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Biomedical subjects

M Trimble

Publications and source records attributed to M Trimble.

59 records · Page 4Linked to original sources
PubMed1977

The relationship between epilepsy and schizophrenia: a biochemical hypothesis.

There has been much controversy in the past surrounding the relationship between schizophrenia and epilepsy. One hypothesis has been that the two disorders are antagonistic. The evidence supporting the antagonism hypothesis is briefly reviewed. A new theory based on current knowledge of the relationship of dopamine to both disorders is postulated which may explain the relationship between the psychosis and epilepsy which occurs in a subgroup of schizophrenic patients. In the light of this hypothesis it is suggested that further clinical work be undertaken to clarify further the exact association between the two disorders.

Amphetamines↗
PubMed1976

Anorexia nervosa after the menopause.

A patient is described who developed the classical syndrome of anorexia nervosa at the age of 52. Her illness occurred in relation to the marriages of her daughters and showed an extreme preoccupation with her body shape and a determination to slim by diet, purging and vomiting, and the hiding of food to the extent of rendering herself too weak to cope with the demands of her life. It is suggested that anorexia nervosa, though predominantly a disease of onset in adolescence, may present at any age and should be considered in the differential diagnosis of anorexia in patients over the age of 50.

Anorexia Nervosa↗
PubMed1975

Photically induced epilepsy in Papio papio as a model for drug studies.

Neurophysiological studies employing drugs have been undertaken in the natural syndrome of photically induced epilepsy in the Senegalese baboon Papio papio. GABA-mediated inhibition, both pre- and posysynaptic, plays an important role in the epileptic manifestations seen in this syndrome synapses can significantly modify photically induced epileptic responses, partly as a result of changes in afferent activity. The level of activity in dopaminergic systems can also modify the epileptic signs. Among anticonvulsant drugs, barbiturates and benzodiazepines are very effective against this type of epilepsy, whereas many other drugs are weakly active or toxic. A modification of the natural model (using allylglycine as a priming agent) is convenient for correlating acute anticonvulsant activity and neurological toxicity with plasma concentrations of anticonvulsant agents.

Acetylcholine↗
PubMedDate not supplied

Drugs modifying dopaminergic activity and behaviour, the EEG and epilepsy in Papio papio.

Acute changes in spontaneous motor activity, the EEG and photically induced epileptic responses have been observed in baboons (Papio papio) following the i.v. injection of drugs acting on dopaminergic transmission. Apomorphine hydrochloride, 0.5-1.0 mg/kg, produced a phase of acute excitement with accentuated vigilance and abnormal buccal motor activity lasting 30-40 min; during this phase myoclonic responses to intermittent photic stimulation were absent. After piribedil (ET 495, 1,2'' -pyrimidyl-4-piperonylpiperazine), 2-10 mg/kg, acute excitement was not seen. Intermittent delta activity was prominent in the EEG for 1-3 hr, and was associated with a slight reduction in photically induced epileptic responses. Haloperidol 0.6-1.2 mg/kg, produced a long-lasting reduction in spontaneous motor activity with an increased incidence of spontaneous EEG spikes and waves and a great enhancement of paroxysmal EEG activity during photic stimulation. Pimozide, 0.5-2.5 mg/kg, normally produced mild sedation and some EEG slowing. 2 animals responded idiosyncratically to both haloperidol and pimozide, displaying intermittent dystonic episodes with bucco-facial dyskinesia. These findings suggest that activation of dopaminergic receptors can lead to a reduction in myoclonic responses to photic stimulation.

Allyl Compounds↗