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Biomedical subjects

L Stejskal

Publications and source records attributed to L Stejskal.

At least 37 records · Page 2Linked to original sources
PubMed1981

Postural laterality in torticollis and torsion dystonia.

Tests of postural rotational laterality were carried out in 63 patients suffering from torticollis (53) or torsion dystonia with torticollis (10) and in 33 normal subjects. There was a correlation between the predominant direction of postural functions and the direction of the rotatory component of torticollis. Torticollis and torsion dystonia may be due to the release of a postural rotational laterality in pre-disposed subjects and not to a presumed asymmetric lesion of the brain-stem.

Adolescent↗
PubMed1981

Surgical possibilities for alleviation of axial dyskinesias - comparison with forced movements of the head and eyes.

107 patients suffering from axial dyskinesias (torticollis and torsion dystonia) were observed at our clinic over a period of 10 years. In 15 patients, stereotactic lesions involving the head-turning bundle at the caudatocapsular level, which mediates forced adversive movements, were performed. In 70% good to excellent results were confirmed. However, differences between forced adversive movements and torticollis were identified. There are striking motor and motivational similarities between torticollis and ritualized fixed action patterns of low-ranking subjects. The aetiology of axial dyskinesias, especially of torticollis, is multifactorial, long-term psychic stress being an important factor. The relationship of axial dyskinesias, especially of torticollis, to compulsive neuroses is discussed, and Mazar's 'adversive' target area is identified as a partial orbitomedial leukotomy.

Adult↗
PubMed1980

Counterpressure in torticollis.

In a group of 65 subjects suffering from torticollis counterpressure (geste antagonistique, Gegendruckphänomen) was studied clinically and by EMG. Clearcut conclusions on the genesis of counterpressure are drawn. Counterpressure is shown not to consist of a mere touch (triggering off a hypothetic unconditioned reflex), but always a force participating in the effort to achieve the midpositioning of the head. It is found to be the finest tuner in the balancing of the involuntary (dyskinetic) and voluntary (corrective) forces. A conditioned reflex may develop on this basis.

Adolescent↗
PubMed1980

Somatosensory evoked potentials in deep hypothermia.

Treatment with general anesthesia (neuroleptanalgesia) and deep hypothermia was performed on 8 patients suffering from epilepsy. The body temperature was decreased to 29 degrees C and the temperature in the brain ventricles to 16 degrees C. Somatosensory evoked potentials were recorded. Increase in latency of all waves was observed, and it was noted that the more distant the wave, the higher the increase in latency. Statistical values are given for N1, N2 and N3. A parallel decrease in the amplitudes of all components of the somatosensory evoked potential was also present.

Adolescent↗
PubMed1979

Postural reflexes in man.

In 40 adult patients stabilized on the tilt table, no evidence was found that the amount of activity at rest in spastic muscles depends on the position of the head in space. The influence of postural labyrinthine reflexes (Magnus) was not confirmed. The activity in spastic extensor muscles was significantly higher (t greater than 1%) in the prone position. The activity in spastic flexor muscles was higher (t greater than 1%) in the supine position. Extralabyrinthine forces (tonic stretch reflexes and exteroceptive reflexes) are assumed to be decisive in these changes. In the same group of patients, the symmetric deep neck reflexes were examined. The patient actively flexed his head forwards or backwards. Significant increase in the activity at rest in spastic extensor muscles on dorsal flexion of the head in the prone position was found (t greater than 1%). Significant increase in the activity at rest in spastic flexor muscles on ventral flexion of the head in the supine position was also found (t greater than 5%). The phenomena of irradiation are assumed to be decisive in these changes. In another group of 27 adults the asymmetric deep neck reflexes (Magnus and De Kleijn) were examined. The patient actively turned his head either to the left or to the right, while his arms were raised (Hoff-Schilder maneuver). When the degree of rotation of the head was slight, the trunk and arms deviated in the same direction. When the rotation of the head was extreme, and reached behind the shoulder, the trunk and arms often reversed the direction of deviation. The effect of asymmetric deep neck reflexes was not confirmed. Visual perception and the mechanism of focusing are assumed to be decisive in these changes. The head turns toward the object of interest in the visual field by the mechanism of eye-centering (Bender) and influences the position of the trunk and motor patterns of the upper extremities (motor principle "eyes-hand").

Adolescent↗