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)

We looked for brain perfusion abnormalities in patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). An initial pilot study revealed widespread reduction of regional brain perfusion in 24 ME/CFS patients, compared with 24 normal volunteers. Hypoperfusion of the brainstem (0.72 +/- 0.05 vs. 0.80 +/- 0.04, p < 0.0001) was marked and constant. We then tested whether perfusion to the brainstem in ME/CFS patients differs from that in normals, patients with major depression, and others with epilepsy. Data from a total of 146 subjects were included in the present study: 40 normal volunteers, 67 patients with ME/CFS (24 in the pilot study, 16 with no psychiatric disorders, 13 with ME/CFS and depression, 14 with ME/CFS and other psychiatric disorders), 10 epileptics, 20 young depressed patients and 9 elderly depressed individuals. Brain perfusion ratios were calculated using 99Tcm-hexamethylpropylene amine oxime (99Tcm-HMPAO) and single-photon emission tomography (SPET) with a dedicated three-detector gamma camera computer/system (GE Neurocam). Brain-stem hypoperfusion was confirmed in all ME/CFS patients. Furthermore, the 16 ME/CFS patients with no psychiatric disorders and the initial 24 patients in the pilot study showed significantly lower brainstem perfusion (0.71 +/- 0.03) than did depressed patients (0.77 +/- 0.03; ANOVA, p < 0.0001). Patients with ME/CFS have a generalized reduction of brain perfusion, with a particular pattern of hypoperfusion of the brainstem.
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PMID:Brainstem perfusion is impaired in chronic fatigue syndrome. 872 60

The EEG alterations attributed to senescence are the complex result of functional as well as organic factors, such as normal physiological aging, pathological process which results in cognitive deterioration, and/or psychological phenomena including depression. The aim of this study is to clarify which factors influence which EEG features and to evaluate the relationship between the clinical and electrophysiological indices. For simplicity, this study focused on the major three factors that are important in dealing with senescence; 1) normal, physiological aging; 2) dementia; 3) depression. A total of 191 subjects participated in this study. The subject groups were classified into 9 groups based on their age and pathology. Two healthy elderly groups (N = 60; between the ages of 60 and 80 years; subclassified according to their social activity), a healthy young volunteers' group (N = 30; between the ages of 20 and 39), a healthy middle-aged volunteers' group (N = 30; between the ages of 40 and 59), four subject groups of dementia of Alzheimer's type [DAT] classified according to the severity of dementia (total number of subjects = 44), depressive elderly subjects (N = 12), and one group of subjects who are older than 80 years (N = 15). The depressive subjects were diagnosed as major depression with their main symptom being psychomotor retardation which resembles the clinical picture of early dementia. The EEGs change with age. This well-approved fact is also confirmed in this study based on ANOVA. Within the same age groups, there were little differences in EEGs regardless of the quality of their social activities. More slow activity, more 20-32Hz fast activity, and less 13.5-20.0Hz beta activity were seen in the socially-inactive group than in the socially-active group (multiple range test based on Tukey's method). The fact that no tendency of increases in slow and fast activities accompanied by a decrease of alpha activity were seen in the socially-active group suggest that having such tendency in their EEG features may be indicative of underlying pathological process that are qualitatively different from normal physiological aging. The moderate grade of those change may not yet cause clinical impairment noticeable as dementia, but appear as less social activity. The EEGs of depressed elderly differed from the socially-inactive elderly as well as the mild dementia particularly in beta frequency bands. There were no significant differences between the socially-inactive elderly and the mild dementia. The tendency of an increase of slow activity and a decrease of alpha activity was seen as the clinical severity of dementia increases. However, these changes reached at the statistically significant level only in the extremely demented subject group. To extract the feature indices of the EEGs, PCA was applied. Five principal components were descriptive of 88% of the data. The EEG features summarized by these components could differentiate the socially-active elderly and the socially-inactive elderly, and the depressed group was distinctively differed from other groups. Interestingly PCA showed the similarity between the socially-inactive elderly and the mild dementia, and the similarity between the middle-aged and the young volunteers. Except for the extreme dementia, subgroups of DAT patients according to the clinical severity did not show distinctive differences in EEG features. The correlation among the EEG derivations was investigated using cluster analysis. The result indicated that the interhemispheric electrophysiological correlation diminishes along with the advancement of the pathological process of the brain. This study indicated that the EEG indices derived from the multivariate analyses are more informative in regard to the relationship among EEG variables as well as these spatial relationship than evaluating the changes in each frequency band alone.
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PMID:[Analytic study on EEG features of aging with/without psychiatric disorders: focussing at the alterations in the EEGs of the healthy, depressive and demented elderlies]. 855 25

The ventilatory response to isocapnic hypoxia is biphasic, which makes any experimental assessment of the relationship between the acute (peak) ventilatory response and the level of hypoxia difficult. This study explored whether one particular protocol could be useful for determining this relationship. The protocol consisted of exposing subjects to seven different levels of isocapnic hypoxia, each of which lasted 50 sec. In order to test whether the order of the hypoxic exposure had any effect on the outcome, the steps were performed both in increasing and decreasing severity of hypoxia, and the ventilatory responses compared. Twelve subjects were studied, and each test was repeated four times in each subject. PETCO2 was held at 2 mmHg above resting throughout. The ventilations obtained at the lowest level of PETO2 employed were clearly different between the two protocols. However, provided that these ventilations were excluded, no significant differences were present between the results from the ascending and descending exposures (ANOVA). This finding suggests that the rate of change of PO2 in these protocols was sufficiently slow for a full ventilatory response to develop, but also sufficiently fast to prevent significant ventilatory depression from occurring.
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PMID:A protocol for determining the shape of the ventilatory response to hypoxia in humans. 857 Sep 16

Clinical, neuropsychological and neuropsychophysiological data (Q-EEG, ERPs and CNV/RT activity) were obtained from 24 patients who had more or less severe presenile primary cognitive decline without depression, and compared with similar data from 10 age-matched healthy volunteers (mean age, 59.4 years). All of the patients (15 M and 9 F; mean age 59.6 years) were selected according to the DSM III-R, ICD-10 and NINCDS-ADRDA criteria and underwent CT and MRI scanning, in addition to a standard clinical examination, a battery of psychometric tests, spectral EEG, and bit-mapped CNV complex and RT to S2 analyses. Twelve of the 24 patients presented an initial presenile idiopathic cognitive decline (PICD) but did not wholly fulfil the clinical and neuropsychological criteria for primary dementia or for a diagnosis of probable AD; the remaining 12 patients showed characteristic clinical signs and symptoms of a very probable early stage of presenile Alzheimer-type dementia (PAD). ANOVA, correlational and discriminant analyses of the neuropsychological test scores, and the neurophysiological and RT to S2 data revealed 22 highest-ranked between-group discriminant factors (all with a significance level of p < 0.01). The conclusive discriminant analysis retained 13 of these factors as final canonical functions, and these showed a 97% grouping accuracy (33 of the 34 subjects examined); the same percentage of correct classifications was also achieved using only the 15 best indicators in the group of CNV/RT findings. Using both of these sets of highest-ranked discriminators, all of the normal subjects and all of the PAD patients were correctly classified; only 1 PICD patient was misclassified as normal when the first group of 13 factors was used, and another PICD patient was misclassified as PAD using the second group of 15 factors. Our findings suggest that, providing they are correctly performed and interpreted, these non-invasive techniques may be an important tool for identifying incipient stages of presenile Alzheimer-type dementia.
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PMID:Brain electrical activity (quantitative EEG and bit-mapping neurocognitive CNV components), psychometrics and clinical findings in presenile subjects with initial mild cognitive decline or probable Alzheimer-type dementia. 862 14

We have developed a human tissue preparation suitable for measurement of cilia beat frequency derived from nasal turbinates. Cilia beat frequency of turbinate explants from 11 patients did not change significantly over a 10-day observation period while maintained in an incubator, with mean cilia beat frequency of 13.1 (SEM 0.3) Hz to 14.4 (0.2) Hz (ANOVA for repeated measures, P = 0.168). We have used this preparation to investigate recovery of ciliary function after depression by inhalation anaesthetic agents. Eight or nine turbinate explants were exposed to three times the minimum alveolar concentration (MAC) of halothane, enflurane or isoflurane for a period of 1 h and thereafter to a period of air washout. After exposure to the inhalation agent there was a significant reduction in cilia beat frequency with all three agents: halothane 14.3 (0.4) Hz to 9.5 (0.3) Hz; enflurane 13.7 (0.6) Hz to 10.5 (0.5) Hz;isoflurane 15.9 (0.6) Hz to 10.6 (0.3) Hz. Cilia beat frequency returned to values after air washout that were not significantly different from baseline after 90 min of washout of halothane and 60 min of washout of enflurane and isoflurane (repeated measures ANOVA, unpaired t test; P = 0.01 at 60 min and P = 0.31 at 90 min washout for halothane; P = 0.83 at 60 min washout for enflurane; P = 0.26 at 60 min washout for isoflurane).
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PMID:Recovery of respiratory ciliary function after depression by inhalation anaesthetic agents: an in vitro study using nasal turbinate explants. 867 62

The purpose of this study was to examine fathers' psychological responses to labor/delivery over time and to evaluate the effect of child-birth class on the father. A quasi-experimental and exploratory study was conducted with data collected at the 36th and the 39th weeks of pregnancy, and the first day of the postpartum period. 100 married, first-time expectant fathers in both the experimental and control groups were drawn from one medical center in southern Taiwan as a convenient sample. Three two-hour sessions of childbirth class, each lasting for one day, were conducted consecutively following the first data point for the experimental group. The "Chinese Health Questionnaire" and Zung's Self-rating Anxiety and Self-rating Depression Scales were used to obtain the first-time fathers' health status, anxiety, and depression scores at each data point. The two-way ANOVA with repeated measures was used to compare the means of psychological responses between experimental and control groups at each point in time. The main effect of classes on paternal health status, anxiety, and depression of the experimental group was not found and the limitations of the study were discussed.
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PMID:The effect of child-birth class on first-time fathers' psychological responses. 868 47

A total of 43 patients with multiple sclerosis (MS) consecutively admitted to the Multiple Sclerosis Rehabilitation Hospital in Haslev completed a Danish version of the Laman & Lankhorst Questionnaire (LLQ) on quality of life (qol), and the Beck Depression Inventory (BDI). Twenty-one of the 43 pts completed the questionnaires at discharge as well. All patients received the standard multidisciplinary rehabilitative treatment. The purpose was to evaluate the LLQ as a measure of qol and as an outcome measure. The 43 MS-patients had low weighted qol scores on the following items: readily tired, fatigue, dependence on other people, worry about deterioration and walk. Correspondingly, the BDI showed high scores on fatigability, work difficulty and somatic preoccupation. The correlation between LLQ and BDI was statistically significant (0.54, p < 0002), but weak. ANOVA with repeated measures (LLQ and BDI at admission and discharge) was applied to evaluate rehabilitation outcome in 21 patients. LLQ: The patients experienced a significant reduction in disability on fatigue and mood; and in the importance of being able to climb stairs and to work. The weighted qol-scores increased significantly on physical endurance, work and mood. BDI scores showed a significant decrease on pessimism, irritability, loss of libido and total BDI-score. The changes measured by the LLQ were mainly on behavioral aspects. As the correlation coefficient was only 0.54, the LLQ and the BDI seem to address different aspects of quality of life.
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PMID:Quality of life as a measure of rehabilitation outcome in patients with multiple sclerosis. 873 30

Endotoxin depresses left ventricular (LV) contractility independently of alterations in loading conditions, acidosis, or hypoxia (Hung and Lew, 1993a). We evaluated if endotoxin-induced LV depression is associated with a decrease in functional L-type calcium channels, as reflected by the number of dihydropyridine receptors measured by [3H]-PN200-110 binding. New Zealand white rabbits were instrumented with sonomicrometers to measure the end-systolic pressure-volume relationship after i.v. saline (group 1, n = 6), 5 micrograms/kg endotoxin (group II, n = 6), or 10 micrograms/kg endotoxin (group III, n = 6). The end-systolic volume (ESV) measured at a matched end-systolic pressure did not change significantly over 6 h in group I (ESV changed by < 5 +/- 2% S.E.) and group II (ESV changed by < 3 +/- 2%), but increased markedly in group III (ESV increased 70 +/- 24%, P < 0.05), indicating LV systolic depression. We measured [3H]-PN200-110 binding in crude membrane homogenates from the left ventricle. There was a dose-dependent decrease in Bmax: 75 +/- 5 fmol/mg protein in group I, 62 +/- 3 fmol/mg in group II, and 56 +/- 5 fmol/mg in group III (P = 0.02 by ANOVA). Since the majority of dihydropyridine receptors are functional L-type calcium channels in rabbits (Lew et al., 1991), we conclude that a decreased number of dihydropyridine receptors contributes to endotoxin-induced LV depression.
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PMID:Endotoxin-induced cardiac depression is associated with decreased cardiac dihydropyridine receptors in rabbits. 878 78

In a recent placebo-controlled multicenter study, 38 patients, ranging in age between 62 and 88 years (median, 71) were treated with nortriptyline (NT) for up to 7 weeks. NT was administered in a divided dose of 75 mg daily and serum NT (se NT), and its 10-hydroxy-metabolites (se OH-NT) were determined at various intervals. Several clinical measures of efficacy, including the 17-item Hamilton Rating Scale for Depression, were evaluated weekly as well as side effects (anticholinergic) and electrocardiogram (ECG) changes. Eighty-one percent of patients had NT levels in the previously defined therapeutic range of 50 to 170 ng/ml, with steady state reached between 1 and 3 weeks. There was little individual variation in drug kinetics and metabolism over the study period. In general se OH-NT levels were not greater than those of se NT. Pharmacodynamic analyses showed that patients with moderate to severe anticholinergic side effects [CSE(+)] had significantly higher NT levels than those with mild or no symptoms [CSE(-)]. Furthermore, repeated-measures ANOVA modeled over time showed a highly significant decrease in clinical measures in both CSE groups of patients and also a highly significant group-time interaction. Higher se OH-NT levels were associated with less anticholinergic side effects. No ECG changes were observed.
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PMID:Clinical relevance of serum nortriptyline and 10-hydroxy-nortriptyline measurements in the depressed elderly: a multicenter pharmacokinetic and pharmacodynamic study. 879 86

The choroid plexus, which is responsible for the maintenance of the biochemical milieu of the cerebrospinal fluid (CSF), avidly sequesters Pb. In order to test the hypothesis that chronic Pb exposure may impair choroid plexus function, male weanling Sprague-Dawley rats were exposed to Pb in drinking water at doses of 0, 50, or 250 micrograms Pb/ml (as Pb acetate) for 30, 60, or 90 days. The function of the choroid plexus was assessed as reflected by CSF concentrations of transthyretin (TTR, a major CSF protein manufactured by brain choroid plexus) and CSF essential metal ions (Ca2+, Mg2+, K+, and Na+). TTR concentrations were determined by radioimmunoassay using a monospecific rabbit anti-rat TTR polyclonal antibody, and CSF metal ions analyzed by flame atomic absorption spectrophotometry. Two-way ANOVA of CSF TTR concentrations revealed highly significant dose (p < 0.0001), time (p < 0.0223), and dose-by-time effects (p < 0.0379). Moreover, the percentage of reduction of CSF TTR was directly correlated with Pb concentrations in the choroid plexus (r = 0.703, p < 0.05). Pb exposure significantly increased CSF concentrations of Mg2+, but did not markedly altered CSF concentrations of Ca2+, K+, and Na+. Histopathologic examination under the light microscope did not show distinct alterations of plexus structure in Pb-treated rats. Since TTR is responsible for transport of thyroid hormones to the developing brain, we postulate that the depression of choroid plexus TTR production (and/or secretion) by Pb may impair brain development in young animals by depriving the CNS of thyroid hormones.
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PMID:Chronic lead exposure alters transthyretin concentration in rat cerebrospinal fluid: the role of the choroid plexus. 916 86


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