Publications by authors named "Tetsuji Inagawa"
Article Synopsis
- This observational study examines whether starting gait training early with a hybrid assistive limb (HAL) can benefit stroke patients.
- Researchers analyzed data from patients who had acute strokes, dividing them into early and late groups based on when they began gait training.
- Results showed that early training significantly improved lower limb motor function and overall disability compared to delayed training, although upper limb recovery and one other measure did not differ significantly.
Article Synopsis
- The "Izumo Study" documented the incidence of subarachnoid hemorrhage (SAH) in Izumo City, Japan, from 1980-1998, but there was no follow-up research for Shimane Prefecture post-1998.
- This study aimed to estimate the age-adjusted incidence rate (AAIR) of SAH in Shimane from 1999 to 2017, while observing a decline in the case-fatality rate over the same period.
- Results showed a significant decrease in the estimated AAIR of SAH, from 33.6 per 100,000 person-years in 1999 to 24.7 in 2017, confirming a declining trend in SA
Article Synopsis
- The study investigates which stroke patients benefit most from robot-assisted upper limb rehabilitation, specifically using the hybrid assistive limb (HAL-SJ) technology.
- Using a machine learning method called the CHAID model, researchers identified key factors like age, sex, and cognitive function that predict a patient's improvement in upper limb function after therapy.
- Results showed that the initial Fugl-Meyer Upper Extremity Evaluation score was the best predictor of improvement, with the model achieving high accuracy, suggesting early intervention in patients with moderate dysfunction leads to better outcomes.
Prevalence of cerebral aneurysms in autopsy studies: a review of the literature.
Neurosurg Rev
August 2022
Article Synopsis
- * Older patients generally have UCAs, which are typically smaller than RCAs, and minute UCAs (<2 mm) are found in 10-20% of the population; only a small percentage of these minute UCAs grow larger or rupture.
- * There's a higher prevalence of UCAs and RCAs among elderly individuals and women, and further advancements
Article Synopsis
- The study investigates the impact of different frequencies of using the single-joint hybrid assistive limb (HAL-SJ) on recovery of upper limb motor function and daily living activities in stroke patients.
- Patients were divided into high and low frequency use groups, and improvements were assessed after 30 days, showing that high-frequency users had better results in specific motor functions and daily living assessments.
- However, frequent use of the HAL-SJ didn’t significantly increase the number of patients achieving clinically meaningful improvements, suggesting that while frequency may aid recovery, it doesn't guarantee better outcomes for everyone.
Article Synopsis
- The study aimed to assess the effectiveness of five supervised machine learning algorithms in predicting the possibility of home discharge for stroke patients based on a dataset of 481 individuals.
- The algorithms evaluated included decision tree, linear discriminant analysis, k-nearest neighbors, support vector machine, and random forest, measured by classification accuracy, area under the curve (AUC), and F1 score.
- Results indicated that the k-NN model had the highest classification accuracy (84.0%), while the SVM model excelled in AUC and sensitivity, with both models showing promise for predicting home discharge outcomes.
Article Synopsis
- The study investigates how physical environmental factors impact the home discharge of stroke patients who use wheelchairs, suggesting that these factors are often overlooked.
- The researchers utilized machine learning, specifically the CHAID algorithm, to analyze data from stroke patients in rehabilitation, aiming to identify what influences successful home discharge.
- Key findings showed that house renovations and the presence of sloping roads are significant factors that impact whether wheelchair users can be discharged to home, highlighting the need for clinicians to consider these environmental elements in their assessments.
Background And Purpose: The importance of environmental factors for stroke patients to achieve home discharge was not scientifically proven. There are limited studies on the application of the decision tree algorithm with various functional and environmental variables to identify stroke patients with a high possibility of home discharge. The present study aimed to identify the factors, including functional and environmental factors, affecting home discharge after stroke inpatient rehabilitation using the machine learning method.
View Article and Find Full Text PDFAging Changes of Aneurysmal Subarachnoid Hemorrhage: A 35-year, Hospital-Based Study.
J Stroke Cerebrovasc Dis
November 2020
Background: The etiology and background factors which cause decreases in the size of ruptured intracranial aneurysms remain unclear.
Objective: To clarify the age- and sex-related differences in aneurysmal subarachnoid hemorrhage (SAH) based on a 35-year-old hospital database and demographic data.
Methods: A database of patients admitted to our hospital with aneurysmal SAH from 1983 to 2017 was split into 5-year intervals and analyzed.
Article Synopsis
- The study focuses on creating clinical prediction rules (CPRs) using changeable variables to predict activities of daily living (ADL) dependence in stroke patients, as some factors like age are unchangeable.
- A total of 1,125 stroke patients were analyzed through machine learning, specifically using the classification and regression tree (CART) method, which utilized Functional Independence Measure (FIM) subscores.
- The CART model found that certain FIM transfer scores were the best indicators of ADL dependence, achieving an accuracy rate of 83%.
Purpose: Previous studies have suggested that upper limb rehabilitation using therapeutic robots improves motor function of stroke patients. However, the effect of upper limb robotic rehabilitation on improving functioning in activities of daily living (ADL) remains unclear. The present study aimed to determine whether upper limb rehabilitation using single joint Hybrid Assistive Limb (HAL-SJ) affects ADL function and the use of a hemiparetic arm in ADLs of acute stroke patients.
View Article and Find Full Text PDFObjective: There has been controversy as to whether intraventricular hemorrhage (IVH) after aneurysmal subarachnoid hemorrhage (SAH) contributes to angiographic cerebral vasospasm (aCV) and delayed cerebral ischemia (DCI). Computed tomography-based SAH scales that did and did not consider IVH were compared in terms of ability to predict aCV, DCI, and outcome.
Methods: We reviewed 390 patients with ruptured aneurysms who had been treated surgically by day 3 by the same surgeon (T.
A 59-year-old woman presented with right sensory loss and right hemiparesis. In February 2013, she was admitted to Araki Neurosurgical Hospital. A magnetic resonance imaging was performed that revealed a left temporal lobe hemorrhage.
View Article and Find Full Text PDFObjective: To examine the literature on risk factors for cerebral vasospasm (CV), one of the most serious complications following aneurysmal subarachnoid hemorrhage (SAH), with special reference to the definition of CV.
Methods: Using standard search engines, including PubMed, the medical literature on risk factors for CV after SAH was reviewed, and the best definition representative of CV was searched.
Results: Severe SAH evident on computed tomography scan was the only consistent risk factor for CV after SAH.
[Purpose] The efficacy of diffusion tensor imaging in the prediction of motor outcomes and activities of daily living function remains unclear. We evaluated the most appropriate diffusion tensor parameters and methodology to determine whether the region of interest- or tractography-based method was more useful for predicting motor outcomes and activities of daily living function in stroke patients. [Subjects and Methods] Diffusion tensor imaging data within 10 days after stroke onset were collected and analyzed for 25 patients.
View Article and Find Full Text PDFRisk factors associated with cerebral vasospasm following aneurysmal subarachnoid hemorrhage.
Neurol Med Chir (Tokyo)
June 2014
We studied the risk factors associated with cerebral vasospasm following aneurysmal subarachnoid hemorrhage (SAH). The subjects were 370 patients with ruptured aneurysms who fulfilled all of the following criteria: admission by day 2 after onset, operation performed by day 3 by the same surgeon (T.I.
View Article and Find Full Text PDFObject: A community-based study was conducted to estimate the frequency of and evaluate the clinical features related to delayed diagnosis of aneurysmal subarachnoid hemorrhage (SAH).
Methods: Between 1980 and 1998, 358 patients with aneurysmal SAH underwent treatment in Izumo, Japan. The diagnosis of SAH was delayed in 76 patients (21%) and was early in 282 (79%).
Background: Prevention of aneurysmal subarachnoid hemorrhage (SAH) can be achieved by reducing risk factors, which include those for aneurysm formation and aneurysm rupture. However, neither of these 2 factors has been discussed separately so far. A case control study was undertaken in Shimane, Japan, to identify modifiable risk factors for the formation and rupture of aneurysms.
View Article and Find Full Text PDFSize of ruptured intracranial saccular aneurysms in patients in Izumo City, Japan.
World Neurosurg
February 2010
Background: A community-based study was conducted to evaluate the factors related to the size of ruptured aneurysms and the effects of aneurysm size on clinical features.
Methods: Data from 358 patients with subarachnoid hemorrhage (SAH) treated between 1980 and 1998 in Izumo, Japan, were reviewed. In 285 of these patients, the sizes of the ruptured aneurysms were determined.
Site of ruptured intracranial saccular aneurysms in patients in Izumo City, Japan.
Cerebrovasc Dis
September 2010
Background And Purpose: A community-based study was conducted to estimate the site distribution of ruptured intracranial aneurysms and to evaluate clinical features related to aneurysm site.
Methods: The author reviewed data from 358 patients with aneurysmal subarachnoid hemorrhage (SAH) treated between 1980 and 1998 in Izumo, Japan. In 291 of these patients, the sites of the ruptured aneurysms were confirmed.
Background: A community-based study was conducted to estimate the incidence rates of multiple aneurysms and to investigate the factors related to multiplicity.
Method: The subjects were 291 patients with ruptured saccular aneurysms treated between 1980 and 1998, in Izumo, Japan. There were 403 aneurysms in total, and 78 patients (27%) had multiple aneurysms.
A 56-year-old man presented with a giant serpentine aneurysm arising from the middle cerebral artery (MCA) manifesting as right hemiparesis and motor aphasia. Magnetic resonance imaging and digital subtraction angiography identified the giant serpentine aneurysm arising from the MCA. The patient was treated surgically.
View Article and Find Full Text PDFThe annual incidence rate of primary intracerebral hemorrhage (ICH) in Izumo City, Japan, appears to be the highest rate among those reported. Despite improvement of management and surgical therapy, the overall morbidity and mortality after ICH are still high. The author investigated the risk factors for ICH in patients in Izumo.
View Article and Find Full Text PDF