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

The effect of timolol versus propranolol on hypertension, hemodynamics, and plasms renin activity was evaluated in 20 men. After two weeks of placebo, 11 men received timolol 30 to 60 mg daily, and nine men received propranolol, 240 to 480 mg daily, for five weeks in a double-blind randomized study. The 20 men then received placebo again for two weeks. Right heart catheterization was performed in all 20 patients after two weeks of the first placebo and after five weeks of timolol or propranolol. Equipotent doses of timolol and propranolol were equally effective in significantly lowering supine and upright systolic and diastolic blood pressure and heart rate recorded on an outpatient basis. Equipotent doses of timolol and propranolol caused similar hemodynamic effects including similar significant depression of cardiac index. Equipotent doses of timolol and propranolol caused similar marked depression of plasma renin activity. The hypotensive action of timolol and of propranolol was unrelated to their effect on plasma renin activity.
 ...
PMID:Effect of timolol versus propranolol on hypertension and hemodynamics. 0 61

In previous reports, methamphetamine was shown to depress tyrosine hydroxylase (TH) activity in the rat corpus striatum. To evaluate further the mechanism of this decrease in TH activity, enzyme activity was measured in the rat corpus striatum and substantia nigra after repetitive and single-dose methamphetamine administration. Following repeated doses of methamphetamine, nigral TH activity decreased and reached 45% of controls at 12 hr and returned to normal at 60 hr. Striatal TH activity decreased to 40% of control at 36 hr and returned toward normal at 60 hr. When methamphetamine was administered every 6 hr for 30 hr and then discontinued, nigral TH activity returned toward control levels 4 days prior to recovery of striatal TH activity. Methamphetamine initially increased striatal dopamine levels at 6 hr (170% of control). Dopamine levels then decreased in parallel with striatal TH activity but failed to increase as the enzyme recovered. Concurrent administration of chlorpromazine with methamphetamine prevented the methamphetamine-induced decrease in nigral and striatal TH activity and striatal dopamine levels. The results indicate that the methamphetamine-induced depression of striatal and nigral TH activity may be related to increased stimulation of dopamine receptors in the striatum.
 ...
PMID:Influence of methamphetamine on nigral and striatal tyrosine hydroxylase activity and on striatal dopamine levels. 0 86

Lymph node graft-versus-host reaction (GVHR) induced by parental splenic lymphocytes inoculated into hind foot pads of F-1 hybrid rats is correlated with the state of the thymus and the spleen of the recipients. This may explain the depression of the reaction after protracted protein deprivation. Furthermore, GVHR provokes mainly in normal rats a reduction of thymus and spleen possibly due to a T-cell transfer to the grafted area.
 ...
PMID:Graft-versus-host reaction and lymphoid organs in normally fed and protein-deprived rats. 0 99

The response of rainbow trout Na+ and Cl- uptake systems to acute acidosis was tested by slow infusion of lactic acid into anaesthetized animals. Depression of blood pH by 0-4 pH unit had no effect on influx rates for either ion, and we conclude that gill ion uptake systems do not respond rapidly to blood pH changes.
 ...
PMID:Responses of trout gill ion transport systems to acute acidosis. 0 9

The effects of the crude venom, four partially purified venom fractions and pure toxin (Pelamis toxin alpha) from yellow-bellied sea snake, Pelamis platurus, on respiration, blood pressure, heart and skeletal muscle of rabbits have been examined. Results indicated that crude venom, a partially purified toxic fraction and Pelamis toxin alpha caused initial respiratory stimulant effects followed by respiratory paralysis. In most cases, respiratory paralysis occurred before a profound fall in arterial pressure. Depression of the twitch response to nerve stimulation was observed in the tibialis anterior muscle. No significant change in the electrocardiogram was seen. Three partially purified non-toxic fractions of the crude venom induced transient respiratory stimulant effects. It was concluded that the crude venom and Pelamis toxin alpha had an identical mode of action and that they caused respiratory paralysis in rabbits.
 ...
PMID:Some pharmacological properties of the venom, venom fractions and pure toxin of the yellow-bellied sea snake Pelamis platurus. 0 73

Metoclopramide has a dual effect on intestinal smooth muscle. Low concentrations of metoclopramide cause potentiation of the responses to substance P, acetylcholine, histamine and barium chloride on the guinea-pig ileum. Higher concentrations produce a depression of smooth muscle responses which is characteristic of the tertiary amine local anesthetics. Neural pathways are involved in the mechanism of potentiation, since the enhancement of the responses to the agonists is abolished by tetrodotoxin. Atropine partially antagonizes the potentiating effect of metoclopramide implying that activation of muscarinic receptors is a contributing factor, but this does not fully explain the potentiation.
 ...
PMID:The effects of metoclopramide in modifying the response of isolated guinea-pig ileum to various agonists. 0 87

A prospective, randomized study was performed to compare syrup of ipecac to apomorphine as the emetic of choice in poisoning cases. Of the 28 adults studied, 15 patients (54%) received 30 ml of ipecac orally and 13 received 0.1 mg/kg apomorphine subcutaneously. Emesis was successfully induced with initial therapy in 13 of 15 (87%) ipecac-treated patients and 10 of 13 (77%) apomorphine-treated patients. In the ipecac group the mean latency period before onset of vomiting was 11.6 minutes (range 4 to 26 min) and in the apomorphine group, 5.3 minutes (range 2 to 13 min) (P less than .01). In the ipecac group, one patient suffered moderate central nervous system (CNS) depression. No hypotension or respiratory depression was observed in this group. In the apomorphine group significant CNS depression developed in eight patients (62%), hypotension developed in five (38%) and respiratory depression in one. There was no consistent relationship between type of poison ingested and occurrence of side effects.
 ...
PMID:A clinical comparison of syrup of ipecac and apomorphine use in adults. 0 15

Dibenzepin and amitriptyline appeared to be equally efficacious in controlling target symptoms of depressive reactions. These results appear to be consistent with pharmacological profiles of the two drugs which are both tricylic compounds. Control of target symptoms occurred in an undulating and non-progressive manner in both groups. Aggravation of depressive symptomatology in the third week of treatment was noted in both groups and appeared to be clinically very important in the management of depressed patients. Dibenzepin caused relatively fewer side effects which appears to be an advantage over amitriptyline. Dibenzepin appeared to be a suitable alternative for amitriptyline intolerant patients, with moderately severe depression associated with anxiety, especially patients who demonstrated emotional sensitivity or passive dependent personality, and psychosomatic symptoms.
 ...
PMID:Dibenzepin and amitriptyline in depressive states: comparative double-blind trial. 0 28

Eighteen patients with angina pectoris, who had previously participated in a cross-over study with 20 mg metoprolol t.i.d. and placebo, have been included in this study. During an introductory six-month open tolerability study, all patients were treated with 50 mg metoprolol t.i.d. and during a subsequent cross-over study, the efficacy of this dose was compared with that of placebo under double-blind conditions. An exercise was performed at the end of each cross-over period. Metoprolol, in a dose of 50 mg t.i.d., gave a significant improvement compared with placebo in respect of the number of anginal attacks, nitroglycerin consumption and daily subjective assessment of the patients' anginal symptoms. Metoprolol also gave a significant increase in exercise capacity, both until the appearance of 1 mm ST segment depression and until the end of exercise. Heart rate and blood pressure were reduced both at rest and during exercise. No severe unwanted effects were observed during this study ranging over eight months, and none of the patients had any signs or symptoms of cardiac failure or pulmonary dysfunction on any occasion. Unwanted effects reported were mild to moderate, and the frequency was the same as during placebo treatment. No abnormal laboratory findings were observed and the relative heart volume was not significantly changed. Administration of 50 mg metoprolol t.i.d. seems to be of greater benefit than 20 mg metoprolol t.i.d., previously investigated in these patients.
 ...
PMID:Effects of metoprolol in angina pectoris. A subacute study with exercise tests and a long-term tolerability study. 0

Data are presented which indicate that the mechanism of tension depression and subsequent recovery from dichlorodifluoromethane (Freon 12), an aerosol gas recently described as a potent cardiac depressant agent, differs from that of hypoxia. To analyze these differences, 22 rat papillary muscles, contracting isometrically in a myograph, were studied during and subsequent to 15-min interventions of of hypoxia. Freon 12 with adequate oxygenation, or Freon 12 combined with hypoxia. During each of the three interventions the developed force (F) was markedly depressed, while peak shortening velocity (Vpm) was selectively more depressed by Freon and Freon combined with hypoxia than by hypoxia alone. While hypoxia shortened the time to peak force (TTP) and one-half relaxation time (RT1/2) markedly, Freon 12 with adequate oxygenation slightly shortened RT1/2 (P is less than 0.001) but failed to shorten TTP significantly. In contrast, Freon 12 administered during hypoxia shortened TTP and RT1/2 significantly (P is less than 0.001), more than did hypoxia or Freon 12 alone. Posthypoxic prolongation of TTP and RT1/2 was not seen during recovery from Freon 12. This prolongation was depressed during recovery from Freon 12 given either during hypoxia or during recovery from hypoxia. The results indicate that Freon 12 and hypoxia act synergically, although the mechanisms through which they mediate their actions on myocardial tissue are not identical.
 ...
PMID:Effects of hypoxia and Freon 12 on mechanics of cardiac contraction. 0 44


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>