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Biomedical subjects

M Shindo

Publications and source records attributed to M Shindo.

At least 253 records · Page 14Linked to original sources
PubMed1984

Changes in reciprocal Ia inhibition from wrist extensors to wrist flexors during voluntary movement in man.

Transmission in the Ia inhibitory pathway from wrist extensor muscles onto flexor MNs was studied at various times after the onset of voluntary wrist extension or flexion. At the very onset of wrist movements Ia inhibition was not changed, as compared to at rest, whereas later it progressively increased during wrist extension and decreased during wrist flexion. These results are discussed in relation to the different inputs converging onto Ia interneurones and it is suggested that their inhibition by Renshaw cells might be responsible for the results found at the onset of contraction.

Anterior Horn Cells↗
PubMed1984

Changes in reciprocal Ia inhibition during voluntary contraction in man.

Reciprocal Ia inhibition from ankle flexors to extensors was studied during voluntary tonic isometric dorsiflexion and plantar flexion in five normal subjects. The Ia inhibition was examined as the short-latency suppression of the soleus H-reflexes by stimulation of the low-threshold afferents in the common peroneal nerve (Mizuno et al. 1971). At rest, weak Ia inhibition was demonstrated in four subjects out of five, the maximal amount being 14.1 +/- 5.0% suppression of the control H-reflex. The absolute amount of inhibition, which was calculated by subtracting the mean size of the conditioned H-reflex from that of the control H-reflex and expressed as a percentage of the maximal M-response, increased during ankle dorsiflexion, and decreased or disappeared during plantar flexion in parallel with the amount of contraction. The neural mechanisms for facilitation of the Ia inhibitory pathway during dorsiflexion were considered to support the hypothesis of "alpha-gamma-linkage in reciprocal inhibition", i.e. combined facilitatory effects on the Ia inhibitory interneuron from the supraspinal centers directly and indirectly via the gamma motoneuron--Ia afferent route. The mechanism for inhibition of the pathway during plantar flexion was considered to be inhibition of the Ia interneuron of the flexor side by Ia interneuron of antagonist extensors. A quantitative aspect of activity in the reciprocal Ia inhibitory pathway on the performance of voluntary movement is revealed in this study.

Adult↗
PubMed1984

Relationship between myoelectric signals and blood lactate during incremental forearm exercise.

Five men performed incremental forearm exercise by using a modified hand grip dynamometer while external loads (1 Kg metal plate) were added at each succeeding minute until volitional exhaustion occurred. Myo-electric signals were recorded from the belly of the flexor carpi radialis-palmaris longus. By the use of an LSI-11/23 minicomputer, the digitized data were processed for integrated EMG (IEMG) and mean power frequency (MPF) by means of 512 point fast Fourier transform. Data from individuals revealed that venous lactate correlated highly with IEMG (range: 0.977 to 0.857, P less than 0.001) and MPF (-0.960 to -0.862, P less than 0.001) during the incremental exercise. Group data revealed that none of the parameters tested showed any significant changes between the onset of lactate threshold (LT), i.e., the onset of abrupt increases in lactate, and one minute prior to LT. However, when these parameters were tested between LT and one minute after LT, significant differences were observed for venous lactate (t = 3.16, P less than 0.05), IEMG (t = 3.02, P less than 0.05) and MPF (t = 3.84, P less than 0.05). It was concluded that analysis of myo-electric signals may provide a non-invasive measure of lactate threshold after which dynamic equilibrium of lactate production and utilization becomes unbalanced during the incremental forearm exercise.

Adult↗
PubMed1983

Intravesical chemotherapy of urinary bladder tumor in rabbit by ferromagnetic mitomycin C.

Considering the necessity of selective toxicity in cancer chemotherapy, an advantageous means of controlling the anticancer agent in the urinary bladder was facilitated by microencapsulation of the drug and ferrite particles. Pharmacokinetic analysis of intravesical instillation chemotherapy in rabbits proved that magnetic control of ferromagnetic microencapsulated mitomycin C (MMC) remarkably enhanced MMC absorption into the urinary bladder wall. Moreover, malignant bladder tumors in rabbits were successfully treated with this method.

Absorption↗
PubMed1983

[Recovery process of auditory perceptual disorders in a child with word deafness].

The patient was a right-handed boy. Pregnancy and delivery were normal. There were no neonatal complications. His development was normal until the age of 6 years and 10 months when he suddenly fell into coma. He was admitted to a hospital, where he was diagnosed as having encephalopathy of unknown cause. It was found that he did not respond to verbal stimuli after recovery from coma. He was referred to our hospital for detailed examination of hearing at the age of 7 years, and received neuroradiological and audiological examinations including X-ray CT, positron-CT, behavioral audiometry, auditory evoked response audiometry as well as other hearing and speech tests. Pure tone audiometry showed that auditory thresholds for pure tones ranging from 125 to 8,000 Hz were normal, while speech audiometry demonstrated that he was unable to discriminate test words. However, he accurately recognized environmental sounds and noises as well as sounds produced by musical instruments. The decreased uptake of 11C-glucose at the left temporal lobe was demonstrated by positron CT, although no abnormality was showed by X-ray CT. WISC-R showed he had normal intelligence. ITPA demonstrated that the psycholinguistic ability via visual channel remained intact, whereas auditory memory and auditory closure were markedly impaired. The boy had no difficulties in reading, naming and writing. Speech therapy was started as soon as diagnosis of word deafness was made. Until 6 months after onset, he never understood and repeated what was said to him.(ABSTRACT TRUNCATED AT 250 WORDS)

Aphasia↗
PubMed1982

[Indication and effect of intra-arterial injection of mitomycin microcapsules in the treatment of kidney cancer].

Though a variety of treatments have been employed as an adjuvant for renal cell carcinoma, none of them has proved to be significantly effective, suggesting the difficulty in the treatment of this disease. The transcatheter arterial chemoembolization utilizing mitomycin C microcapsules developed by us was applied to renal cell carcinoma with an attempt at enhancing the chemotherapy and embolization. The early results indicate that this mode of treatment facilitates radical nephrectomy due to its marked antineoplastic effects and provides a favourable prognosis in locally advanced renal cancer. The experimental and clinical profiles of intra-arterial microcapsules were presented.

Adenocarcinoma↗
PubMed1982

[Arterial infusion of microencapsulated mitomycin C for the treatment of locally recurrent carcinoma of the pelvic cavity].

Ethylcellulose microcapsules of mitomycin C (MMC) were prepared. The potential therapeutic effects of intra-arterial infusion of the microencapsulated anti-cancer drugs were considered to be a function of microembolization and prolonged the drug action, that is, chemoembolization. A total of 19 patients with locally recurrent carcinoma of the pelvic cavity was subjected to transcatheter arterial chemoembolization with microencapsulated MMC. These included 7 bladder carcinomas, 7 prostatic carcinomas, 2 ureter carcinomas, 1 rectal carcinomas, 1 ovarian carcinoma and 1 cervical carcinoma. Thirteen patients had several distant or lymph node metastases. The single dose of MMC ranged from 10 to 40 mg and the total dose in each patient varied from 10 to 90 mg (mean 35 mg). The therapeutic response was evaluated by Karnofsky's criteria in terms of subjective and objective changes. Of 18 patients, 11 patients were assessed to category of I-A, B or C and 9 patients were survived over one years. Hematological toxicity occurred in 4 (22%) of 18 patients, but no treatment was needed for 3 of 4 patients. Local pain and high fever lasted more than one week were experienced in one patient. Skin necrosis lasting for a few months occurred in 10 (56%) of 18 patients. Surgical ligation of the gluteal arteries considerably prevented this painful condition. In conclusion, our clinical experiences indicate that chemoembolization is effective as a preoperative and palliative measure in the treatment of locally recurrent carcinoma of the pelvis and also helpful to control intractable symptoms such as hemorrhage or pain in patients with several metastases.

Aged↗
PubMed1982

[A case of hysterical deafness].

A forty years old woman with hysterical deafness is reported. Chief complaints were bilateral hearing loss. Nothing particular was found in her past and family history. In 1977, on the 11th day of May, she was admitted to A city hospital because of headache and paresis of right limb. As angiography revealed an aneurysms of her anterior communicating artery, she was undertaken the surgery of clipping and coating of the aneurysms. Post-operatively, left hemiparalysis appeared and paresis of right limb developed because of spasm of right middle cerebral artery. On the 14th day of August, ventricular-peritoneal shunt's operation was performed. As soon as she recovered from postoperative coma, she complained of bilateral hearing loss. Because pure tone audiometry demonstrated complete loss of her hearing, she was referred to ENT department of Teikyo University Hospital. Findings were as follows: 1) She had a queer way of hearing because she could understand to hear limited persons' speech (her doctor and husband). 2) Pure tone audiometry showed complete loss of her hearing but the thresholds of auditory brain stem responses were 15 dB and those of slow vertex responses were 45 dB. These results suggested no lesion in cochlea and brain stem. 3) Rorschach test and sentence complete test were performed. The results of these tests suggested hysterical state or neurotic state. 4) Total intelligent quotients by WAIS were 69 which indicated borderline level. However, this value appeared to be incorrect because she was uncooperative. 5) CT scan revealed low density areas at right temporo-parietal lobes and left temporal lobe which were localized and small. Our findings suggested hysterical deafness but not auditory agnosia. During three years, she was referred to several hospitals for rehabilitation but didn't become well at all. On the third year of the onset, her husband became sick and admitted to her room of the same hospital. During that period, suddenly, she talked her hearing to improve and the pure tone audiometry demonstrated decrease in threshold. In conclusion, this event could give a final diagnosis of hysterical deafness but not auditory agnosia.

Adult↗