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Biomedical subjects

V Gabersek

Publications and source records attributed to V Gabersek.

At least 91 records · Page 5Linked to original sources
PubMedDate not supplied

[Sleep polygraphy with recording of intracranial pressure and measure of cerebral blood volume in hydrocephalic infants (author's transl)].

This study was carried with the intention of explaining the causes of modifications in intracranial pressure (ICP) during paradoxical sleep (PS) in normal and hydrocephalic infants, and establishing relationships between these modifications and cerebral blood volume (CBV). All tests (conventional sleep polygraphy, ICP measured by a transducer on the fontanel, CBV measured by isotopic labelling of red blood cells in vivo) were carried out without use of surgical procedures. During paradoxical sleep there was a sustained wave of increased intracranial pressure lasting from 10 to 20 minutes, as well as phase-type variations lasting no longer than 1 minute. Increased ICP was also observed in the normal subjects. Recordings show that there is well-defined correlation between the sustained wave of high intracranial pressure and an increase in CBV.

Blood Volume↗
PubMedDate not supplied

[Determination of optokinetic reactivity by a sudden supra-optimal acceleration of the stimulus (author's transl)].

The authors describe a new method of optokinetic stimulation. The stimulus is applied during 3 successive sequences: the first and third include displacement of 1 to 2 black or white bands per second (apparent mean speed of 16 degrees/sec), while the second sequence comprises the sudden acceleration of 6 black or white bands per second (apparent mean speed of 59 degrees/sec.). Each sequence lasts 4 to 10 seconds. However many times the stimulus is repeated the optokinetic response becomes hyposynchronous at the frequency at which the bands are passing when the speed is increased, whereas the amplitude of the ocular responses is multiplied two to three times. The increase in the amplitude appears to be proportional to the reduction in frequency. In this way, optokinetic reactivity is tested when the subject looks in the three principal directions: horizontally, vertically, and obliquely. Particular types of reaction are observed in pathological conditions where they are either unadapted or incomplete, while absence of optokinetic reactivity can be found in all directions, several directions, or in one direction only.

Acceleration↗