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Query: UMLS:C0015672 (fatigue)
 51,768 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Physical fatigue is a painful phenomenon which is localised in overstressed muscles. Mental fatigue is a diffuse sensation of weariness; it is a functional state, one of several intermediate conditions between the two extremes of alarm and sleep. A neurophysiological model of fatigue, involving an activating and inhibitory system has been developed. Fatigue in industrial practice has clinical symptoms: psychic instability, fits of depression and increased liability to illness. Indicators of fatigue are work of performance, subjective feelings of fatigue, electroencephalography, flicker-fusion frequency and various psychomotor and mental tests. Several field studies do, to some extent, confirm the above-mentioned concept of fatigue.
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PMID:Fatigue in industry. 4 Sep 99

The author describes a family (48 year old mother and 15 year old son) with the muscular variant of glycogenosis-McArde's metabolic myopathy. The mother has been ill since 22 years old, the son--since 7. The disease had a slowly progressive development. The clinical picture was characterized by convulsions of the type of cramps following physical loadings on muscles of the body and extremities. Convulsions were accompanied by pain, an induration and enlargment of the muscles, muscle fatigue and increased significantly in an artifical ischemia of the extremities. A histochemical study of the muscle revealed a pathological accumulation of glycogen. The content of lactic and pyruvic acid in the blood after work in ischemic conditions did not change significantly. A study of the sugar curve in the blood with a loading with glucose and a parallel determination of insulin by a radioimmune method found hyperinsulinemia and a dysfunction of the pancreas.
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PMID:[McArdle's disease (a familial case)]. 106 64

Carbon monoxide (CO) poisoning is the commonest single cause of fatal poisoning in the U.K. (Broome & Pearson, 1988). The clinical features are numerous and include headache, fatigue, dizziness, confusion, memory loss, paraesthesia, chest pain, abdominal pain, nausea, and diarrhoea as well as coma, convulsions and death. Without adequate treatment many patients develop neuropsychiatric sequelae including headaches, irritability, memory loss, confusion and personality changes. The diagnosis of CO poisoning is often suggested only by circumstances surrounding the victim, and remains a challenge to the A&E department. Hyperbaric oxygen therapy (HBO) is internationally accepted as the most powerful form of treatment in severe cases (Drug & Therapeutics Bulletin, 1988; Lowe-Ponsford & Henry, 1989). However, in the U.K. treatment with HBO is often not considered due to lack of hyperbaric facilities (Meredith & Vale, 1988; Anand et al., 1988), and due to inadequate awareness on the part of hospital staff. We report a case of a patient deeply unconscious as a result of CO poisoning, in which serial treatments with HBO over a period of 14 days, produced dramatic results.
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PMID:Management of the moribund carbon monoxide victim. 811 Mar 42

We describe the unusual clinical course in a case of exanthema subitum with affection of the liver and central nervous system in a 10-months-old girl. HHV-6 infection was confirmed serologically (positive HHV-6 IgM from 10th to 29th day, increasing IgG-titres). At the beginning of the illness convulsions with preference to the right side were noticed, which were consistent with an encephalitis (on top to a suspected pre/perinatal lesion) and resulting in spastic triplegia. Nuclear magnetic resonance imaging and cranial computertomographic results showed severe, predominantly left-sided cerebral lesions. In addition there was clinical and biochemical evidence of an associated hepatitis. Human herpesvirus-6 has been identified as the cause of exanthema subitum. In addition, the virus is known to cause other clinical entities (lymphadenopathy, febril seizures, hepatitis, postinfectious chronic fatigue a.o.) and has been identified in brain tissues. Our observations show that the course of exanthema subitum can be complicated by affection of the liver and central nervous system. At present it is impossible to estimate the clinical outcome in our patient.
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PMID:[Exanthema subitum, encephalopathy and hepatitis caused by human herpesvirus type 6 (HHV-6) in a 10-month-old infant]. 165 45

We have developed an ambulatory recorder capable of monitoring low back muscle tension, trunk motion, and ratings of pain and fatigue. It weighs 22 ounces, fits into a canteen belt, and records every second for 18 hours. Eleven subjects wore the recorder during all walking hours for between 3 and 5 days. Six subjects had chronic low back pain due to muscle tension, three experienced low back pain after labor, and two had no pain. Movement and muscle tension correlated highly when subjects were pain free but not when they were in pain. Muscle tension increased before pain was experienced.
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PMID:Development of an ambulatory recorder for evaluation of muscle tension-related low back pain and fatigue in soldiers' normal environments. 182 44

The intent of this paper is to review the recent literature on exercise-induced hyperammonemia (EIH) and to compare the current interpretations of ammonia accumulation during exercise with the recognized clinical symptoms of progressive ammonia toxicity. In doing so, we will speculate on possible exercise-induced symptoms of CNS dysfunction which could result from elevated ammonia during intense short-duration or prolonged exercise. Ammonia is a ubiquitous metabolic product producing multiple effects on physiological and biochemical systems. Its concentration in several body compartments is elevated during exercise, predominantly by increased activity of the purine nucleotide cycle (PNC) in skeletal muscle. Depending on the intensity and duration of exercise, muscle ammonia may be elevated to the extent that it leaks (diffuses) from muscle to blood, and thereby can be carried to other organs. The direction of movement of ammonia or the ammonium ion is dependent on concentration and pH gradients between tissues. In this manner, ammonia can also cross the blood-brain barrier (BBB), although the rate of diffusion of ammonia from blood to brain during exercise is unknown. It seems reasonable to assume that exhaustive exercise may induce a state of acute ammonia toxicity which, although transient and reversible relative to disease states, may be severe enough in critical regions of the CNS to affect continuing coordinated activity. Regional differences in brain ammonia content, detoxification capacity, and specific sensitivity may account for the variability of precipitating factors and latency of response in CNS-mediated dysfunction arising from an exercise stimulus, e. g., motor incoordination, ataxia, stupor. There have been numerous suggestions that elevated ammonia is associated with, or perhaps is responsible for, exercise fatigue, although evidence for this relies extensively on temporal relationships. Fatigue may become manifest both as a peripheral organ or central nervous system phenomenon, or combination of both. Thus, we must examine the sequential or concomitant changes in ammonia concentration occurring in the periphery, the central nervous system (CNS), and the cerebrospinal fluid (CSF) induced by any effector, not only exercise, to interpret and rationalize the diverse physical, physiological, biochemical, and clinical symptoms produced by hyperammonemic states. Since more is known about elevated brain ammonia during other diverse conditions such as disease states, chemically induced convulsion, and hyperbaric hyperoxia, some of these relevant data are discussed.
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PMID:Exercise-induced hyperammonemia: peripheral and central effects. 219 91

A 49-year-old man with a one-week history of general fatigue and several other symptoms, including hematuria, numbness of the mouth, anemia and thrombocytopenia, was admitted because of an episode of convulsions and unconsciousness after blood transfusion. A diagnosis of thrombotic thrombocytopenic purpura (TTP) was then made, and treatment with steroids, anti-platelet agents, transfusion of fresh frozen plasma was started. However, since no improvement was seen, on the third day of admission, treatment with plasma exchange was instituted (total plasma exchange volume was 18.1 iota), and his clinical and hematological conditions improved markedly. Since then, he has been in a remission state for about three years. Laboratory examinations during the acute phase showed increase of vWf: Ag, decrease of RCof/vWf: Ag, increase of vWf large multimers and a high endothelial cell injury activity by the patient's serum. In the next day following the plasma exchange therapy, RCof/vWf: Ag improved, but not to the normal range. One and a half years later, while in the remission phase, the vWf multimers and endothelial cell injury activity normalized. Thus, these findings show further evidence on the involvement of endothelial cell injury and vWf in the pathogenesis of TTP.
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PMID:[Thrombotic thrombocytopenic purpura which was effectively treated by plasma exchange therapy--involvement of vWF and endothelial cell injury]. 262 4

We studied the antiepileptic potency of vigabatrin (gamma-vinyl GABA, GVG) as an open trial in a group of 36 mentally handicapped patients with drug-resistant epilepsy (30 had seizures of partial onset and 6 had primary generalized [PG] tonic-clonic convulsions). With this treatment, 13 (43%) of the patients with seizures of partial onset and 2 (33%) with PG had more than 50% reduction in seizure frequency. The antiepileptic effect appeared during the first month of therapy and continued throughout the 7-month study. The side effects were mild: tiredness, aggressiveness, and ataxia. Other antiepileptic drugs remained at baseline levels during GVG therapy. GVG did not alter EEG recordings. Our results suggest that GVG is effective for treatment of intractable epilepsy, especially the partial type, in mentally retarded patients. Longer follow-up is needed, however, to determine that the clinical effect is maintained and that no severe side effects appear.
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PMID:Effect of vigabatrin on epilepsy in mentally retarded patients: a 7-month follow-up study. 336 72

This chapter has reviewed some of the methodological and theoretical issues in research linking the social environment to medical illnesses. The second part of the chapter has focused on three specific neurological entities to examine evidence for a possible association between neurological illness and life stress. There is some suggestion that certain vulnerable epileptic patients can experience convulsions in response to acute emotional upheaval or certain types of cognitive challenges. More commonly, it is probable that social stress and emotional tension can produce lowering of seizure threshold by increasing levels of fatigue and disrupting sleep. The latter factor, in particular, is known to lower seizure threshold. In the case of stroke, several dramatic cases of intracranial hemorrhage have been related to disastrous life circumstances. A general association between life stress and stroke has yet to be established. The case for a link between life events and onset of exacerbation of multiple sclerosis seems stronger. Events which produce emotional upset seem capable of worsening symptoms in patients with existing disease, and several studies have reported unusual life stresses in the period preceding onset of symptoms in this disorder.
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PMID:The social environment and neurological disease. 389 69

This paper describes the psychophysical training of crewmembers of flying vehicles who may find it necessary to cross a water boundary or to remain for long in water after emergency splash-down. In order to prevent attacks of fear and panic caused by such frightful things as whirlpools and convulsions the paper presents data on the nature of turbulent processes in running water and the techniques of overcoming them as well as on the origin of convulsions in swimmers and methods of their alleviation. The paper also describes an easy method of how to have a rest when swimming that makes it possible to eliminate the feeling of fatigue by remaining motionless for an infinitely long time.
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PMID:[One aspect of training aircraft crews]. 405 34


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