on the notion of quadratic stability. To further reduce the overdesign in the quadratic framework, this paper also proposes a parameter-dependent filter design procedure, which is much less conservative than the quadratic approach. These two approaches provide alternatives for designing robust Hinfin filters with different degrees of conservativeness and computational complexity. A mass-spring system is utilized to illustrate the proposed design procedures
Huijun Gao - One of the best experts on this subject based on the ideXlab platform.
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Robust Estimation with Limited Communication Capacity
Communications and Control Engineering, 2014Co-Authors: Huijun GaoAbstract:This chapter deals with the problem of H-infinity filtering for networked control systems (NCSs) with limited Communication Capacity. Three typical phenomena, that is, measurement quantization, data package dropout, and transmission delay, are considered simultaneously to characterize a Communication network with limited Communication Capacity. First, a unified delay system model with norm-bounded uncertainty and two successive delay components is formulated for describing the considered filtering problem subject to these typical phenomena in a network environment. Then, by utilizing the Lyapunov-Krasovskii method, delay-dependent sufficient conditions in terms of LMIs are obtained for filtering performance analysis and filter design, respectively. Using the quadratic method and parameter-dependent method, two different approaches with different computational complexity and design conservatism are further proposed to cope with polytopic uncertainty. Finally, two numerical examples including simulation are employed to demonstrate the effectiveness of the proposed filter design method in this chapter.
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cal h _ infty estimation for uncertain systems with limited Communication Capacity
IEEE Transactions on Automatic Control, 2007Co-Authors: Huijun Gao, T. ChenAbstract:This paper investigates the problem of robust Hinfin estimation for uncertain systems subject to limited Communication Capacity. The parameter uncertainty belongs to a given convex polytope and the Communication limitations include measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. The problem of Hinfin filter design is first solved for a nominal system subject to the aforementioned information limitations, which is then extended to the uncertain case based on the notion of quadratic stability. To further reduce the overdesign in the quadratic framework, this paper also proposes a parameter-dependent filter design procedure, which is much less conservative than the quadratic approach. The quadratic and parameter-dependent approaches provide alternatives for designing robust Hinfin filters with different degrees of conservativeness and computational complexity. Two examples, including a mass-spring system, are utilized to illustrate the design procedures proposed in this paper.
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${\cal H}_{\infty}$ Estimation for Uncertain Systems With Limited Communication Capacity
IEEE Transactions on Automatic Control, 2007Co-Authors: Huijun Gao, T. ChenAbstract:This paper investigates the problem of robust Hinfin estimation for uncertain systems subject to limited Communication Capacity. The parameter uncertainty belongs to a given convex polytope and the Communication limitations include measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. The problem of Hinfin filter design is first solved for a nominal system subject to the aforementioned information limitations, which is then extended to the uncertain case based on the notion of quadratic stability. To further reduce the overdesign in the quadratic framework, this paper also proposes a parameter-dependent filter design procedure, which is much less conservative than the quadratic approach. The quadratic and parameter-dependent approaches provide alternatives for designing robust Hinfin filters with different degrees of conservativeness and computational complexity. Two examples, including a mass-spring system, are utilized to illustrate the design procedures proposed in this paper.
Kiyoshi Oka - One of the best experts on this subject based on the ideXlab platform.
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Communication Capacity Scale and Agitation Distress Scale to measure the severity of delirium in terminally ill cancer patients: a validation study.
Palliative medicine, 2001Co-Authors: Tatsuya Morita, Satoshi Inoue, Junichi Tsunoda, Satoshi Chihara, Kiyoshi OkaAbstract:Although valid measurement of the severity of terminal delirium is of great importance in palliative care settings, existing instruments have considerable limitations. In order to quantify patients' Communication Capacity and agitated behaviour, two new operational observer-rating scales, the Communication Capacity Scale (Communication Scale) and Agitation Distress Scale (Agitation Scale), were validated. Thirty terminally ill cancer patients diagnosed with delirium were evaluated simultaneously by two palliative care physicians blinded to each other's coding using the Communication Scale and Agitation Scale. In addition, the Memorial Delirium Assessment Scale (MDAS), Delirium Rating Scale (DRS) and Sedation Scale were rated by one researcher. Both scales achieved high internal consistency and inter-rater reliability with Cronbach's alpha coefficients of 0.91 and 0.96, and Cohen's kappa values on each item of 0.72-1.00. The principal components analysis resulted in the emergence of only one component for each scale. The total score on the Communication Scale was highly associated with that of the MDAS (rho = 0.78), Sedation Scale (rho = 0.86), and cognitive items from the MDAS and DRS (rho = 0.83). The whole score on the Agitation Scale was significantly correlated with that of the DRS (rho = 0.61) and agitation items from the MDAS and DRS (rho = 0.61). In conclusion, the Communication Scale and Agitation Scale have acceptable reliability and validity to quantify patients' Communication Capacity and agitation symptoms of terminally ill cancer patients with delirium.