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)

Results are presented of an evaluation of the contraceptive efficacy, cycle control, and tolerance of a low dose triphasic pill, Trigynon, used by 353 reproductive-aged women for a total of 1668 cycles. 20 physicians in different Belgian centers recruited and followed the women. Average weight of the patients was 56.8 kg, average age was 24.8 years, average parity was 1.07, and 1/3 smoked. None had any medical condition contraindicating the use of the preparation. 156 of the women had never used contraception, 163 had used combined pills, 4 had used injectables, 6 had used progestin-only minipills, 21 had used IUDs, and 22 had used other methods. 2.5% of the patients forgot to take at least 1 pill in a typical cycle. No pregnancies were imputed to forgetting, but 3 pregnancies occurred during the study: 1 already established but not recognized at the start of treatment, 1 in a woman taking antituberculosis drugs, and 1 in a patient suffering an attack of dysentery. Almost 90% of patients had regular cycles of 28 days with treatment, compared to only 57.5% before treatment. The duration and quantity of bleeding were significantly decreased. Compared to the last pretreatment cycle, the 3rd and 6th cycles with Trigynon showed a decrease in percentage of patients complaining of dysmenorrhea, nervousness, headaches, breast tenderness, nausea, vomiting, decreased libido, depression, thrombophlebitis, and edema. The percentage complaining of acne and vertigo increased slightly at 3 months and then declined to below pretreatment levels. Average weight was almost unchanged. It appears that Trigynon offers reliable protection, excellent cycle control and few side effects, and would be an appropriate contraceptive choice for most women except those with benign breast disease or hyperestrogenism.
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PMID:[Clinical evaluation of 1,668 cycles of triphasic oral contraception (Trigynon). Multicentric Belgian study]. 681 54

As people grow older, side effects due to the modification of pharmacokinetics are the main disadvantage in the use of psychotropic drugs in geriatrics. First, some general rules of prescription must be respected. One will indirectly influence sleep by modifying habits and, if medication becomes necessary, will give preference to chloral hydrate, then to the benzodiazepine byproducts, and, last, to some sedative neuroleptics. Anxiety should be treated mainly with benzodiazepines, taking great care as to the doses. Regarding depression, all the tricyclics and tetracyclics can be used, not forgetting the atropinic effects they have. In case of glaucoma, some substances are free from side effects. In spite of age, resort to lithium is possible with all cautions needed. Neuroleptics will get their best use in confused or delirious states: their main side effects are of extrapyramidal nature.
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PMID:[Psychotropic drugs in geriatrics]. 728 Oct 48

Long-term depression (LTD) of synaptic transmission, often used as an essential component in synaptic models for learning, memory and forgetting, can be produced in layer II/III of the visual cortex by a prolonged, low-frequency stimulation (LFS) of layer IV. The activation of Ca2+/calmodulin-dependent protein phosphatase, calcineurin, has been postulated to play a role in the induction of LTD. The recent introduction of a specific inhibitor for calcineurin, FK506, prompted the investigation of the involvement of this phosphatase in the induction of LTD in visual cortex. Thus, we administered FK506 at 1 microM to visual cortical slices of young rats, and found that it did not significantly affect field responses of layer II/III evoked by test stimulation of layer IV at 0.1 Hz, but prevented LTD of the responses from being induced by LFS (1 Hz for 15 min) in all the 10 slices tested. Without FK506, significant LTD was induced by the same parameters of LFS in 8 of the 12 slices. These results suggest the critical involvement of calcineurin in producing LTD in visual cortex.
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PMID:An inhibitor for calcineurin, FK506, blocks induction of long-term depression in rat visual cortex. 753 57

It has been demonstrated that long-term posttetanic heterosynaptic depression (LTHD), manifested in the form of a prolonged decrease in the probability of monosynaptic responses of the cell to stimulation of that afferent pathway which was not activated during conditioning tetanization of another input, takes place in the neocortex, as it does in the hippocampus. LTHD is characterized by such properties as its long-term character, cooperativity, and nonspecificity of input. LTHD in the nonconditioned input and long-term posttetanic potentiation or long-term posttetanic homosynaptic depression in the conditioned input may develop both in parallel or independantly of one another. It is hypothesized on the basis of the results obtained that LTHD (as is the case with LTP and LTD) is a calcium-dependant phenomenon, and that the achievement of a specific level of depolarization of the membrane in the region of the disposition of the inactive synapses is required for its occurrence. "Contrasting," i.e., a relative increase in the efficiency of transmission in the activating synapse, may be effected through LTHD; LTHD may be one of the mechanisms underlying forgetting.
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PMID:Neurobiology of the integrative activity of the brain: some properties of long-term posttetanic heterosynaptic depression in the motor cortex of the cat. 771 72

Long-term potentiation (LTP) and long-term depression (LTD), often used as essential components in synaptic models for learning, memory and forgetting, can be produced in cortical tissue by repetitive activation of neural pathways under different stimulus conditions. The involvement of metabotropic glutamate receptors (mGluRs) has been postulated to be necessary for the establishment of either or both forms of synaptic plasticity in hippocampus. The recent introduction of a specific antagonist for mGluRs, (+/-)-alpha-methyl-4-carboxyphenylglycine, prompted the investigation of the respective involvement of this receptor population in the induction of LTP and LTD in visual cortex of the rat in vitro. The results suggest the critical involvement of mGluRs in producing LTD but not LTP.
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PMID:Induction of LTD but not LTP through metabotropic glutamate receptors in visual cortex. 782 42

The consequences of drug noncompliance may be serious in older patients. Estimates of the extent of noncompliance in the elderly vary, ranging from 40% to a high of 75%. Three common forms of drug treatment noncompliance are found in the elderly: overuse and abuse, forgetting, and alteration of schedules and doses. Some older patients who are acutely ill may take more than the prescribed dose of a medication in the mistaken belief that more of the drug will speed their recovery. Such overuse has clearly been associated with adverse drug effects. Forgetting to take a medication is a common problem in older people and is especially likely when an older patient takes several drugs simultaneously. Data suggest that the use of three or more drugs a day places elderly people at particular risk of poor compliance. The use of at least three drugs, and often more, is common in the elderly, with estimates of as many as 25% of older people taking at least three drugs. Averages of drug use among elderly hospitalized patients suggest that eight drugs taken simultaneously may be typical. Problems may also arise when dementia or depression is present, which may interfere with memory. The most common noncompliant behavior of the elderly appears to be underuse of the prescribed drug. Inappropriate drug discontinuation, furthermore, may occur in up to 40% of prescribing situations, particularly within the first year of a chronic care regimen. As many as 10% of elderly people may take drugs prescribed for others; more than 20% may take drugs not currently prescribed by a physician.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Medication compliance in the elderly. 783 47

1. Long-term depression (LTD) is an activity-dependent reduction in the strength of synaptic transmission that can persist for hours. It is a neural model for processes underlying learning and memory, such as extinction and forgetting. LTD of excitatory postsynaptic potentials (EPSPs) in cells of the CA1 region of hippocampal slices can be induced in an anti-Hebbian paradigm, i.e., by conditioning stimuli that activate the postsynaptic neuron in the absence of evoked synaptic transmission in the test pathway. Past work showed that LTD was not produced consistently in a pharmacologically untreated slice, but it could be induced more reliably when the conditioning stimuli were applied during block of evoked transmitter release. We have now defined further the conditions in which LTD can be obtained using postsynaptic conditioning by investigating 1) whether intracellular conditioning is effective, 2) the requirement for extracellular Ca2+, and 3) the consequences of selective block of glutamate ionotropic receptor subtypes during the conditioning procedure. 2. Intracellular recordings were made from CA1 pyramidal neurons. Test shocks were applied to the stratum radiatum except during conditioning, and the depolarizing slopes and amplitudes of evoked EPSPs were measured. The conditioning procedure activated the postsynaptic neuron either antidromically (via trains of shocks at 100 Hz applied to the axons in the alveus) or intracellularly (via depolarizing pulses of 1.5-3.5 nA). During conditioning, postsynaptic potentials (PSPs) evoked by the conditioning stimuli either were transiently blocked by bathing slices for 5 min in artificial cerebrospinal fluid (CSF) containing a high [Mg2+] or were reduced by glutamate antagonists. 3. When slices were bathed in CSF containing 25 mM Mg2+ and 2 mM Ca2+, evoked PSPs were transiently abolished; conditioning, either by antidromic or intracellular stimulation, always evoked a significant LTD. During the LTD produced by antidromic stimulation, the mean EPSP slope was 52.6 +/- 11.4% (mean +/- SE) of its control at 30-35 min after conditioning (n = 7). The LTD produced by intracellular conditioning was of similar magnitude: the mean EPSP slope was 57.2 +/- 11.6% of its control at 30-35 min postconditioning (n = 7). When slices were bathed in CSF containing 25 mM Mg2+ and 2 mM Ca2+ without conditioning stimuli, there was no LTD (mean EPSP slope 109 +/- 8.1% of its control at 30-35 min after reperfusion with CSF; n = 5).(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:The postsynaptic induction of nonassociative long-term depression of excitatory synaptic transmission in rat hippocampal slices. 809 30

It is shown that in the neocortex (like in the hippocampus) the long-term heterosynaptic depression (LTD) may exist. The effect appears as a long-term decrease of the probability of the monosynaptic responses in the afferent input to the recorded neuron after the conditioning tetanization of the other afferent input to the same neuron. The main properties of the heterosynaptic LTD are its longevity, cooperativity and lack of input specificity. The heterosynaptic LTD in the unconditioned input and the LTP or the homosynaptic LTD in the conditioned input can develop in parallel or independently of each other. It is supposed that the heterosynaptic LTD (like the LTP and the homosynaptic LTD) is Ca-dependent phenomenon and for its induction a certain level of depolarization of the membrane under the inactive (during conditioning) synapses must be achieved. The heterosynaptic LTD may provide for the "contrasting", i.e. the relative increase of the efficiency of the activated synapses, and probably be effective in such a phenomenon as forgetting.
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PMID:[The properties of long-term posttetanic heterosynaptic depression in the cat motor cortex]. 813 60

Long-term depression (LTD) of synaptic transmission is a candidate for a neuronal model of forgetting and is considered to be important in learning and memory. The present study employed extracellular recording in the CA1 pyramidal cell layer of rat hippocampal slices following orthodromic stimulation of Schaffer collateral fibres in stratum radiatum. Muscimol induced a time and concentration-dependent LTD at a frequency of stimulation of 0.01 Hz or in the absence of stimulation. The LTD was reversed by stimulation at 1 Hz. The ability of muscimol to act via GABAA receptors was confirmed by the ability of bicuculline (5 microM) to reverse the LTD. The NMDA non-selective glutamate antagonists kynurenate, failed to modify the LTD. receptor antagonist 2-AP5, the selective metabotropic antagonist L(+)AP3 and the non-selective glutamate antagonists kynurenate, failed to modify the LTD. (1S,3R)-ACPD, a selective agonist at metabotropic receptors, did not induce LTD. The lack of involvement of glutamate receptors in muscimol induced LTD in our protocol may indicate a novel type of long-lasting synaptic depression
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PMID:Glutamate-independent long term depression in rat hippocampus by activation GABAA receptors. 862 54

In order to determine the correlation of levels of symptoms of depression and rate of forgetting and perception of the future, a total of 68 elderly inpatients without Major Depression admitted to a general hospital were evaluated by: 1) the Montgomery-Asberg Depression Rating Scale (MADRS), 2) the Mini-Mental State Examination (MMSE), 3) a questionnaire on future self-perceptions (FSPQ), and 4) a test on the recall of verbal information to estimate the rate of forgetting. They were grouped according to the clinical prognosis of their disease (good, N = 48, 25 women, 23 men, age mean +/- SD, 68 +/- 6.64; poor, N = 20, 10 women, 10 men, age mean +/- SD, 69 +/- 6.68) which correlates with morbidity-mortality rates (low/high). There was no relationship between mild levels of signs and symptoms of depression and increased forgetting. However, levels of depression were negatively correlated to the score of future perceptions (B = -0.18, beta = -0.29, P = 0.032). Patients with diseases with good prognosis did not present different levels of depression, rates of forgetting or future expectations from those of patients with poor prognosis (high mortality rates). However, individuals with negative FSPQ scores showed significantly higher MADRS scores, independent of the type of disease. These data suggest that the modifications in the processing of information related to the future are present in clinical patients without Major Depression but they occur within a small range of very mild signs and symptoms of depression.
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PMID:Mild depression levels alter self-perceptions of future but not the recall of verbal information in elderly inpatients. 873 58


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