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Biomedical subjects

T Bacia

Publications and source records attributed to T Bacia.

At least 55 records · Page 3Linked to original sources
PubMedDate not supplied

[Preoperative and intraoperative studies of evoked potentials in patients with spinal cord injury].

Preoperative recording of evoked potentials after stimulation of the tibial nerve was followed by similar intraoperative recording in 6 patients with cauda and conus terminalis tumours and 2 patients with intervertebral disc prolapse at lumbar level. The shape and latency of these potentials were sensitive indicators of the level and degree of damage to the nervous elements in this area. The selectivity of the method was significantly higher during intraoperative recording. Monitoring of these potentials may serve for control of the integrity of sensory pathways during neurosurgical interventions.

Adult↗
PubMedDate not supplied

[Effect of stimulation of the spinal cord on phasic and tonic reflexes in patients with central motor neuron damage].

Spinal cord stimulation (SCS) is a method enabling the control of increased muscle tonus to be achieved in various spinal cord injuries. Polyelectromyographic (PEMG) methods were used for neurophysiological assessment of the degree of cord damage and persistent spinal reflexes as well as supramedullary influences. The analysed material comprised 40 PEMG records in 19 patients with spastic paraparesis or paraplegia after cord injury, cord tumour or multiple sclerosis. In 15 cases tentative epidural cord stimulation was done and 11 patients received implantation of a system for long-term stimulation. In most cases the epidural electrodes were implanted below the damaged segment, usually in the thoracic part of the cord. Before and after SCS beginning PEMG was done with a 16-channel Mingograph Siemens Elema with simultaneous recording of the responses from the symmetric muscles: quadriceps, semitendinous, adductor femoris, anterior tibialis and triceps surae. The effect of SCS was analysed on exteroceptive and proprioceptive reactions during testing of knee and ankle reflexes, and on the response of the muscles to vibration. In most patients a reduction was observed of the intensity of tendon reflexes, particularly the spread of the reflex to the contralateral extremity was no longer seen. The vibration reflex had a tonic character persisting in 48% of the studied muscles, even in patients with clinically complete transsection of the cord. The change of the character of monosynaptic reflexes and the presence of the vibration reflex suggest that SCS modifies the proprioceptive segmental spinal reactions.

Adult↗
PubMedDate not supplied

[Somatosensory potentials evoked by stimulation of the median nerves recorded during the operation from the surface of the cerebral cortex in patients with temporal lobe epilepsy].

Somatosensory evoked potentials obtained by stimulation of the median nerve were analysed. The potentials were recorded from 237 points of exposed cortex in 34 patients with temporal lobe epilepsy with epileptogenic focus in the left lobe in 17 cases, and in the right lobe in 17 cases. Only N 20 and P 20 responses were analysed, considering potentials with amplitude above 0.3 uV. No response was obtained from 40.7% of points on the right side, and from 48.7% points on the left. On the right side negative potentials prevailed (56.8%) and on the left side positive potentials were more frequent (32.8%). A characteristic feature of the recorded potentials was their low amplitude and shorter latency of the positive deflection in which they differed from the potentials evoked from the primary sensorimotor cortical representation of the hand. The authors put forward the hypothesis that the recorded potentials are generated by secondary sensory areas and sensory representation in the external cortex of the temporal lobes.

Adolescent↗
PubMedDate not supplied

[Physiologic all-night sleep in patients with severe forms of epilepsy].

100 all night sleep records in 90 patients with various forms of epilepsy and 10 patients with syncope were analyzed. There were 10 patients with generalized epilepsy, 41-with partial epilepsy with complex symptomatology and temporal foci, 23--with mixed seizures and frontal focal changes and 16 patients with partial epilepsy with simple seizures and various location of EEG foci. Normal sleep pattern was present in 21% of cases. The most frequent changes of sleep pattern were: prolongation of sleep onset and the latency of the first episode of REM, instability of sleep stages and absence of sleep spindles. Interictal discharges appeared mostly in all sleep stages of NREM. 50% of epileptic patients showed focal spikes in REM. Nocturnal seizures occurred in 18 patients, in several of them very frequently.

Adolescent↗