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Biomedical subjects

A Kaviani

Publications and source records attributed to A Kaviani.

9 recordsLinked to original sources
PubMed2004

Patient satisfaction: a descriptive study of a breast care clinic in Iran.

A descriptive study was carried out to examine patient satisfaction among women attending the Iranian Centre for Breast Cancer. A specially designed patient satisfaction questionnaire was distributed to all attendees and they were asked to complete the questionnaire. The questionnaire contained items on satisfaction with care organization, physical environment, personnel communication skills, clinical care, and overall satisfaction. In all, 425 women participated in the study. The mean age of women was 40.4 years (SD = 11.6), most were married (81%) and housewives (69%). A vast majority of women were very satisfied or satisfied with physical environment, personnel communication skills, and clinical care received. Eighty-two per cent of respondents were very satisfied or satisfied with the clinic's overall performance. There was a significant agreement between patients' overall satisfaction and satisfaction with physical environment, personnel communication skills, and clinical care. There was greatest agreement between patients' overall satisfaction and satisfaction with examination room (Kappa = 0.21, P < 0.0001) and with physicians' consultation (Kappa = 0.20, P < 0.0001). None of the demographic variables showed any significant association with patients' overall satisfaction. The findings suggest that the physical environment and physicians' style of consultation contribute most to the patients' overall satisfaction.

Adult↗
PubMed2001

The amniotic fluid as a source of cells for fetal tissue engineering.

PURPOSE: This study was aimed at determining whether fetal tissue constructs can be engineered from cells normally found in the amniotic fluid. METHODS: A subpopulation of morphologically distinct cells was isolated mechanically from the amniotic fluid of pregnant ewes (n = 5) and expanded selectively. Its lineage was determined by immunofluorescent staining against multiple intermediate filaments and surface antigens. Proliferation rates were determined by both oxidation and total DNA assays and compared with immunocytochemically identical adult and fetal sheep cells. Statistical analysis was by analysis of variance for repeated measures (ANOVA). After expansion, the amniocytes were seeded onto a polyglycolic acid polymer/poly-4-hydroxybutyrate scaffold. The resulting construct was analyzed by both optical and scanning electron microscopy. RESULTS: The immunocytochemical profile of expanded amniocytes was consistent with a mesenchymal, fibroblast/myofibroblast cell lineage. These cells proliferated significantly faster than comparable fetal and adult cells in culture. Amniocyte construct analysis showed dense, confluent layers of cells firmly attached to the scaffold, with no evidence of cell death. CONCLUSIONS: (1) Subpopulations of fetal mesenchymal cells can be isolated consistently from the amniotic fluid. (2) Mesenchymal amniocytes proliferate more rapidly in vitro than comparable fetal and adult cells. (3) Mesenchymal amniocytes attach firmly to polyglycolic acid polymer. The amniotic fluid can be a reliable and practical source of cells for the engineering of select fetal tissue constructs.

Amniotic Fluid↗
PubMed1998

Hypercalcemia in malignant paraganglioma due to parathyroid hormone-related protein.

A 15-year-old boy had hypercalcemia in association with malignant retroperitoneal paraganglioma. He had suppressed circulating levels of intact parathyroid hormone, whereas parathyroid hormone-related protein (PTHrP) immunoreactivity was elevated in plasma. Both the serum 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D levels were normal. Preoperatively the patient required control of hypercalcemia with intravenous pamidronate therapy. His circulating calcium and PTHrP concentrations became normal after a successful surgical resection of the primary retroperitoneal tumor. To our knowledge, this is the first reported case of elevated PtHrP levels in a patient with paraganglioma which resolved postoperatively.

Adolescent↗
PubMed1993

Time course of altered thyroid states on 5-HT1A receptors and 5-HT uptake sites in rat brain: an autoradiographic analysis.

Although a link between the hypothalamic-pituitary-thyroid (HPT) axis and affective disorder has been established, the mechanism underlying this relationship remains unclear. Since the serotonin (5-HT) system appears to be involved in the pathophysiology of mood disorders, the time course of the effects of thyroidectomy (TXT) with or without thyroxine (T4) replacement on 5-HT1A receptors and 5-HT uptake sites was examined. TXT caused a significant increase in 3H-8-hydroxy-2-(di-n-propylamino)-tetralin (3H-DPAT) binding to 5-HT1A receptors in the cortex and hippocampus at 7 days and this increase was also evident at 35 days following TXT. By contrast, TXT did not have a significant effect on 3H-DPAT binding in the hypothalamus or in the dorsal raphe nucleus. TXT did not affect the binding of 3H-cyanoimipramine (3H-CN-IMI) to 5-HT uptake sites in any of the brain regions analyzed, or at any of the time points studied. Administration of high-dose T4 for 28 days caused the binding of 3H-DPAT to recover to sham levels in the cortex, to increase in the hippocampus and hypothalamus, and had no effect in the dorsal raphe nucleus. Replacement with high-dose T4 had no effect on 3H-CN-IMI binding to 5-HT uptake sites when compared to sham-operated animals at all time points examined. These results suggest that a neuromodulatory link may exist between the HPT axis and 5-HT1A receptors in the limbic regions of the rat brain. Depending on the brain region examined, a differential response to circulating levels of thyroid hormone was observed.

8-Hydroxy-2-(di-n-propylamino)tetralin↗
PubMedDate not supplied

Tumor necrosis factor-alpha regulates inducible nitric oxide synthase gene expression in the portal hypertensive gastric mucosa of the rat.

Increased expression of both nitric oxide synthase (NOS) and tumor necrosis factor-alpha (TNF-alpha) have been implicated in the hyperdynamic circulation of portal hypertension. Since overexpression of these proteins would affect gastric mucosal defenses, which are impaired in portal hypertension, we examined the expression and interrelationships of TNF-alpha and NOS in the gastric mucosa of portal hypertensive rats. Following staged portal vein ligation, gastric strips from portal hypertensive rats were incubated in organ culture medium with or without TNF-alpha antibody. The expression of TNF-alpha and NOS mRNAs was assessed by reverse transcription-polymerase chain reaction (RT-PCR) at baseline and after 1, 2, and 6 hours of incubation. RT-PCR demonstrated a threefold increase in inducible NOS mRNA and a 50% increase in TNF-alpha mRNA expression at baseline in portal hypertensive animals as compared to sham-operated animals. In tissue incubated with TNF-alpha neutralizing antibody, inducible NOS mRNA expression was significantly decreased by 40%, 70%, and 80% after 1, 2, and 6 hours, respectively. Since increased TNF-alpha and NOS production could potentially impair gastric mucosal defenses, our findings suggest a major role for these proteins in the development of portal hypertensive gastropathy.

Animals↗
PubMedDate not supplied

Portal hypertension triggers local activation of inducible nitric oxide synthase gene in colonic mucosa.

Recently a new clinical entity "portal hypertensive colopathy" has been reported. It involves vascular abnormalities and bleeding. Because nitric oxide may mediate these changes, we studied whether portal hypertension affects nitric oxide synthase in portal hypertensive colonic mucosa. In portal hypertensive and sham-operated rats the following studies were done: (1) colonic mucosal blood flow, (2) quantitative histologic examination, (3) reverse transcription-polymerase chain reaction for nitric oxide synthase mRNA, (4) nitric oxide synthase activity assay, and (5) immunostaining for nitric oxide synthase. In portal hypertensive rats, colonic mucosal blood flow and the number of submucosal veins were significantly increased in comparison to sham-operated rats. The mRNA expression and enzyme activity for inducible nitric oxide synthase (but not constitutive nitric oxide synthase) were significantly increased in portal hypertensive rats. Fluorescence signal intensity for inducible nitric oxide synthase in endothelia of mucosal and submucosal veins was significantly higher in portal hypertensive rats than in sham-operated rats. Portal hypertension activates inducible nitric oxide synthase gene and protein in colonic mucosal vessels. The excess of nitric oxide generated by overexpressed inducible nitric oxide synthase may play an important role in the development of vascular and hemodynamic abnormalities characterizing portal hypertensive colopathy.

Animals↗