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Biomedical subjects

L Stejskal

Publications and source records attributed to L Stejskal.

17 recordsLinked to original sources
PubMed1992

Surgical treatment of persistent ductus arteriosus complicated by bacterial endocarditis.

A seven-year-old girl with persistent ductus arteriosus developed acute bacterial endocarditis with large vegetations in the ductus and the left pulmonary artery. Conservative management was not successful: repeated embolisation to the lungs necessitated operation during the acute endocarditis. Details of the operative technique are presented and discussed.

Child↗
PubMed1985

Somatosensory evoked potentials in patients with occlusions of cerebral arteries.

The material consists of 100 patients suffering from occlusion of a cerebral artery, admitted for the performance of arterial bypass. Before the operation SEPs of the median nerve and CT scans were taken. Three main types of SEP were found (symmetric, asymmetric-attenuated, asymmetric-augmented) and pathological changes of latency, amplitude and wave form of the primary complex N1-P2 were described. The changes were correlated with the localization and extent of the hypodense lesion in the cerebral hemispheres. The cause of the decreased latencies on the side of the lesion is discussed and reported in relation to 'travelling waves' (Cracco 1980) in normals. The cause of the increased amplitude on the side of the lesion is also discussed and reported in relation to a disturbance of the suppressor cortex 8s, 19s and of the head of the caudate nucleus.

Adult↗
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↗