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Query: UMLS:C0011570 (depression)
 172,036 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Violence is a symptom of an underlying mental state such as a psychosis, a characterological problem, or brain dysfunction. Thus drugs used to treat aggression in man exert effects by their specific pharmacological actions (e.g., antipsychotic, anticonvulsant). Most literature to date has dealt with animals and human models of aggression and lacks conceptual clarity. Aggression differs from depression, a coherent clinical entity, in its etiological diversity and its paroxysmal or impulsive basis, and this may account for the relationship seen in literature linking violence to epilepsy; yet literature on anticonvulsants is equivocal with regard to beneficial effects on aggression. Lithium has been shown to have positive effects, although its mode of action is unclear. A variety of antipsychotic agents and minor tranquilizers have been mentioned. Central nervous system stimulants have been found useful to treat hyperkinetic syndromes in both children and adults where aggression is a symptom. Hormonal agents are discussed. Drug treatment of aggression should not obscure the need for verbal therapies, and social and environmental factors should always be regarded.
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PMID:Conceptual issues in the use of drugs for the treatment of aggression in man. 23 9

A model for differentiating cerebral dysfunction in senile, arteriosclerotic dementia, and depressive states is proposed on the basis of electrocortical topographic measures of EEG coherence. Bipolar EEGs were recorded from central, parietal, occipital and temporal areas in 24 elderly patients with a firm clinical diagnosis of senile dementia, senile arteriosclerosis or depression. Power and coherence spectra were computed on 20 second epochs recorded during eyes open, eyes closed and photic stimulation. Significant group differences were reported in both power and coherence measures. Power results were uniform for all channels but coherence values differed significantly with derivation. The best discriminator between groups was EEG coherence estimates between right parietal and temporal derivation. Correlations between clinical symptomatology and EEG coherence supported the direction of the discrimination between groups. The EEG coherence function is discussed as a potential measure of neuro-functional pathology in psychiatry.
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PMID:The EEG and differential diagnosis in psychogeriatrics. 49 18

Recent experimental data are summarized about changes in the functioning of calcium ion channels in clonal cellular lines (pheochromocytoma PC12) and hippocampal neurons of newborn rats on the background of altered intracellular level of aromatic amino acid L-tyrosine or its precursors L-phenylalanine. Elevation of the level of L-phenylalanine persistently down-regulated the high-threshold voltage-operated calcium channels in both types of cells without affecting the low-threshold ones in hippocampal neurons. This depression could be to some extent reversed by elevation of the level of L-tyrosine. Thus both amino acids seem to exert a long-lasting antagonistic modulatory effect on the corresponding channels, mediated probably through changes in tyrosylation of some cytoskeletal proteins. The participation of these molecular mechanisms in brain dysfunction during congenital disease phenylketonuria is suggested.
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PMID:[Possible molecular mechanisms of brain dysfunction in phenylketonuria]. 130

Bit-mapped multicomponent CNV complex and reaction time (RT) were recorded and measured in 24 presenile patients with initial symptoms of very mild to moderately severe primary mental deterioration without depression, and in 10 age-matched controls. All patients underwent CT and MRI examinations, EEG spectral analysis and a battery of psychometric test. Significant group differences were obtained for measures of some post-S1 ERP and CNV components, particularly of the post-S1 N1b, P300 and early and late pre-S2 CNV. P300 with increased latency, no significant CNV activity, very prolonged RTs, EEG slowing down and diffuse brain atrophy were observed in the majority of patients with probable presenile Alzheimer's dementia. These results suggest that CNV/RT and EEG activity changes similar to those observed in our patients may constitute a valuable clue for the study of brain dysfunction in the early stage of presenile idiopathic cognitive impairment.
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PMID:Effect of physiological and pathological aging processes on topographic bit-mapped cognitive evoked potentials in presenile subjects. 180 55

In a case series study we evaluated 53 composite-materials workers in an aerospace plant who filed workers' compensation claims for illness allegedly related to phenol-formaldehyde resin exposure. Symptoms ranged from mucosal and skin irritation to depression and cognitive impairment. Certain health practitioners implying they had immunologic dysfunction and organic brain injury, led workers to believe they were chemically poisoned. Industrial hygiene evaluation failed to show levels of chemicals above permissible levels. Thorough evaluation by our multidisciplinary panel failed to find significant objective abnormalities by physical exam and laboratory testing. Thirty-nine percent of the workers had sensory irritation and/or skin complaints that generally resolved rapidly with removal from exposure. Psychiatric diagnoses (including major depression and/or panic attacks) were made in 74% of the workers, but only 26% of these had antecedent disease. Fourteen (26%) had multiple somatic complaints that generally persisted despite removal from exposure, but they also had long histories of significant pre-existing psychological illness. Detailed neuropsychologic testing failed to show any definite evidence or organic brain dysfunction in any of the workers tested. We speculate that sensory irritation from low-level volatile organic compounds with autonomic arousal, reinforced by the belief they were "chemically poisoned," led to psychogenic illness.
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PMID:Depression and panic attacks related to phenol-formaldehyde composite material exposure in an aerospace manufacturing plant. 183 99

1. It has been established that chronic hyperammonaemia, whether caused by portacaval shunting or other means, leads to a variety of metabolic changes, including a depression in the cerebral metabolic rate of glucose (CMRGlc) increased permeability of the blood-brain barrier to neutral amino acids, and an increase in the brain content of aromatic amino acids. The preceding paper [Jessy, DeJoseph & Hawkins (1991) Biochem. J. 277, 693-696] showed that the depression in CMRGlc caused by hyperammonaemia correlated more closely with glutamine, a metabolite of ammonia, than with ammonia itself. This suggested that ammonia (NH3 and NH4+) was without effect. The present experiments address the question whether ammonia, in the absence of net glutamine synthesis, induces any of the metabolic symptoms of cerebral dysfunction associated with hyperammonaemia. 2. Small doses of methionine sulphoximine, an inhibitor of glutamine synthetase, were used to raise the plasma ammonia levels of normal rats without increasing the brain glutamine content. These hyperammonaemic rats, with plasma and brain ammonia levels equivalent to those known to depress brain function, behaved normally over 48 h. There was no depression of cerebral energy metabolism (i.e. the rate of glucose consumption). Contents of key intermediary metabolites and high-energy phosphates were normal. Neutral amino acid transport (tryptophan and leucine) and the brain contents of aromatic amino acids were unchanged. 3. The data suggest that ammonia is without effect at concentrations less than 1 mumol/ml if it is not converted into glutamine. The deleterious effect of chronic hyperammonaemia seems to begin with the synthesis of glutamine.
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PMID:Hyperammonaemia does not impair brain function in the absence of net glutamine synthesis. 187 6

The relationship between depression and dementia is complex. Transient emotional disturbances and long-lasting depressive disorders may occur as psychological reactions to the loss of mental abilities or as behavioural manifestations of brain injury. On the other hand, major depressive disorder of late onset or of a recurrent type may be superimposed on dementing illness. Depression, particularly in elderly individuals, can manifest itself as a reversible syndrome of dementia that responds favourably to antidepressant treatment. It is not known whether the dementia syndrome of depression represents a quantitative intensification of minor cognitive impairments that can be observed in a large proportion of depressed patients. It also remains doubtful whether dementia in depressed patients has to be considered as an epiphenomenon of pervasive melancholic illness. An alternative explanation would look at such conditions as manifestations of a specific brain dysfunction. Major depression associated with cognitive impairment in stroke patients might be regarded as an example of a reversible dementia dysfunction.
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PMID:Depressive disorders and dementia: the clinical view. 189 74

Technical advances in surgery and the new antirejection agents cyclosporine and muromonab-CD3 have led to improved outcome for organ transplantation. Allograft rejection and complications of immunosuppressant therapy are often associated with considerable stress, so availability of psychiatric consultation is a necessity. As a transplant team consultant, the psychiatrist treats perioperative anxiety, depression, and organic brain dysfunction and addresses medical and ethical aspects of patient selection. Studies indicate that many patients with psychopathological conditions have good postoperative results and that most living kidney donors participate spontaneously and consider donation a positive experience.
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PMID:Psychiatric aspects of organ transplantation. 266 27

Neurologic and psychologic studies were done on 16 victims of alternate current electrical injuries. The patients were followed for a period of over 5 years. The findings point to a stereotyped generalized cerebral dysfunction, resulting in depression, divorce, unemployment as well as a high incidence of atypical seizures (atonic and myoclonic seizures). The EEG and CT studies were nondiagnostic. Evoked potentials revealed abnormalities in the upper cervical spinal cord and lower brain stem regions, raising the possibility that the epileptogenic focus was too deep to be recorded by standard surface EEG recording. The fact that the electrical injury patients have a high incidence of severe emotional disturbance and post-traumatic depression along with atypical seizures, in the face of nondiagnostic EEG and CT studies, may result in improper management of such patients.
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PMID:The neurophysiological aspects of electrical injuries. 270 89

Imprecise diagnosis of birth asphyxia coupled with uncertainties about causal factors for neurologic abnormalities in the newborn have greatly fueled the current litigation crisis in obstetrics. Our goal was to more precisely define birth asphyxia based on fetal condition as measured by umbilical artery blood pH, Apgar scores, and neurologic condition of newborns. We selected for study 2738 patients with singleton pregnancies with cephalic presentations who were delivered of infants at term to avoid complications such as prematurity, which may affect infant outcome independent of birth condition. The basis for study of these particular patients were defined criteria for high risk and an indicated arterial cord pH value. A total of five infants demonstrated cerebral dysfunction as evidenced by seizures during the neonatal period. Infection was linked to seizures in three of these infants; one infant had neonatal asphyxia and only one infant's clinical course could be attributed solely to birth events (uterine rupture). Stratification of umbilical artery blood pH values, Apgar scores, and combinations of these dependent variables in relation to newborn clinical outcomes revealed that infants must be severely depressed at delivery before birth asphyxia can be reliably diagnosed. Such depression includes Apgar scores less than or equal to 3 at 1 and 5 minutes plus umbilical artery pH values less than 7.00.
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PMID:Diagnosis of birth asphyxia on the basis of fetal pH, Apgar score, and newborn cerebral dysfunction. 278 67


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