| 1. |
- Ahlborg, Gunnar, 1948, et al.
(författare)
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Reproductive effects of chemical exposures in health professions
- 1995
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Ingår i: Journal of Occupational and Environmental Medicine. - 1076-2752. ; 37:8, s. 957-61
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Forskningsöversikt (refereegranskat)abstract
- Numerous chemical substances are handled by persons working in the health care sector. At exposure levels that may occur in the occupational setting, some of these substances are potentially harmful to the reproductive processes. Among the potentially harmful substances are anesthetic gases, antineoplastic agents, and sterilants. The epidemiological evidence of increased risks for adverse reproductive effects (eg, subfertility, spontaneous abortions, congenital defects) from such exposure is not unequivocal. However, due to the toxic potential, exposures should be kept at a minimum, and this may be especially important for workers who are pregnant or are planning to achieve pregnancy.
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| 2. |
- Carlsson, Maria L., 1959, et al.
(författare)
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The 5-HT2A receptor antagonist M100907 is more effective in counteracting NMDA antagonist- than dopamine agonist-induced hyperactivity in mice
- 1999
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Ingår i: J Neural Transm. - 0300-9564. ; 106:2, s. 123-9
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the present study was to compare the effectiveness of the selective 5-HT2A antagonist M100907 in different psychosis models. The classical neuroleptic haloperidol was used as reference compound. Two hyperdopaminergia and two hypoglutamatergia mouse models were used. Hyperdopaminergia was produced by the DA releaser d-amphetamine or the DA uptake inhibitor GBR 12909. Hypoglutamatergia was produced by the un-competitive NMDA receptor antagonist MK-801 or the competitive NMDA receptor antagonist D-CPPene. M100907 was found to counteract the locomotor stimulant effects of the NMDA receptor antagonists MK-801 and D-CPPene, but spontaneous locomotion, d-amphetamine- and GBR-12909-induced hyperactivity were not significantly affected. Haloperidol, on the other hand, antagonized both NMDA antagonist- and DA agonist-induced hyperactivity, as well as spontaneous locomotion in the highest dose used. Based on the present and previous results we draw the conclusion that 5-HT2A receptor antagonists are particularly effective against behavioural anomalies resulting from hypoglutamatergia of various origins. The clinical implications of our results and conclusions would be that a 5-HT2A receptor antagonist, due to i a the low side effect liability, could be the preferable treatment strategy in various disorders associated with hypoglutamatergia; such conditions might include schizophrenia, childhood autism and dementia disorders.
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| 3. |
- Greiff, Lennart, et al.
(författare)
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Effects of topical platelet activating factor on the guinea-pig tracheobronchial mucosa in vivo
- 1997
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Ingår i: Acta Physiologica Scandinavica. - 0001-6772. ; 160:4, s. 387-391
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Tidskriftsartikel (refereegranskat)abstract
- Platelet activating factor (PAF) has been reported to produce a variety of airway effects including epithelial damage and increased airway-lung absorption of hydrophilic tracers. The present study examines effects of PAF on the guinea-pig tracheobronchial mucosa in vivo. Vehicle with and without PAF (4.0 and 8.0 nmol) was superfused onto the tracheobronchial mucosa. The levels of 125I-albumin, previously given intravenously, were determined in tracheobronchial lavage fluids as an index of mucosal exudation of plasma. The mucosa was also examined by scanning electron microscopy. In separate animals, 99mTc-DTPA (a low molecular weight, 492 Da, hydrophilic tracer) was superfused onto the mucosal surface through an oro-tracheal catheter, together with vehicle or PAF (8.0 nmol). A gamma camera determined the disappearance rate of 99mTc-DTPA from the airways as an index of mucosal absorption. PAF produced dose-dependent mucosal exudation of plasma up to 20-fold greater than control (P < 0.001). However, PAF did not damage the epithelium and the absorption ability of the airway mucosa was unaffected. The results, in contrast to previous reports, suggest that PAF may not readily damage the airway mucosa even at large exudative doses of the agent. The present finding support the view that the plasticity of the epithelial junctions allows the creation of valve-like paracellular pathways for unidirectional clearance of extravasated plasma into the airway lumen. We suggest that endogenous PAF may participate in first line respiratory defence reactions by causing lumenal entry of bulk plasma without harming the epithelium.
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| 4. |
- Kjellgren, Karin I, 1950, et al.
(författare)
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Hypertensive patients' knowledge of high blood pressure.
- 1997
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Ingår i: Scandinavian journal of primary health care. - 0281-3432. ; 15:4, s. 188-92
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To investigate hypertensive patients' understanding of the circulatory system, in particular high blood pressure. DESIGN: Semi-structured audio-taped interviews of patients immediately after a regular follow-up appointment with their physician. SETTING: A primary health care centre and a specialist clinic (hypertension unit) in southern Sweden. PATIENTS: 33 hypertensive patients, consecutively selected. MAIN OUTCOME MEASURE: Focus was set on the exploration of patients' understanding/knowledge. RESULTS: In spite of a long history of hypertensive care, on average ten years, patients had a less than satisfactory understanding of their condition. Most patients knew their blood pressure values, but very few were able to give an account of what high blood pressure implies in functional terms. Knowledge of high blood pressure seems mainly to be derived from sources other than the health care system, in particular from the mass media. Knowledge of the risks associated with hypertension was quite good, as was the insight into how these risks could be managed. CONCLUSION: An assessment of patient knowledge of high blood pressure ought to be a starting point for educational strategies that aim to deepen patients' understanding of their state of health.
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| 5. |
- Kjellgren, Karin I, 1950, et al.
(författare)
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Patients' and physicians' assessment of risks associated with hypertension and benefits from treatment.
- 1998
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Ingår i: Journal of cardiovascular risk. - 1350-6277. ; 5:3, s. 161-6
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Perceptions of effects of a medical regimen may affect patients' adherence to therapy. OBJECTIVE: To assess concordance between patients' and physicians' estimations of the risks of hypertension and benefits of treatment during a regular follow-up appointment. DESIGN: A population-based Swedish multicentre study. Patients were included consecutively from a randomized selection of centres (55 primary health care centres and 11 clinics of internal medicine). METHODS: A questionnaire was given to 1013 patients undergoing their individually prescribed antihypertensive therapy and 212 physicians who were caring for these patients. RESULTS: Without therapy, patients perceived the risks of cardiovascular complications to be higher than did their physicians. Patients were not aware that an increasing number of risk factors has an impact on the risk of complications. Patients furthermore rated the benefits of treatment higher than did their physicians (P<0.001). Of the patients, 14% had blood pressures < or = 140/90 mmHg. Most of the patients (61%) were not aware of their target blood pressure. However, when the target pressure was communicated to patients by the physician, patients remembered it accurately. The patients were generally not willing to trade even minor side effects from antihypertensive therapy for benefits of treatment. CONCLUSIONS: There was a high degree of inconsistency between patients' and physicians' estimations of risks of hypertension. Patients estimated the effects of treatment to be more beneficial than did their physicians.
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| 6. |
- Axelsson, Gösta, 1950, et al.
(författare)
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Shift work, nitrous oxide exposure, and spontaneous abortion among Swedish midwives
- 1996
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Ingår i: Occupational and Environmental Medicine. - 1351-0711. ; 53:6, s. 374-8
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: To study the relation between irregular work hours, nitrous oxide (N2O) exposure, and the risk of spontaneous abortion. METHODS: All 3985 female members of the Swedish Midwives Association in 1989, born in 1940 or later, received a questionnaire on exposure before and during all of their pregnancies. Questions on work conditions covered occupation, extent of employment, workplace, work schedules, use of anaesthetics, and work load. The association between exposure variables and spontaneous abortion was analysed by logistic regression models. RESULTS: Night work and three shift schedules among midwives showed increased odds ratios (ORs) (95% confidence intervals (95% CI)) 1.63 (0.95-2.81) and 1.49 (0.86-2.59), respectively. The ORs of late spontaneous abortions (after the 12th week of pregnancy) was increased for night work 3.33 (1.13-9.87). Use of N2O (> 50% of the deliveries) was not associated with increased risk of spontaneous abortion OR 0.95 (0.62-1.47). Frequent or permanent shortage of staff was related to an increased risk of spontaneous abortions before the 13th week of pregnancy. CONCLUSIONS: The results support the hypothesis that night work and high work load increase the risk of spontaneous abortion.
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| 7. |
- Johansson, C, et al.
(författare)
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Nitric oxide synthase inhibition blocks phencyclidine-induced behavioural effects on prepulse inhibition and locomotor activity in the rat.
- 1997
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Ingår i: Psychopharmacology. - 0033-3158. ; 131:2, s. 167-73
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Tidskriftsartikel (refereegranskat)abstract
- The ability of the nitric oxide synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME), to block the behavioural effects of the potent psychotomimetic, phencyclidine, was tested in rats using two different behavioural models. L-NAME was found to block both phencyclidine-induced disruption of prepulse inhibition of acoustic startle and phencyclidine-induced stimulation of locomotor activity. A selective action of L-NAME on the effects of phencyclidine was indicated, since L-NAME did not alter the effects of amphetamine, another potent psychotomimetic, in these behavioural models. These observations suggest that a nitric oxide-dependent mechanism may be involved in the effects of phencyclidine in the central nervous system.
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| 8. |
- Zhang, Jianhua, 1961, et al.
(författare)
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Repeated administration of amphetamine induces sensitisation to its disruptive effect on prepulse inhibition in the rat.
- 1998
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Ingår i: Psychopharmacology. - 0033-3158. ; 135:4, s. 401-6
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Tidskriftsartikel (refereegranskat)abstract
- Male Sprague-Dawley rats were repeatedly treated with amphetamine (AMP, 1 mg/kg, SC) at 3- day intervals for 15 days and tested for prepulse inhibition of acoustic startle after each treatment. This treatment regimen induced sensitisation in the animals as evidenced by a progressive increase in the disruptive effect of AMP on prepulse inhibition. Persistent changes in brain function was indicated, since an increase in disruptive effect was observed in sensitised animals also after a 22-day-long drug- and test-free period. The development of sensitisation was blocked by pretreatment with haloperidol (HPD, 0.1 mg/kg, SC), which suggests that sensitisation to the disruptive effect of AMP was dependent on dopamine (DA) D2 receptor activation. Furthermore, the development of sensitisation was blocked by adrenalectomy, which suggests that sensitisation was dependent also on circulating adrenal hormones. Increased DA-ergic activity has been implicated in the pathophysiology of schizophrenia and AMP-induced sensitisation to the neuronal functions that modulate prepulse inhibition may be an experimental model to investigate this hypothesis.
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| 9. |
- Nilsson, Bengt-Olof, et al.
(författare)
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Effects of polyamine synthesis inhibition on polyamines, growth and mechanical properties in hypertrophic rat urinary bladder
- 1998
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Ingår i: Pharmacology and Toxicology. - 1600-0773. ; 82:6, s. 287-294
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Tidskriftsartikel (refereegranskat)abstract
- The polyamines putrescine, spermidine and spermine, are ubiquitous intracellular metabolites associated with growth and protein synthesis. In this study effects of polyamine synthesis inhibition on bladder growth, polyamine levels and mechanical properties were investigated in rat urinary bladder subjected to partial outflow obstruction that causes bladder hypertrophy. The S-adenosyl methionine decarboxylase inhibitor CGP-48664 (5 and 20 mg kg-1) was administered alone or in combination with the ornithine decarboxylase inhibitor DFMO (500 mg kg-1), starting one day before creation of partial outflow obstruction and then daily for 7 days. The bladder muscle level of putrescine was increased 38 times and that of spermine reduced by 4 times while spermidine was unchanged after treatment with CGP-48664 (20 mg kg-1). The increase in putrescine was abolished in animals receiving CGP-48664 in combination with DFMO. Treatment with polyamine synthesis inhibitors could not prevent or reduce the hypertrophy of the bladder as judged by bladder wet weight and protein contents. The effects on polyamine quantities were not associated with changes in Ca(2+)-force relationship or in agonist and electrically stimulated force. In summary, treatment of rats with polyamine synthesis inhibitors resulted in changes in polyamine levels in the growing urinary bladder but did not affect growth or mechanical properties.
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| 10. |
- Greiff, Lennart, et al.
(författare)
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Effects of hydrogen peroxide on the guinea-pig tracheobronchial mucosa in vivo
- 1999
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Ingår i: Acta Physiologica Scandinavica. - : Wiley. - 0001-6772 .- 1365-201X. ; 165:4, s. 415-420
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Tidskriftsartikel (refereegranskat)abstract
- Lumenal entry of plasma (mucosal exudation) is a key feature of airway inflammation. In airways challenged with histamine-type mediators and allergen the mucosal exudation response occurs without causing epithelial derangement and without increased airway absorption. In contrast, reactive oxygen metabolites may cause mucosal damage. In this study, involving guinea-pig airways, we have examined effects of H2O2 on airway exudation and absorption in vivo. Vehicle or H2O2 (0.1 and 0.5 M) was superfused onto the tracheobronchial mucosal surface through an oro-tracheal catheter. 125I-albumin, given intravenously, was determined in tracheobronchial tissue and in lavage fluids 10 min after challenge as an index of mucosal exudation of plasma. The tracheobronchial mucosa was also examined by scanning electron microscopy. In separate animals, 99mTc-DTPA was superfused 20 min after vehicle or H2O2 (0.1 and 0.5 M) had been given. A gamma camera determined the disappearance rate of 99mTc-DTPA from the airways as an index of airway absorption. The high dose of H2O2 (0.5 M) produced epithelial damage, increased the absorption of 99mTc-DTPA (P < 0.001), and increased the exudation of plasma (P < 0.001). Notably, it appeared that all extravasated plasma had entered the airway lumen within 10 min. These data demonstrate that H2O2 differs from exudative autacoids such as histamine by causing both epithelial damage and plasma exudation responses. These data also agree with the view that the epithelial lining determines the rate of absorption and is responsible for the valve-like function that allows lumenal entry of extravasated bulk plasma without any increased inward perviousness.
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