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Biomedical subjects

R Tsugane

Publications and source records attributed to R Tsugane.

68 records · Page 4Linked to original sources
PubMed1976

[Supratentorial extradural hematomas following posterior fossa craniectomy (author's transl)].

Five cases of the supratentorial extradural hematomas secondary to the posterior fossa craniectomy were reported. The site of the hematoma was far from the operative field and two cases showed acute course and three were rather mild. The symptoms of this complication were the unsuspected sensorium disturbance, anisocoria and the non-functioning ventricular drainage. Two cases died of this complication and two were severely disabled. The mechanism of this complication is not clearly understood. The lowering of the ventricular pressure by the ventricular tap during the operation may play significant role in the formation of the extradural hematoma. The younger age of the cases and the long history of increased intracranial pressure were stressed in the literature. The significance of the management of the ventricular pressure during the operation was emphasized. The prevention is the best treatment.

Adult↗
PubMed1975

Scotomatous defects in the central visual field in pituitary adenomas.

In a series of 46 cases of pituitary adenomata (34 solid, 6 with yellow cyst, and 6 with hemorrhagic cyst), we found central scotomatous field defects in 8 patients. Of these 8 scotomatous cases 4 were associated with tumour containing a hemorrhagic cyst. We suggest that rapid expansion of the tumour is one of the principal etiological factors in the production of scotomatous instead of bitemporal field defects in patients with pituitary adenomas.

Adenoma↗
PubMed1975

Bulk flow in the cerebrospinal fluid system of the dog.

Ventriculo-cisternal, intracranial subarachnoid-to-subarachnoid space and spinal subarachnoid space perfusions were carried out on dogs. The perfusate contained inulin as a tracer and the design of these experiments was based upon the concept that inulin leaves cerebrospinal fluid (CSF) compartments only by means of bulk absorption, and that actual diffusion and active transport of inulin is negligibly small. Inulin was removed from different CSF spaces by bulk absorption at rates which varied linearly with hydrostatic pressure. The rate of formation of CSF is equal to inulin clearance plus the difference between outflow and inflow rates. The total CSF formation in dogs weighing 12 to 17 kg was measured as 0.065 ml/min, and 58.5 per cent of this amount was found to come from extraventricular CSF space. The rates are independent of hydrostatic pressure in the range studied.

Animals↗
PubMed1975

Growing skull fractures of childhood. Possible mechanism of its focal ventricular dilatation.

Four cases of growing skull fracture are presented. Pneumoencephalography done on these cases showed a moderate to extensive degree of focal ventricular dilatation beneath the skull defect. An important factor, heretofore overlooked in explaining this focal ventricular enlargement, is our hypothesis that the force exerted on the particular area of the ventricular wall represents a pulsatile CSF movement damped in the region which is liable to yield to this compression wave in the absence of covering resistant dura mater. Because of the importance of early diagnosis in order to avoid possible delayed neurologic complications such as convulsive disorders, it is advisable to carry on repeated radiological examinations of the skull following fracture in this particular age group until the fracture heals by the progressive apposition of the bone on either side of the fractured line.

Arachnoid↗