Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0012833 (dizziness)
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The specific competitive alpha 1-postsynaptic blocking action and haemodynamic effects of prazosin (Minipress) have been summarized. Prazosin causes dilatation of arterioles and veins, reduces total peripheral resistance as well as preload and afterload. Cardiac output does not change at rest, stroke volume and subsequent cardiac output increase during exercise. The changes in heart rate have non-significant. It does not cause sympathetic counter-regulation, plasma renin activity does not increase, aldosterone level decreases, salt- and fluid retention may rarely be observed. It does not provoke angina. The authors report on the results of their examinations with the first dose of prazosin in 61 patients (in 33 cases by the double-blind cross-over method by placebo control), and summarize the observations made with the drug in long-term treatment in Hungary. The authors and other teams used prazosin as a long-term treatment (of approximately 3 months) in combination with other drugs in a total of 344 patients, and as monotherapy in 159 patients. In the course of combination treatment side-effects were observed in 15% of the patients (dizziness, headache, weakness, occasionally palpitation). During monotherapy, side-effects occurred in 12% of the patients (tachycardia, headache, weakness, dizziness). Hungarian results confirm the usefulness of prazosin in all stages of hypertension. It is effective in 30-35% of the cases as a monotherapy (this rate is congruent with the efficacy of beta-blockers, calcium antagonists and antihypertensive drugs of central action). Earlier prazosin had been used as a third agent in combination treatment of hypertension.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:The mechanism of the action of Minipress. Examinations in hypertension. 257 64

A clinical-epidemiological study of an accidental poisoning by Robinia pseudoacacia L. (lucust tree) in six school children has been made. The case had sucked and/or chewed the bark of this plant. The clinical symptoms were abdominal pain, thirst, nausea, vomiting, dry throat, muscle weakness, mydriasis, headache, dizziness and diarrhea. The treatment was activated charcoal in 5 cases and subsequent gastric lavage in 3 cases. The results was favorable. The poisoning took place in the school yard during the mid-morning recreation period. Only girls were affected (average age 6.5 +/- 2.1 years old). The attack rate was 31.6% for the school children who tasted the bark, and chewing it constituted the highest factor of risk (p = 0.03). Recommendations have been made to prevent childhood accidents.
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PMID:[Clinico-epidemiologic study of accidental poisoning with Robinia pseudoacacia L. in school children]. 265 7

This is a report of the clinical analysis of 250 cases of dengue fever-like patients during the 1987-1988 epidemic in Southern Taiwan at Harn's clinic, Kaohsiung city. The results were: The peak age groups were between 20-40 years old. The ratio of male to female was 1:14. 98% patients presented with fever of mainly 3 to 6 days duration. 98% reported body pain, which included headache (82%), generalized soreness (65%), low back pain (50%). 95% patients had GI symptoms, such as anorexia (73%), nausea (60%), vomiting (45%). 97% patients complained of dizziness and weakness, and 22.4% patients had a bleeding tendency. The common bleeding sites were involving the subcutaneous (skin), gum, uterus, nasal cavity, GI tract, retina, and GU tract. The eruption rate was 78%. A majority of rashes appeared on the extremities, and then spread to the trunk. Less common symptoms were insomnia, chest tightness, urgency of urination, cough, running nose, palpitation, and shock. 45% patients were noted with hair loss. The hair loss was the latest presenting symptom, which tended to occur about two months after the recovery stage, and lasted for about one month. On physical examination, 62.6% patients had conjunctivitis, while only 1.3% had lymph node enlargement. Usually, the whole clinical course lasted for 7 to 14 days. Laboratory examination showed that leukopenia was noted from the second day and reached the lowest count on the fifth day, and recovered on 9th or 10th day. In 247 blood sera tested serologically for dengue fever, 84 were confirmed, while 157 were not confirmed yet due to patients' reluctance to accept a second blood drawing.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Clinical study on dengue fever during 1987-1988 epidemic at Kaohsiung City, southern Taiwan]. 273 68

Dizziness, headaches, and weakness occurred among three men after short-term hydrocarbon exposure during improper welding procedures in a closed container. Symptoms were related to objective evidence of vestibular and cognitive dysfunction. Symptoms and abnormal test results persisted for 6 to 18 months. Simulation of the accident failed to demonstrate likely exposures except aliphatic hydrocarbons, well within the permissible exposure levels. Short-term exposures to neurotoxins may lead to long-term central nervous system abnormalities.
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PMID:Encephalopathy and vestibulopathy following short-term hydrocarbon exposure. 273 52

Postural hypotension (PH) was investigated in 100 ambulatory patients aged 65 years or older, who were seen in a university family practice clinic. Thirty-one percent had a decrease in systolic blood pressure of 20 mmHg or more, while 16 percent had a diastolic drop of 10 mmHg or more. Twelve percent had a significant drop in both systolic and diastolic blood pressure upon standing. Patients with both systolic and diastolic PH were more likely to have had a fall during the year prior to evaluation and decreased functional ability compared with those without PH. The group with systolic PH was more likely to have symptoms on standing and a history of weakness, but dizziness and lightheadedness were not correlated with PH. Postural hypotension occurred in only 13 percent of patients without risk factors for PH and in 35 percent of patients with risk factors. However, this difference was not statistically significant. Demographics and functional ability were similar between the risk factor groups. Thus, PH occurred frequently in our patients, could not be reliably predicted on the basis of risk factors or symptoms, and was correlated with a history of a recent fall and decreased functional ability.
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PMID:Postural hypotension in elderly family practice patients. 280 Nov 91

A tilt-table test was performed on 12 untrained subjects to evaluate the humoral adaptation to postural change. The observed peripheral reaction with a reversible short-term rise of norepinephrine (NE) and plasma renin activity (PRA) allowed us to divide the syndrome of the orthostatic dysregulation into a hyponoradrenergic and hypernoradrenergic type. This classification can be helpful for the clinical evaluation and therapy of orthostatic lability. The central excessive stimulation of the antidiuretic (ADH) and adrenocorticotropic hormone (ACTH) follow-ing orthostatic symptoms such as weakness or dizziness was not completely reversible within the observation period of 30 min. The ADH and ACTH increase was not different between the hypo- and the hypernoradrenergic type of dysregulation but was the most sensitive indicator of orthostatic lability: 41% of all subjects showed a hypernoradrenergic orthostatic dysregulation with pronounced NE response and alpha 2-adrenoceptor down-regulation. By use of antiembolism stockings (AES) or dihydroergotamine (DHE) this rate decreased to 16%. This was associated with a significantly reduced NE and PRA response and a diminished alpha 2-adrenoceptor number.
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PMID:Humoral regulation of the orthostatic reaction. 284 55

The antihypertensive effect of the preparation celiprolol was studied in a double blind experiment versus acebutolol in 60 patients (30 males and 30 females), with an average age 40 years. Only patients with hypertonic diseases, stage I-II, according to WHO classification were included in the study. The treatment Lasted 4 weeks. The criteria for a good effect were the normalization of the blood pressure and the absence of adverse effects. There was no statistically significant difference between the percentages of the reduced blood pressure, attained by both preparations. By the end of 4th week, 56.7 per cent of the treated with celiprolol were with normalized blood pressure, and 46,7 per cent--with acebutolol. The following adverse effects were observed: light gastrointestinal manifestations, weakness, dizziness, tremor, impotence. In some of the patients those effects were transitory but in 4 patients, treated with acebutolol, the treatment was discontinued because of the adverse effects.
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PMID:[Clinical studies of celiprolol in the treatment of arterial hypertension]. 286 73

In 984 patients with generalized anxiety disorder who received buspirone in double-blind studies, the incidence of drowsiness (9 percent) did not differ significantly from that (10 percent) reported in 334 patients who received placebo. A probability value of p less than or equal to 0.10 was the criterion for significance. The incidence of drowsiness in buspirone-treated patients was significantly less than that in each of the groups receiving diazepam (32 percent), clorazepate (26 percent), lorazepam (58 percent), or alprazolam (43 percent). The side effects that did occur significantly more frequently in the buspirone group than in the placebo group were dizziness (9 percent versus 2 percent), headache (7 percent versus 2 percent), nervousness (4 percent versus 1 percent), light-headedness (4 percent versus less than 1 percent), diarrhea (3 percent versus less than 1 percent), paresthesia (2 percent versus less than 1 percent), excitation (2 percent versus less than 1 percent), and sweating/clamminess (1 percent versus 0 percent). The severities of these effects were predominantly rated as only mild or moderate. Fatigue occurred less frequently in buspirone-treated patients than in those receiving any of the benzodiazepines, and weakness occurred more frequently in diazepam-treated patients. Depression occurred less frequently in buspirone-treated patients than in those receiving clorazepate, diazepam, or lorazepam. Impotence occurred only in clorazepate- and lorazepam-treated patients. Decreased libido occurred more frequently in diazepam-treated patients, whereas increased libido was more frequent in clorazepate-treated patients. Nausea was reported more frequently in buspirone-treated patients than in those receiving clorazepate, diazepam, or alprazolam; diarrhea occurred more frequently in the buspirone group than in the diazepam group. The mean daily doses of the various treatments were buspirone, 20 mg; diazepam, 20 mg; clorazepate, 24 mg; lorazepam, 3 mg; and alprazolam, 1.5 mg. In an open-field study in West Germany involving 5,414 patients, gastrointestinal-related complaints were the most frequently reported side effects.
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PMID:Review of the side-effect profile of buspirone. 287 Jun 41

Renal insufficiency was not shown to affect the pharmacokinetics of terazosin in fifteen patients receiving oral terazosin (1 mg once daily) for two weeks. Five patients had normal renal function (creatinine clearance 80 ml per minute or more), five had moderate renal insufficiency (creatinine clearance 30 to 79 ml per minute), and five had severe renal insufficiency (creatinine clearance 10 to 29 ml per minute). Urine and blood samples were collected, and blood pressure and pulse rate were determined on days one and 15 of the study. Renal insufficiency had no significant effect on the absorption lag time, rate of absorption, rate of elimination in the urine, volume of distribution, or plasma clearance of terazosin. The plasma half-life of terazosin in patients with normal renal function was 10.0 hours, compared with 8.4 hours in patients with moderate renal insufficiency and 9.8 hours in the group with severe renal insufficiency. There was also no apparent relationship between renal insufficiency and the maximum change in blood pressure or pulse rate. Renal excretion was found to play a minor role in the elimination of terazosin, and this explains the lack of a relationship between renal insufficiency and the pharmacodynamics of terazosin. After the administration of terazosin on day 1 of the study, 1.6 +/- 0.3 percent and 5.1 +/- 1.4 percent of the total dose was excreted in the urine of patients with severe renal insufficiency and normal renal function, respectively. Adverse experiences were reported by four patients and caused one patient to withdraw from the study. Symptoms reported included gastralgia, headache, dizziness, malaise, weakness, and palpitations. The results of this study indicate that terazosin may be safely administered to patients with renal insufficiency without altering the usual dosing regimen.
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PMID:Influence of renal insufficiency on the pharmacokinetics and pharmacodynamics of terazosin. 287 15

The so-called Oriental flushing reaction associated with ingestion of small amounts of alcohol was antagonized by combined antihistamine administration. In stage one of the study, the flushing reaction to low doses of alcohol was produced in Orientals. Most subjects experienced a cutaneous flush, increase in skin temperature, decrease in blood pressure, increase in pulse rate and subjective symptoms such as dizziness, sleepiness, anxiety, headache, generalized weakness and nausea. One half of the group of subjects was then given diphenhydramine, 50 mg (H1 receptor antagonist) and cimetidine, 300 mg (H2 receptor antagonist) and the second half received placebo tablets before the administration of alcohol. The clearest difference between the antihistamine group and placebo group was in the skin flushing reaction. The antihistamine group showed a statistically significant reduction in the skin flush. The antihistamines also neutralized the systolic hypotension induced by the administration of alcohol.
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PMID:Combined antihistamine antagonism of the flushing reaction to alcohol. 289 99


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