Biomedical subjects

B De Toffol

Publications and source records attributed to B De Toffol.

21 records · Page 2Linked to original sources

PubMed1990

Influence of lateralized sensorimotor and neuropsychological activities on electroencephalographic spectral power.

In order to test the effect of 'lateralized' sensorimotor and neuropsychological activities on EEG spectral power (P), we recorded EEGs over the right and left central regions with 3 different derivations C5P3/C6P4, C5Cz/C6Cz, and C5 ears-linked (EL)/C6EL in 14 young, right-handed men who underwent ten 2 min sequences including 4 during rest (3 with eyes closed (EC), 1 with eyes open (EO], and 6 during tasks reputed to involve preferentially the left (Le) or the right (Ri) hemisphere, i.e., pure left and pure right motor activity of the hand (EC), pure neuropsychological tasks consisting in lexical followed by spatial form analysis and finally mixed (neuropsychological and motor) EC tasks consisting in writing followed by left hand object recognition. Three spectral parameters P, log P and asymmetry index AI = (P Ri-P Le)/(P Ri + P Le) were calculated in 5 frequency bands theta, alpha 1, alpha 2, alpha 3 and beta 1. We observed a relationship between task complexity and P reduction on both hemispheres which was greater during rest, less during motor activity and least during mixed motor and neuropsychological activities; during EC activities more specifically involving the left hemisphere, only the comparison between rest and mixed sequences was significant. During EC activities involving the right hemisphere, both motor and mixed sequences were significantly different from rest sequences. In addition, during the EO sequences, P was usually greater than during rest. As compared to rest conditions, the AI increased during sequences preferentially involving the left hemisphere and decreased during preferentially right hemisphere activities.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1989

Insufficiency fractures of the sacrum. Ten cases and a review of the literature.

We report ten cases of insufficiency fracture of the sacrum, a recently individualized pathological entity. These fractures occur in elderly women with pronounced osteopenia of the pelvis. The clinical symptoms are low back pain and sometimes mechanical radiculalgia. Histories of previous injury are rare. In 50 per cent of the cases X-ray films of the pelvis show fractures of the anterior pelvic arch (iliopubic and ischiopubic rami). Computerized tomography or radionuclide bone scanning provide an almost certain diagnosis of sacral insufficiency fracture. This diagnosis is confirmed by a favorable clinical outcome after 2 months.

Aged↗

PubMed1987

Two distinct classifications of adult epilepsies: by time of seizures and by sensitivity of the interictal paroxysmal activities to sleep and waking.

Two hundred and thirty-six adult epileptic outpatients were classified twice: firstly according to the time of seizures reported by the patient or his family in diurnal, nocturnal, awaking and diffuse epilepsies (Es) and secondly according to the sensitivity to sleep or waking of the interictal paroxysmal activities (PA) observed during a polysomnographic night session with a sleep PA increase, with a waking PA increase, with PA indifferent to sleep and waking or with few or no PA. The stability of the sensitivity of the PA to sleep and waking was 84%. Patients with diurnal epilepsy have more frequently myoclonic attacks and a lower seizure frequency. Patients with a sleep PA increase have less frequently generalized motor seizures, more frequently partial complex seizures, a higher seizure frequency, higher total night PA density and more frequently the appearance of new PA during sleep. Patients with a waking PA increase had more frequently massive myoclonus, rarely the appearance of new PA during sleep and a high total night PA density. There is no significant relationship between the two classifications. Neither classification succeeds in discriminating the electro-clinical type of the epilepsies.

Adolescent↗