Biomedical subjects

J V Partanen

Publications and source records attributed to J V Partanen.

6 recordsLinked to original sources

PubMed1987

Biochemical and clinical studies on epileptic patients during two phase I trials with the novel anticonvulsant taltrimide.

Taltrimide (2-phthalimidoethanesulphon-N-isopropylamide), a lipophilic derivative of taurine and a potent anticonvulsant in animal studies, was administered in daily doses of 1 and 2 g for 2 weeks with an interval of 2.5 months in 2 phase I clinical trials to 9 drug-resistant epileptic patients. Seizures and EEG were recorded, and routine laboratory studies conducted. Concentrations of antiepileptic drugs in plasma, of amino acids in urine and plasma, and contents of amino acids, homovanillic acid (HVA), 5-hydroxyindoleacetic acid (5-HIAA) and cyclic nucleotides in the cerebrospinal fluid were determined. Although no clinical or neurophysiological effects were observed, an increase in the cerebrospinal fluid contents of HVA and cyclic nucleotides and changes in the concentrations of antiepileptic drugs and amino acids were found. The concentrations of HVA correlated with those of 5-HIAA and also with those of the main active metabolite of taltrimide. Biochemical changes due to taltrimide treatment resembled only partly those found after taurine treatment.

Adult↗

PubMed1986

Does an ACTH derivative (Org 2766) prevent deterioration of EEG in Alzheimer's disease?

Seventy-seven patients with Alzheimer's disease were submitted to a double-blind no cross-over study of the effect of a synthetic ACTH4-9 analog (Org 2766) on the EEG. The quantitative EEG power spectrum analysis with 22 Org 2766 and 22 placebo treated patients showed no improvement which could be related to the Org 2766 medication (6 months, 40 mg daily), either comparing the successive EEG sessions or comparing the drug treated group with the placebo treated group. The placebo treated group showed a decrease of power in the beta band after 4 and 6 months and an increase of theta after 6 months, which is regarded as a sign of deterioration of the EEG in advancing disease. These changes did not occur in the Org 2766 treated group. However, a subgroup analysis of 9 Org 2766 treated patients and 9 placebo treated patients without other CNS drugs during the study did not reveal consistent differences between the groups after 4 and 6 months of therapy. We believe that Org 2766 does not have a long-term protecting effect on the EEG.

Adrenocorticotropic Hormone↗

PubMed1985

Quantitative analysis of occipital EEG in different stages of Alzheimer's disease.

EEG frequency analysis by Fast Fourier Transform (FFT) was studied in different stages of Alzheimer's disease (AD), defined according to the neuropsychological test score. It was observed that in mild AD the percentage power of the theta band, the ratio of powers in the alpha and theta bands and the mean frequency (range 1.46-20.02 c/sec) differed significantly from the old healthy controls. The percentage power of the alpha band, the occipital peak frequency and the ratio of powers in the alpha and delta bands decreased linearly in different stages of AD. These variables did not differ significantly in mild AD from the control values. Distinct slowing of the occipital peak frequency and distinct accentuation of the percentage power of the delta band occurred in advanced AD. Slowing of the dominant occipital rhythm and accentuation of the diffuse irregular slow waves, which are usually regarded as the main EEG criteria for AD, do not describe mild but advanced disease.

Aged↗

PubMedDate not supplied

The influence of height, age and gender on the interpretation of median nerve SEPs.

Median nerve SEPs were studied in 120 normal subjects. Highly significant correlations with height and age were found for all SEP peak latencies, but not for the interpeak latency N19-N13. A significant gender difference was found for N13 and N19 peak latencies, the males having longer latencies. No sex-related correlations in central conduction time could be shown. It is emphasized that reliable SEP interpretation should include simultaneous height, age and gender corrections.

Adult↗

PubMedDate not supplied

Pattern-reversal VEP and cortical SEP latency prolongations in epilepsy.

Twenty ambulatory outpatients with generalized tonic-clonic seizures with primary generalized discharges and photoconvulsive response on electroencephalogram (EEG) and 11 ambulatory outpatients with partial complex seizures with or without secondary generalization were studied with pattern-reversal light-emitting diode (LED) stimulator visual evoked potential (VEPs) and short-latency median nerve cortical somatosensory evoked potentials (SEPs). The patients with primary generalized epilepsy had significantly prolonged latencies of VEP components P2 and N3 and SEP component P22. The patients with partial epilepsy had significantly prolonged latency of VEP component N3. It is concluded that both functional and structural factors may cause a slowing of central impulse conduction.

Adolescent↗

PubMedDate not supplied

Visual evoked potentials, brainstem auditory evoked potentials, and quantitative EEG in Baltic progressive myoclonus epilepsy.

Visual and brainstem auditory evoked potentials (VEP and BAEP, respectively) and quantitative EEG were studied in 16 patients with Baltic progressive myoclonus epilepsy (PME). The study demonstrated significantly delayed VEP latencies but normal amplitudes in Baltic PME. BAEPs showed slight but significant prolongation in central conduction time. Quantitative EEG revealed diminution of beta and alpha activity and accentuation of theta and delta activity. The slowing in VEP latencies is suggested to be due to impaired synaptic transmission and to reflect dopaminergic dysfunction in Baltic PME. We conclude that there is a multimodal disturbance in sensory projections to cortical areas in Baltic PME. The results give further evidence that nondemyelinating disorders--but with synaptic transmission defects--can produce changes in evoked potentials. The changes in epileptic brain are not confined to hyperexcitable epileptic neurons, but more widespread electrophysiological phenomena are produced.

Adolescent↗