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S Ishiai

Publications and source records attributed to S Ishiai.

At least 19 recordsLinked to original sources
PubMed1992

Leftward search in left unilateral spatial neglect.

The authors' previous study with an eye camera revealed that when asked to mark the centre of a line patients with left unilateral spatial neglect persist in fixating a point on its right part and place the subjective midpoint there without searching leftwards. The present study examined the patterns of leftward search of nine patients with left unilateral spatial neglect when they were required to search for the left endpoint of the line after the bisection. The patients could search leftwards beyond the subjective midpoint to place the mark at the subjective left endpoint. The initial fixation in this search always fell near the point located to the left of the subjective midpoint by the distance between the subjective midpoint and the right endpoint of the line. In patients with severe neglect the search further to the left of this point was laborious and fell short of the true left endpoint in about 80% of the trials. Our results suggest that when asked to bisect a line patients with left unilateral spatial neglect subjectively see the line as it extends equally to either side of the point where they are going to mark the subjective midpoint.

Aged↗
PubMed1990

Pure agraphia of kanji due to thrombosis of the Labbé vein.

A case is described of a 56 year old Japanese male with pure agraphia of kanji (the Japanese morphograms) due to haemorrhagic infarction of the left temporal lobe caused by the rare condition of cortical vein thrombosis of Labbé. Writing kanji was severely impaired without disturbed consciousness, aphasia or apraxia. On the other hand, writing kana (the Japanese syllabograms), and reading kanji and kana were almost intact. This suggests that the process of writing kanji involves a different pathway from that of reading kanji in the left temporal lobe. Pure agraphia of kanji is considered to be similar to lexical agraphia in Indo-European languages, in that the writing system with a poor or irregular phoneme-grapheme transformation is impaired by the left temporal lesion. This case indicates the necessity for considering thrombosis of the Labbé vein when a subcortical haematoma is detected in a temporal lobe on computed tomography of the brain.

Agraphia↗
PubMed1990

Improvement of unilateral spatial neglect with numbering.

We examined 8 patients with moderate to severe left unilateral spatial neglect by means of a series of line cancellation tasks. We asked the patients to cross out lines in the 1st trial, to number lines in the 2nd trial, and again to cross out lines in the 3rd trial. In the 2nd trial with numbering, all the patients showed improvement of left unilateral spatial neglect. Numbering involved the successive use of increasing numbers. This process seemed to motivate the patients to continue searching for another line, even at the point when they would be satisfied that they had completed the task if they used simple crossing-out. Insufficient motivation for visuospatial searching may play an important role in unilateral spatial neglect observed in cancellation tasks.

Aged↗
PubMed1989

Visuospatial processes of line bisection and the mechanisms underlying unilateral spatial neglect.

Patients with unilateral spatial neglect fail to report or respond to stimuli contralateral to the lesion which usually involves the right parietal lobe. When asked to mark the centre of a horizontal line, these patients place the mark to the right of the true midpoint. It has been considered that they neglect the left part of the line and bisect the perceived line segment. We investigated the eye-fixation patterns of hemianopic patients with or without unilateral spatial neglect during the bisection of lines, using an eye camera. Hemianopic patients without unilateral spatial neglect saw the whole lines, searching to the endpoint on the hemianopic side, and bisected it correctly. In contrast, left hemianopics with unilateral spatial neglect never searched to the left hemianopic side. Once they fixated a certain point on the right part of the line, they persisted with this point and marked the subjective midpoint there. Taking left homonymous hemianopia into account, the subjective midpoint appeared to be marked, not at the centre of the line segment perceived in the seeing right visual field, but at the leftmost point of it. However, they could appreciate the deviation of the subjective midpoint in the right visual field when forced to fixate the left endpoint of the line. These findings suggest that the left hemisphere has the ability to estimate the midpoint of the line through the right visual field and that visuospatial disorder in the line bisection test is attributable to the pathological change in the right hemisphere. The results are interpreted to mean that left hemianopic patients with unilateral spatial neglect see a totalized image of a line extending equally to either side of the point where they are going to mark the subjective midpoint. We considered that the right hemisphere completes the line, using the visual input relating to the right part of the line perceived by the left hemisphere.

Adult↗
PubMed1989

[A technique of end-to-side anastomosis of a prosthetic graft to the ascending aorta: reinforcement of the anastomosis with wrapping of the ascending aorta].

In temporary, permanent or extra-anatomic bypass grafting to the side of the ascending aorta, a technique of prosthetic fabric wrapping of the ascending aorta associated with reinforcement of the anastomosis is devised as a simple and useful method for aortic surgery. With this technique, dislodgement of the vascular forceps can be prevented completely, and the ascending aortic wall may be protected from injuries owing to the vascular forceps.

Anastomosis, Surgical↗
PubMed1989

[The surgical treatment of ruptured thoracic aortic aneurysm with use of permanent bypass].

Two surgical cases with ruptured thoracic aortic aneurysm were reviewed. Case 1 was a 74-year-old female, and Case 2 was a 77-year-old female. In both cases, chest X-ray examination revealed a mass like shadow in the left superior mediastinum, and aortography demonstrated a ruptured saccular aneurysm distal to the left subclavian artery. Midsternotomy and an incision over the third left intercostal space were made to approach the aneurysm. Since inflammatory adhesion was marked in the perianeurysmal area, a permanent bypass was placed between the ascending and descending aorta followed by exclusion of the aneurysm. One of the two cases was alive, but the other case was died due to bleeding from the area of permanent aortic clamp.

Aged↗
PubMed1989

[Intramyocardial hemangioma of the right ventricle with successful resection--report of a case and review of the literature].

A 62-year-old man developed symptoms of heart failure. Echocardiography showed a dense mass arising from the free wall of the right ventricle and occupying about 75% of the right ventricular cavity. Selective coronary angiography demonstrated intense neovascularization of a cardiac neoplasm arising in the distribution of the right coronary artery. Under cardiopulmonary bypass the tumor was resected completely and the defect of the ventricular wall was repaired with Gore-tex (EPTFE) patch (area 7.5 X 5.0 cm). The size of the resected tumor was 10.0 X 9.5 X 3.4 cm and weighed 170 g. Histological examination of the tumor disclosed cavernous hemangioma. The post operative course was uneventful and the patient has remained asymptomatic after the surgery. To our knowledge, only 23 cases of intramyocardial or intracavital hemangioma were reported in the world literature and this may be the first report in Japan.

Heart Neoplasms↗
PubMed1988

[Extra-anatomic bypass operation of ruptured thoracoabdominal aortic aneurysm].

A successful surgical case of ruptured thoracoabdominal aortic aneurysm of Crawford type III was reported. The patient was a 40-year-old male suffering from cystic kidney, hypertension and dissecting aortic aneurysm. The operative procedure was implantation of a large Dacron graft between the ascending aorta and the common iliac arteries, with branches of small Dacron grafts anastomosed to the left common carotid, left subclavian, celiac, superior mesenteric and renal arteries, and exclusion of the aorta.

Adult↗
PubMed1987

"Sporadic" prealbumin-related amyloid polyneuropathy: report of two cases.

Two "sporadic" cases of amyloid polyneuropathy are reported. There was no family history or plasma cell dyscrasia. Both showed sensorimotor and autonomic polyneuropathy with onset in the seventh decade. Amyloid deposits in both cases reacted with anti-human prealbumin sera but not with antisera to human AA and anti-human immunoglobulin light-chain amyloids, including A kappa and A lambda. One patient had the abnormal serum prealbumin and abnormal DNA sequence found in type I familial amyloid polyneuropathy (FAP)(Japanese type). Investigations in "sporadic" amyloid polyneuropathy should include immunohistochemistry, using antisera to the different amyloid proteins, and the radioimmunoassay and recombinant DNA techniques for diagnosis of FAP.

Aged↗
PubMed1987

Eye-fixation patterns in homonymous hemianopia and unilateral spatial neglect.

Eye-fixation patterns while viewing simple patterns were quantitatively analysed in homonymous hemianopic subjects with or without unilateral spatial neglect (USN), using an eye camera. Hemianopic subjects without USN used the strategy to look at the hemianopic side of the patterns longer in order to compensate for their visual field defect. However, those with USN lacked this compensatory eye-fixation pattern.

Adult↗