[The sinusoidal infusion test--an additional filling test for evaluating the mechanisms of the volume-pressure compensation in the intracranial cerebrospinal fluid space].

A diagnostic additional filling test is described which is used for the assessment of the mechanisms of volume-pressure compensation. In the test infusion is used of "physiological" sinusoidal relationship between the infused volume and time. The duration of the test is 10 minutes and it does not require pressure stabilization.

[Writer's cramp syndrome treated successfully by thalamotomy].

In the literature the prevalent until now opinion was that writer's cramp was a disturbance of psychic origin or an occupational neurosis. However, the authors treated successfully three cases of this syndrome with thalamotomy in the years 1976-1982. Two cases were in subject with right-handedness who had graphospasm with evidence of increasing difficulty in writing until complete impossibility of further writing, after several years postural and intentional tremor appeared, and dystonic symptoms developed in the right foot.

[Cryohypophysectomy in acromegaly and gigantism by the stereotaxic method].

The authors report results of surgical treatment of 30 patients treated by cryohypophysectomy by the stereotactic method through the nose and sphenoid sinus in the years 1967-1979. The material included 28 cases of acromegaly and 2 cases of gigantism. The pathological manifestations in acromegaly and gigantism were analysed for demonstration which of them can regress after surgical treatment.

[Thalamic somatosensory potentials after peripheral stimulation and cortical somatosensory potentials after electric stimulation of thalamic nuclei VOa and VOp (preliminary report)].

In patients with extrapyramidal syndromes thalamic action potentials were recorded during operations with a five-point brain electrode and in the same cases somatosensory evoked potentials were recorded from the skull. Thalamic potentials were recorded after peripheral stimulation, and evoked potentials from the skull were recorded after electrostimulation of thalamic nuclei VOa and VOp. At the thalamic level a short-latency positive-negative potential had a maximal amplitude in one only lead, which confirmed sharp projection of body surface into various thalamic nuclei.

[Effect of cryosurgery of the thalamic nuclei on somatosensory evoked potentials].

Somatosensory evoked potentials were recorded in two groups of patients with extrapyramidal syndromes including: 1) parkinsonian syndromes, 2) spasmodic torticollis. In the first group stereotactic lesions were produced at the borderline between VOp and Vim nuclei, and in the second group they were situated in VOa and VOi thalamic nuclei. Short-latency components of the potentials were analysed assuming that they were the specific parts of the somatosensory potential and their value was doubtless, in contrast to the late latency components.