Publications by authors named "Masashi Hamanaka"

The long-term outcomes of patients with stroke or transient ischemic attack (TIA) after widespread use of direct oral anticoagulants (DOACs) were investigated. Patients with ischemic stroke or TIA admitted between April 2014 and September 2015 were prospectively enrolled and followed for up to 5 years after the index stroke or TIA. Primary outcome measures were any cause of death and stroke recurrence.

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Background: Long-term anticoagulant therapy in oldest-old persons poses the risk of bleeding complications. The aim of this study was to evaluate the long-term benefits of anticoagulant therapy for oldest-old stroke survivors with AF.

Methods: Patients with atrial fibrillation (AF) who were 90 years of age or older and were prescribed an anticoagulant on discharge were identified from a set of data from a prospective follow-up registry of 1,484 consecutive patients admitted for ischemic stroke or transient ischemic attack over a 4-year period beginning in 2014.

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The patient was a 78-year-old man. He was transferred to the emergency room presenting with aphasia and right hemiplegia. Head CT and CT angiography demonstrated a narrow territory of early ischemic signs and occlusion of the horizontal segment of the left middle cerebral artery (MCA), respectively.

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A 57-years-old man with a history of bronchial asthma and pansinusitis developed acute progressive muscle weakness and sensory disturbance of the distal limbs after upper respiratory infection. On day 15 after onset of sensory disturbance and muscle weakness, the patient admitted to our hospital. A neurological examination revealed asymmetry weakness of both proximal and distal muscles, "glove and stocking type" hypoesthesia, and paresthesia without obvious pain.

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Article Synopsis
  • - A 72-year-old man on hemodialysis for end-stage renal disease experienced an acute headache and was found to have abnormal signals in his left transverse to sigmoid sinus, indicating a possible dural arteriovenous fistula.
  • - Despite normal CT and MRI results, further tests showed occlusion of his left brachiocephalic vein, leading to intracranial venous reflux and increased intracranial pressure as potential causes for his persistent headache and orbital numbness.
  • - After a successful angioplasty procedure to treat the vein occlusion, the man's symptoms improved significantly; however, he later experienced discomfort and a re-occlusion, leading to a second angioplasty, highlighting the need to consider this condition in patients
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An 82-year-old man with advanced lung cancer who had declined aggressive therapy was transferred to our hospital due to sudden-onset consciousness disturbance, global aphasia, and right hemiplegia. An electrocardiogram showed atrial fibrillation, and brain MRI and MRA revealed acute ischemic lesions of the left hemisphere and occlusion of the left internal carotid artery (ICA), respectively. We diagnosed acute ischemic stroke due to left ICA occlusion and performed endovascular thrombectomy, which resulted in complete recanalization of the left ICA after retrieval of the culprit embolus.

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A 66-year-old woman was admitted to our institution with sudden-onset weakness of her left upper limb. Neurological examination revealed monoplegia and sensory loss of the limb. A brain MRI did not find evidence of an acute ischemic stroke.

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A 69-year-old man presented with a history of personality change for several years. He was admitted to our hospital due to partial seizure. A cerebrospinal fluid test and an electroencephalogram showed no specific abnormalities, but brain magnetic resonance imaging revealed abnormal findings in the right temporal pole, bilateral amygdala to hippocampus, and insular cortex.

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A 61-year-old man was admitted to our institution with progressive hypoacusia, double vision, and lightheadedness. Neurological examination on day 6 of his illness showed severe hypoacusia, mild confusion, ocular motility disorder, truncal ataxia and absence of a deep tendon reflex. MRI fluid-attenuated inversion recovery imaging revealed symmetrical high intensities in the tectum of the midbrain, involving the bilateral inferior colliculi and the bilateral medial thalami, which suggested Wernicke encephalopathy (WE).

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A 49-year-old woman was admitted to our hospital with gradually progressive weakness of the limbs for about 20 days. She presented with weakness of the limbs, predominantly in the proximal portion, and slight dysesthesia of the limbs, predominantly in the distal portion. Repeated nerve conduction examination revealed axonopathy dominantly in the motor neurons.

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A 64-year old woman was admitted to our hospital with subacute onset paraparesis and sensory disturbance at a level below Th10. Spinal MRI showed a T2 weighted high-signal intensity lesion at a level from Th5 to Th12, and an abdominal CT showed a mass in the left kidney. Her paraparesis deteriorated rapidly, and administration of high dose methyl prednisolone followed by oral steroid therapy was started before obtaining of a definitive diagnosis.

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Emergency neuroendovascular revascularization is a reperfusion therapy for acute stroke. The operator for this therapy has to obtain a license as a specialist in endovascular procedures. For neurologists wishing to acquire this license, there are two kinds of training programs: full-time training and concurrent training.

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Objective: In order to identify the factors that influence the swallowing function in patients who develop Wallenberg syndrome (WS) following lateral medullary infarction (LMI), we examined various patient characteristics, including the passage pattern abnormality (PPA) of a bolus through the upper esophageal sphincter (UES).

Methods: Fifty-four pure LMI patients with dysphagia participated in this study. PPA, defined as the failure of bolus passage through the UES corresponding to the intact side of the medulla, was identified during videofluorographic swallowing evaluations of each patient.

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We report a rare case of a young man who had spontaneous left vertebrovertebral fistula associated with neurofibromatosis Type 1. His complaints were severe pain in the left neck and numbness in the left upper extremity. Cervical MR images showed a large abnormal flow void to the left of the spinal canal.

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Background: Small deep brain infarcts are often caused by two different vascular pathologies: 1. atheromatous occlusion at the orifice of large caliber penetrating arteries termed branch atheromatous disease (BAD) and 2. lipohyalinotic degenerative changes termed lipohyalinotic degeneration (LD).

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Background: Progressive motor deficits (PMD) are common in cerebral penetrating artery disease (PAD) during the acute stage and leads to severe disability. Reliable predictors and stroke mechanism for PMD in PAD have been yet to be elucidated. Moreover, difference of predictors between topographically classified PAD has not ever been systematically studied.

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We reported a 66-year-old man who complained of headache, vertigo, vomiting and chest oppression sensation. He could not walk veering to right and spontaneous contrarateral horizontal nystagmus was noted. A MRI DWI showed scattered multiple small high signals within the territory of left medial branch of posterior inferior cerebellar artery.

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