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Biomedical subjects

M Matei

Publications and source records attributed to M Matei.

At least 37 records · Page 2Linked to original sources
PubMedDate not supplied

Age-dependent amplitude variation of brain-stem auditory evoked potentials.

Normative amplitude values of brain-stem auditory evoked potential (BAEP) components are given for normally hearing subjects at 1, 10, 30, 50 and 70 years of age, with an intragroup age variation of only +/- 6 months. Under these circumstances amplitude standard deviations decreased to less than 20% of the mean values. In contrast with the reduced evolution of latency with age, BAEP amplitude (for components I-V) undergoes a greater oscillation during ontogeny. With the exception of component I, it increased markedly from 1 year to 10 years of age and decreased thereafter constantly up to 50 years, with a mean rate of 10 nV yearly. The decrease slowed down between 50 and 70 years. The amplitude differences between the subgroups are highly significant statistically (P less than 0.01). Possible reasons for these changes are discussed.

Adolescent↗
PubMedDate not supplied

Anatomo-pathologic observations on epidemic nephropathy.

Two cases of necropsy and 5 cases of renal biopuncture were studied on the occassion of an epidemic of "hemorrhagic fever with renal syndrome" identified in mountainous areas of Transylvania. The prevalent pathogenic process was capillary toxicosis which injured the renal tubules and vessels. The severity of the disease was determined by the phenomena of tubular failure, by the hemorrhagic syndrome and shock.

Adult↗
PubMedDate not supplied

The diagnostic value of interpleural lymph node biopsy.

The authors examined biopsies of the interpleural lymph nodes harvested by mediastinoscopy and hilloscopy in 162 patients (133 males and 29 females). The diagnostic efficiency is very high in sarcoidosis, silicosis and in Hodgkin's disease. In sarcoidosis biopsy is able to indicate the evolutive stage of the disease. In malignant lymphogranulomatosis all the observations belonged to type II of nodular sclerosis. In bronchial carcinoma interpleural lymph node biopsy may be practised with diagnostic purposes or in order to check up operability.

Adolescent↗
PubMedDate not supplied

Morphopathologic changes of enteropathies in 161 children's intestinal endobiopsies.

The authors examined microscopically 161 jejunal biopsies of which 142 presented a pathologic mucosa. The two sexes were equally represented and the prevalent age was between 1 and 2 years. Nearly one third of the cases were acute enteritides and the remaining ones--granulative and atrophic enteritides; none of them was hypertrophic. The causes of these enteropathies are various.

Adolescent↗
PubMedDate not supplied

Mapping of VEPs and ERG responses to punctual stimulations in the visual field.

Visual field projection maps were obtained using retinal and cortical EP amplitude values. Single meridian investigations were also performed. Stimulation was done with punctual photic stimuli delivered by the LED perimeter built for the purpose. Schedule with 28 stimulation loci was adopted. The B wave of the average ERG and P100 component of the cortical VEP were measured. The maps were obtained by interpolation of amplitude values on a grid of 21 x 21 characters. By comparing the retinal and cortical visual field maps, conclusions regarding the normality of visual structures (peripheral or central) can be drawn. Our procedure adds to the previous data on visual field investigation (cynetic or static) important elements concerning vision electrophysiology.

Brain Mapping↗
PubMedDate not supplied

[Some epidemiological indicators in bronchopulmonary cancer in Sector 5 of Bucharest (study of 525 cases)].

The incidence was studied of broncho-pulmonary carcinoma, as well as of other epidemiological indicators in the 5th district of Bucharest over a period of 14 years (1960-1973) during which a total of 525 cases have occured. The incidence in this territory tends to become real from 1967 when the curve overtook the death-rate in the country. Following a continuous increase the number of cases reached 29 0/0000 in 1973 and it is presumed that it will attain 40 0/0000 in 1980. The increase in the morbidity is due to a higher number of cases noted in the extreme age groups (the increase was 2,5-fold in those under 40 years of age); the age group which was the most seriously involved was that between 60 and 69 years, in which the morbidity was of 111 0/0000. The proportion of women has also increased, from 1/6-th to 1/5-th of the total number of cases. In women the frequency of adenocarcinoma and of non-differentiated neoplasies is somewhat higher than in men. The proportion of histopathological confirmation of the disease diminished in the last years probably due to the higher number of aged subjects that cannot be correctly investigated or surgically treated.

Adenocarcinoma↗
PubMedDate not supplied

Cerebral dysfunction revealed by EEG mapping in the schizoform epileptic psychosis.

Twenty schizophrenia-like psychotic patients suspected of epilepsy were explored using EEG techniques (recordings in the 10-20 International System, source derivation, EEG mapping and EEG spectral reaction mapping by photic and somesthetic stimulation). In 16 of them, latent epileptic disorders were found. EEG spiking foci could be located either: (a) in temporal, (b) fronto-basal, or (3) in the sagittal-line leads. A corresponding associated dysrhythmia was clearly revealed by EEG mapping. On EEG spectral reaction mapping a suggestive aberrant displacement of the area of maximal sensory response was found. These EEG disorders were in significant relation with the psychotic syndrome observed in the respective group of patients: (a) patients with fronto-basal (temporal anterior) foci were prevalently paranoid; (b) patients with temporal lobe foci were prevalently depressive; (c) patients with sagittal line (singular) foci presented a predominantly expansive, hypomanic behaviour. The study shows the importance of normal fronto-limbic circuits for the preservation of mental health.

Adult↗
PubMedDate not supplied

EEG mapping in mentally retarded children by synthetic arginine vasotocin administration.

EEG investigations (using source-derivation) were performed in 15 mentally retarded children, before, during (at 1 and 6 months) and after three months of pineal hormone treatment (AVT, 10(-6) mg/day, intranasally). Power spectral analysis, maturation lines and EEG mapping were used to ascertain the functional changes induced by AVT. A rapid increase in maturation EEG coefficients was found. It resulted from a significant reduction in the percent amount of theta and delta activity and from the increase in alpha activity. A significant increase in alpha peak frequency occurred after 6 months of treatment as well as a better separation of the EEG patterns between the anterior and posterior halves of the hemispheres. These favourable effects were clearly evidenced by EEG mapping. They are in good relation with cognitive function (attention, intelligence) improvement induced by AVT therapy.

Administration, Intranasal↗
PubMedDate not supplied

Contribution of EEG mapping to diagnosis setting in a supratentorial damage.

Forty neurologic patients were investigated in order to disclose the diagnostic advantages by power ratio EEG mapping. Typical examples of EEG maps in brain tumours, cerebral infarction, encephalitis and epilepsy are given. In spite of obvious limitations, the necessity of EEG mapping utilization in the neurological clinic is supported.

Adult↗
PubMedDate not supplied

Alterations in brain-stem auditory responses induced by head down tilting in hypertensives with supine brain-stem disorders.

The influence of head down (HD) tilting on brain-stem auditory evoked responses (BAER) was studied in hypertensives with supine brain-stem disorders (occipital headache, vertigo, nausea, diplopia, blurred vision occurring after night recumbency), in hypertensives without such phenomena and in normotensives. In the latter two categories of subjects HD tilting had no effect on BAER. On the contrary, in hypertensives with supine brain-stem disorders the manoeuvre induced a constant prolongation of I-V and III-V intervals and a depression in the amplitude of wave V; the alterations of BAER produced by HD tilting reveal probably a dysfunction of the superior brain-stem area and might be due to the impaired cerebral venous draining subsequent to the manoeuvre. The study of BAER after HD tilting seems to be a proper means to attest the supine brain-stem disorders displayed by some hypertensives.

Brain Ischemia↗