Search PubMed⌕ Search

Biomedical subjects

M Tabuchi

Publications and source records attributed to M Tabuchi.

At least 91 records · Page 5Linked to original sources
PubMed1988

Intracarotid urokinase with thromboembolic occlusion of the middle cerebral artery.

Intracarotid urokinase infusion therapy was performed on 22 patients with evolving cerebral infarction due to acute thromboembolic occlusion of the middle cerebral artery. Mean time from onset of symptoms to start of infusion and mean dosage of urokinase were 4.5 hours and 927,000 units, respectively. Immediate recanalization was achieved in 10 patients (45%) after urokinase therapy. In patients with successful recanalization, rapid amelioration of symptoms followed the restoration of blood flow. Thrombolytic recanalization was associated with reduction of neurologic deficits and of computed tomography-demonstrable infarction volume. The reduction of infarction volume and functional outcome correlated highly with the degree of reflow. Hemorrhagic transformation of infarction occurred in four patients and controllable extracranial bleeding in three patients. These results support the safety and efficacy of urokinase therapy for acute thromboembolic occlusion of the middle cerebral artery.

Adult↗
PubMed1986

Hypergraphia: a right hemisphere syndrome.

A new right hemisphere symptom is reported. Five stroke patients with lesions in the perisylvian cortico-subcortical or thalamic region of the right hemisphere produced linguistically correct but semantically loose writing. The behaviour was initiated by subtle prompting and continued semiautomatically. A possible mechanism underlying this hypergraphia is discussed.

Aged↗
PubMed1986

[Analytical study of Xenopus hindlimb regenerate with special reference to muscle regeneration].

Amputated hindlimbs of Xenopus laevis, develop various types of regenerates in relation with amputation level as well as stage development. The present experiments is an attempt to study the histological characteristics of Xenopus regenerations, i.e., rational changes of tissue components along the length of the regenerated part with special emphasis on the degree of muscle regeneration. Four types of regenerates were studied viz; a 4th toe obtained from a completely restored regenerated limb at 126 days after amputation of limb at base level in stage 51. An amputated limb with no external sign of regeneration of limb at thigh level in stage 60. A spike-shaped regenerate at 96 days after amputation of limb at shank level in stage 63. A spike-shaped regenerate at about 2 years after amputation of limb at shank level in stage 60. Cross sectional areas of muscle, skin gland, epidermis and cartilage in each of the four types of regenerates were measured with Image Analyzing Apparatus (VIP 121 CH, Olympus Co.). The relative area of each tissue was expressed as a percentage of the cross sectional area of the limb. The obtained values were plotted along the length of the regenerate. Digitiform regenerates were found to be more or less similar to the control limbs, i.e., provided joints and muscle, while the heteromorphic spike or rod shaped regenerates were simply provided with cartilaginous axial core without joint formation. Muscle area were reduced rapidly near the amputation area of these heteromorphic regenerates with no more continuation in the regenerated tissue. It is interesting to mention that percentage cartilage area of about 2 years old spike regenerate was higher than that of similar 96 days regenerate. In addition muscle regeneration was completely absent even in such an aged regenerate. The area showed fairly similar ratio irrespective of the external appearance of the regenerate. In 32 regenerates of which limbs were amputated at various developmental stages ranging between stage 51 and adult stage, the histological condition of muscle at the amputation site, were well observed. In all digitated types of regenerates even in those with reduced number of toes, muscles were found grown well in the regenerates. In heteromorphic regenerates without toe formation muscle did not usually regenerate. In few cases, however, a small mass of myoblastic like cells or small aggregation of differentiated muscle cells without any structural continuation with the stump muscles, were seen to develop in the midst of the regenerate.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1984

Ataxic hemiparesis from small capsular hemorrhage. Computed tomography and somatosensory evoked potentials.

We studied three cases that fit the clinical syndrome of ataxic hemiparesis. Computed tomography revealed small hemorrhages of the posterior limb of the internal capsule in all the cases, and somatosensory evoked potential studies predicted a disturbance of the lemniscal pathway from the thalamus to the parietal sensory cortex without demonstrable sensory loss. These results suggested that ataxia of the contralateral limbs following capsular lesion might result from a disruption of the thalamocortical sensory projection. The site of the lesion, the pathologic cause, and the underlying mechanism of ataxia are not necessarily homogeneous within the syndrome.

Aged↗
PubMed1982

Selective loss of small myelinated and unmyelinated fibers in Shy-Drager syndrome.

The number and sizes of myelinated and unmyelinated fibers in biopsied sural nerves in cases with Shy-Drager syndrome were studied in comparison with cases with olivopontocerebellar degeneration not having autonomic dysfunction. In Shy-Drager syndrome there was a tendency for both small myelinated and unmyelinated fiber densities to be reduced in comparison with cases with olivopontocerebellar degeneration. Unmyelinated fibers more than 0.5 micrometers in diameter were significantly reduced in Shy-Drager syndrome, a fact suggesting myelinated fiber degeneration. Multilamellated Schwann cell processes, isolated Schwann cell processes, and collagen pockets were more numerous and conspicuous in cases with Shy-Drager syndrome. It was concluded that unmyelinated fibers and small myelinated fibers in the peripheral nerves were involved selectively in Shy-Drager syndrome. The significance of the findings was discussed in terms of autonomic dysfunction observed clinically.

Aged↗
PubMed1981

Renal cortex visualization and analysis of dynamic CT curves of the kidney.

Renal cortex visualization and dynamic renal computed tomography (CT) were carried out by bolus injection of contrast medium. In vivo renal cortex visualization showed that renal cortex volume and cortex thickness are both inversely correlated with age. The percentage volumes of cortex and columns of Bertin are correlated inversely in non renal-failure subjects. Percentage volumes of cortex tend toward low values in renal failure and status after renal transplantation. In analyzing dynamic renal CT curves, the corticomedullary junction time is a good index of mild impairment of renal function.

Acute Kidney Injury↗
PubMed1977

Spindle-shaped, cross-banded structures in human peripheral nerves.

Fusiform, cross-banded structures (fibrous long-spacing collagen, or Luse bodies) were found in a nerve contained in the perivascular connective tissue of the short saphenous vein and in the sural nerve in man. The periodicity of cross-bandings was 140-170 nm and there was no intraperiod striation. The banded structures were found either isolated in the endoneurial spaces or contiguous with the surface of Schwann cells or fibroblasts. The nature, origin, and pathological significance of structures of this type in peripheral nerve are briefly discussed.

Aged↗