Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0011570 (depression)
 172,036 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. Single fibres isolated from the anterior tibialis muscle of Rana temporaria (temperature, 2-5 degrees C; sarcomere length, 2.10 microns) were fatigued using two separate protocols that led to different degrees of depression of tetanic force. Under control conditions the fibre was stimulated to produce a 1 s fused isometric tetanus at 300 s intervals. A moderate degree of fatigue (tetanic force reduced to 70-80% of the control value) was produced by decreasing the intervals between tetani to 15 s ('fatiguing protocol 1'). A more pronounced depression of tetanic force (to 40-50% of the control value) was produced by evoking a single twitch at 1-2 s intervals ('fatiguing protocol 2'). 2. Fatiguing protocol 1 reduced the contracture response to submaximal and supramaximal concentrations of caffeine (3-15 mM) in proportion to the decrease in tetanic force. These results support the view that fatiguing stimulation according to protocol 1 leads to a true 'myofibrillar fatigue' with no failure of activation of the muscle fibre. 3. Fatiguing protocol 2 reduced the amplitudes of isometric twitch and tetanus to below 10 and 50% of the control values, respectively. By contrast, the maximal contracture response to caffeine (15 mM) was depressed by merely 2-3% of its prefatigue value. 4. Force and instantaneous fibre stiffness were recorded simultaneously during twitch and tetanus as fatigue was induced by protocol 2. During the initial part of fatigue (tetanic force reduced by 25% of control) stiffness was reduced by merely 9% in accordance with previous measurements during fatigue induced by protocol 1. However, with further depression of twitch and tetanus by protocol 2 there was a marked reduction of fibre stiffness. These results, together with the findings reported under point 3, strongly suggest that at an advanced state of fatigue induced by protocol 2 the decrease in active force is largely due to failure of activation of the contractile system. 5. Muscle fibres were quickly frozen for electron microscopical examination after shortening below slack length (to approximately 1.6 microns sarcomere spacing) during tetanic stimulation. In non-fatigued fibres, and in fibres fatigued according to protocol 1, the myofibrils exhibited a straight appearance throughout the preparation suggesting that the entire volume of the fibre was properly activated. In fibres fatigued by protocol 2, on the other hand, only the most peripheral layers of myofibrils remained straight after shortening, whereas the centre of the fibre showed marked waviness indicating failure of the inward spread of activation in this case.
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PMID:Myofibrillar fatigue versus failure of activation during repetitive stimulation of frog muscle fibres. 129 47

This study was designed to evaluate the reproducibility, validity and responsiveness of a health-related quality of life (HRQOL) battery that was assembled for the evaluation of antidepressant therapy. The Montgomery-Asberg Depression Rating Scale was used to measure severity of depression. The HRQOL battery contained measures of energy and fatigue, social behaviour, cognitive function, home and work role function, and general well-being (i.e., health perceptions, life satisfaction) selected from previously developed and validated instruments. The clinical investigators and research nurses reported on difficulty in using the HRQOL battery. Most patients were able to complete the questionnaire without problems within 10 min. Reproducibility was very good with intraclass correlation coefficients ranging from 0.74 to 0.97. The HRQOL scales showed evidence of good concurrent validity. The scales were moderately correlated with MADRS scores (r = 0.30-0.62). The magnitude of these correlations indicate that HRQOL scales are related to depression measures, but they are not alternative measures of depression. Changes in MADRS scores were associated with changes in all scales, except for work behaviour, indicating that improvements in depression ratings also resulted in improvements in health status and well-being. The HRQOL scales included in this study were found to be reliable, reproducible, and valid and no appreciable burden was placed on patients or investigators participating in the study. With the exception of the Work Behaviour scale, the HRQOL scales were very responsive to changes in depression severity. This brief HRQOL instrument can provide a comprehensive assessment of the outcomes of antidepressant treatment.
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PMID:Reliability and validity of a health-related quality of life battery for evaluating outpatient antidepressant treatment. 129 57

This study compared the mental health of 12 mothers who had infants with colic to 12 mothers of infants without colic. Colic was defined as infant fussing/crying of at least 2 hours/day for at least 5 out of 7 days, infant cry high-pitched and pain-sounding, and maternal report of infant inconsolability. Mental health was operationalized as scores on the Profile of Mood States and the Symptom Checklist-90R. Mothers of infants with colic had multidimensional psychological distress; they reported more bodily dysfunction, fears, disordered thinking, depression, anxiety, fatigue, hostility, impulsive thoughts and actions; and they had stronger feelings of personal inadequacy or inferiority. Implications for nursing research and practice are discussed in the context of study findings.
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PMID:Infant colic and maternal mental health: nursing research and practice concerns. 130 32

Panic attacks occur more often in females than males with onset usually in the late 20s. A 27-year old woman who experienced a panic attach (heart palpitations, fatigue, bodily shaking, labored breathing, and feelings of terror and being out of control) after she stopped taking a combined oral contraceptive (COC) (.5 norgestrel and .05 mg ethinyl estradiol) was admitted to Osaka Medical College in Takatsuki, Japan. She experienced depression at 18 and took limited amounts of antidepressants for only 1 year. When she started taking the COC at 27, she experienced feelings of unreality and fear, hyperventilation, and heart palpitations. Laboratory results showed lower than normal levels of plasma luteinizing hormone (LH) and follicle stimulating hormone (FSH) and a low estradiol level. Yet the plasma cortisol level was much high than normal (22.5 mcg/d1 vs. 3-15.2 mcg/d1). Administration of 200 mg sulpiride/day and 1.2 mg alprazolam/day alleviated almost all symptoms. She did experience mild phobic avoidance and anxiety, however. After successful treatment in the hospital, she discharged herself. Because she was concerned that the panic attacks would recur, she was provided with information on her disorder. She agreed to continue the medication. 1 possible explanation for this case is rapid endocrinological change induced by the ingestion and stopping of the COC which in turn induced a sympatho-adrenal response (her high cortisol levels) to several simple physiological stimuli. Another possible explanation is the COC induced rapid endocrinological changes that may have brought on an anxiotropic effect in someone who had earlier experienced depression.
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PMID:A case of panic disorder induced by oral contraceptive. 131 8

Between 1978 and 1987, 1270 patients who survived single aortic or mitral valve replacement at the Rehabilitation Center in Bad Krozingen, Germany, underwent a comprehensive rehabilitation program. The preoperative diagnosis was isolated aortic stenosis in 425, isolated aortic regurgitation in 159, mixed aortic lesion in 211, isolated mitral stenosis in 208, isolated mitral insufficiency in 137 and mixed mitral lesion in 130 cases. Follow up examinations were carried out one and six months after surgery, and at yearly intervals thereafter. Exercise testing was performed with an electrically braked bicycle ergometer in the supine position, and the load was increased by 25 or 50 watts every two minutes until fatigue, severe angina, more than 0.3 mV ST-segment depression, or 80% of the age predicted maximum heart rate was achieved. Patients after aortic valve replacement had a better exercise performance one month after operation than did those after mitral valve replacement. Those with mitral stenosis showed more severe impairment of exercise tolerance than did the mitral insufficiency group. There was a steady increase in exercise tolerance between one and six months postoperatively, both in patients with aortic and those with mitral valve replacement, but the difference in performance between the two groups was still present (72% versus 57% of normal). The results of univariate and multivariate analyses showed that the preoperative employment status was the most important factor for postoperative return to work, followed by gender (male > female), exercise tolerance and valualar lesion (aortic > mitral).(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Exercise tolerance and working capacity after valve replacement. 134 26

We tested a theoretical prediction that patterns of excitatory input activity that consistently fail to activate target neurons sufficiently to induce synaptic potentiation will instead cause a specific synaptic depression. To realize this situation experimentally, the Schaffer collateral projection to area CA1 in rat hippocampal slices was stimulated electrically at frequencies ranging from 0.5 to 50 Hz. Nine hundred pulses at 1-3 Hz consistently yielded a depression of the CA1 population excitatory postsynaptic potential that persisted without signs of recovery for greater than 1 hr after cessation of the conditioning stimulation. This long-term depression was specific to the conditioned input, ruling out generalized changes in postsynaptic responsiveness or excitability. Three lines of evidence suggest that this effect is accounted for by a modification of synaptic effectiveness rather than damage to or fatigue of the stimulated inputs. First, the effect was dependent on the stimulation frequency; 900 pulses at 10 Hz caused no lasting change, and at 50 Hz a synaptic potentiation was usually observed. Second, the depressed synapses continued to support long-term potentiation in response to a high-frequency tetanus. Third, the effects of conditioning stimulation could be prevented by application of NMDA receptor antagonists. Thus, our data suggest that synaptic depression can be triggered by prolonged NMDA receptor activation that is below the threshold for inducing synaptic potentiation. We propose that this mechanism is important for the modifications of hippocampal response properties that underlie some forms of learning and memory.
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PMID:Homosynaptic long-term depression in area CA1 of hippocampus and effects of N-methyl-D-aspartate receptor blockade. 135 90

Patients with depressive motor retardation, neuroleptic induced parkinsonism or Parkinson's disease were tested on movement tasks requiring control of simultaneous movements. This was in order to determine whether these three groups of patients, who all show slowing of movements, also share the distinctive impairment of simultaneous movement control that is observed in Parkinson's disease. Though all three patient groups showed equivalent slowing on the motor tasks that were studied, the patterns of impairment were different. Only the patients with parkinsonism, either neuroleptic induced or from Parkinson's disease, showed additional slowing of a rapid ballistic elbow flexion movement when it was performed simultaneously with a rapid squeeze of the ipsilateral hand. Only patients with parkinsonism showed a significant increase in dual task interference on a bimanual bead and tapper task, compared with controls. The bead and tapper interference in patients with depressive motor retardation was between that of controls and parkinsonism. Having a bimanual skill had a large effect on the subjects' dual task interference on this task. The measures of dual task interference for the two tasks did not correlate with one another; difficulty running simultaneous motor programs does therefore not explain the interference that is observed when tapping is performed while the other hand simultaneously performs a dextrous motor task. Only patients with parkinsonism showed increased fatigue on the tapping task. The patients with depressive motor retardation did have elevated scores on a clinical rating of parkinsonism. Nevertheless there are clearly defined differences between the movement disorder observed in patients with depression, and that observed in in parkinsonism. The patterns of impairments in patients with neuroleptic parkinsonism were very similar to those of Parkinson's disease.
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PMID:Control of simultaneous movements distinguishes depressive motor retardation from Parkinson's disease and neuroleptic parkinsonism. 135 98

The average therapeutic effect of classical tricyclic antidepressants and antidepressants of the second and third generation varies between 60-70%. Moreover, tricycklic antidepressants are associated with undesirable effects mostly anticholinergic and "cardiotoxic", which may be a contraindication in particular in patients with multiple diseases and in older age groups. The authors compared two new alternative therapeutic procedures, represented by new highly effective benzodiazepines and anticonvulsants, as regards the therapeutic effect and side-effects. From this comparison ensues that their general therapeutic effect is on average comparable with the effect of tricyclic antidepressants, however, in the spectrum of their undesirable symptoms the anticholinergic effects are absent. Recent benzodiazepines have a better effect on depressions where anxiety and agitation are in the foreground. Their effect on depressive core symptoms is more marked, as compared with anticonvulsants. The most frequent side-effects are fatigue, somnolence and vertigo. Anticonvulsants have a balanced effect in different syndromological forms of depression. Undesirable effects are mostly gastrointestinal. In the authors' trials it did not lead to hypomania.
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PMID:[Alternative therapy in the acute phase of endogenous depression--antiepileptics and new benzodiazepines and their comparison]. 136 40

This study describes sexual activity, nocturnal penile erections, and mood states as a function of serum levels of androgens in previously untreated hypogonadal men before and during hormone replacement, selected infertile men (elevated serum follicle-stimulating hormone levels), and normal men. Nocturnal penile tumescence and rigidity were measured with a portable monitor, and sexual activity and mood were assessed by prospective, self-reported written forms. Nocturnal erections were absent or of very low amplitude and duration in the untreated hypogonadal men compared to the infertile and normal men. Nocturnal erections increased steadily during hormone replacement and were in the normal range within 6 to 12 months of treatment. In contrast, serum testosterone concentration rapidly reached the upper range of normal. During treatment, the hypogonadal men reported increases in several aspects of sexual activity, including sexual interest and the number of spontaneous erections. On mood inventories, the untreated hypogonadal men scored significantly higher in ratings of depression, anger, fatigue, and confusion than did infertile and normal men. During hormonal replacement therapy these scores decreased, although the hypogonadal men continued to score higher in "depression" than did infertile and normal men. In most instances, the men with infertility and the normal men were statistically indistinguishable in nocturnal penile tumescence and rigidity parameters, self-reported sexual activity, and mood state. These data support the hypothesis that androgen treatment increases nocturnal and spontaneous erections, and sexual interest, and has some capacity to improve mood.
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PMID:A long-term, prospective study of the physiologic and behavioral effects of hormone replacement in untreated hypogonadal men. 139 30

A group of 24 Dutch World War II Resistance veterans with a documented traumatic war history and a (partially) positive diagnosis of current posttraumatic stress disorder (PTSD) was studied. This special group of war victims is characterised by chronicity, suffering from intractable posttraumatic complaints for decades. They were treated with fluvoxamine (Fevarin), a selective serotonin reuptake inhibitor with antidepressive and anxiolytic properties. The study was designed as an open-ended, outpatient pilot study, with a treatment period of 12 weeks. Results of clinical examination, and questionnaires investigating PTSD, depression, sleeping problems, anxiety, and vital exhaustion indicate that a significant number of the subjects improved with respect to their PTSD symptomatology, and their symptoms of anxiety and vital exhaustion. However, at the end of the study, quantitative improvement was modest. The results indicate that treatment with fluvoxamine may offer alleviation of chronic PTSD symptoms, in particular insomnia, nightmares, anxiety, intrusive recollections, guilt feelings and tiredness.
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PMID:Fluvoxamine treatment for chronic PTSD: a pilot study. 141 Jan 91


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