Perivascular nitric oxide delivery to saphenous vein grafts prevents graft stenosis after coronary artery bypass grafting: a novel sheep model.

OBJECTIVES: Graft stenosis is a major complication of coronary artery bypass grafting with autologous saphenous vein grafts. Nitric oxide (NO) is believed to prevent this phenomenon. We studied the effect of perivascular application of an NO donor on the degree of stenosis of such grafts in an ovine model. METHODS: Twenty white Iranian ewes were randomized to coronary artery bypass grafting using autologous saphenous vein grafts with application of an elastomer gel containing diethylenetriamine NO adduct in 0.9% sodium chloride solution around the grafted vessel (intervention group) or with the gel containing the saline solution alone (controls). Graft vessels were studied after 1 year using spot angiography and histological examination. RESULTS: The mean degree of stenosis was significantly lower in the intervention group than in the controls as found by histology (92.3 ± 5.5 vs. 80.9 ± 8.3%; p = 0.004). Although the difference in the angiographic score was not significant, the mean score was still lower in the intervention group (9.5 ± 11.3 vs. 12.0 ± 11.8). CONCLUSIONS: Perivascular application of an NO donor was, at least histologically, effective in reducing graft stenosis in our ovine model. This can be a step toward the development of drug-eluting coronary artery bypass grafts.

Atherosclerosis and vascular injury: the effect of a perivascular nitric oxide donor in a cholesterol-fed rabbit model.

Nitric oxide (NO) has been shown to prevent neointimal hyperplasia and decrease atherosclerosis in several animal models. It is a major modulator of vascular homeostasis and has vasoprotective effects against atherosclerosis. However, NO-based therapies with such purposes have not been used in the clinical arena. Our objective was to combine a medical grade elastomer and an NO donor, diethylenetriamine NO adduct (DETA/NO), to determine whether its perivascular administration can attenuate atherosclerosis and vascular injury. Aortic intimal injury was produced using paediatric pulmonary valvoplasty catheter in 22 healthy male New Zealand White rabbits, which were fed a high-cholesterol diet for 4 weeks beforehand. A mixture of the elastomer Silastic and DETA/NO was applied locally to cover the aortas in the experiment group. After 6 additional weeks on the high-cholesterol diet, the aortas and blood samples were harvested for pathologic analysis and comparison with the control group. Mean atherosclerosis and vascular injury surface area was 6.68 x 10(5) microm2 in the experiment group, compared with 3.44 x 10(5) microm2 in the controls. However, there was no statistically significant difference in atherosclerotic surface area between the two groups. Perivascular application of the NO donor DETA/NO, in the concentration we used, did not prevent atherosclerosis in high cholesterol-fed rabbits. This finding prompts more careful assessment before possible clinical uses.

Caesarean or normal vaginal delivery: overview of physicians' self-preference and suggestion to patients.

PURPOSE: Caesarean delivery in the absence of any medical indications has become a major issue of concern among the women's health professionals. The patients' choice of caesarean is influenced by several factors predominating by their physicians' suggestion. Our objective was to examine factors that may affect the physicians' responses to patients consulting the mode of delivery. METHODS: Questionnaires were posted to 1,000 female obstetricians and gynaecologists practicing in Tehran in winter 2007. Questionnaires included demographic information of physicians and their history of pregnancy and delivery. Finally, they were asked their preferred mode of delivery and the mode they suggest when being consulted by parturient. RESULTS: From 1,000 physicians, 785 cases (78.5%) responded to the survey. The rate of responses in favour of suggesting normal vaginal delivery, Caesarean Section and painless vaginal delivery was 60.8, 25.6 and 13.6%, respectively. There was a correlation between the suggested and the preferred mode of delivery, it means that the physicians mostly suggested their self-preferred mode of delivery to their patients. CONCLUSIONS: Physicians normally suggest to their patients as the safe mode of delivery what they prefer for themselves. This preference and subsequent suggestion is influenced by different factors including their age, marital status, and previous modes of delivery. As conclusion, it is inferred that informing a physician to choose the right mode of delivery for herself leads to better suggestions to the patients.

Diagnoses, requests and timing of 503 psychiatric consultations in two general hospitals.

The high comorbidity of medical and psychiatric diagnoses in the general hospital population requires collaboration between various medical fields to provide comprehensive health care. This study aims to find the rate of psychiatric consultations, their timing and overall diagnostic trend in comparison to previous studies. Tehran University of Medical Sciences has got an active psychiatric consultation-liaison service which includes services provided by four faculty psychiatrists (two full-time and two part-time). This study was done in two general hospitals by simple sampling in available cases. For each consultation, a board-certified faculty psychiatrist conducted a clinical evaluation based on DSM-IV-TR. Other than psychiatric diagnoses, socio-demographic variables, relative consultation rates, reasons for referral, medical diagnoses and the time stay after admission were assessed. Among 503 patients who were visited by the consultation-liaison service, there were 54.3% female with mean age of 39.8 years. In 90.1% of consultations, at least one DSM-IV-TR diagnosis was made. The most frequent diagnosis groups were mood disorder (43.5%), adjustment disorder (10.9%) and cognitive disorder (7.6%). In about 10.9% of the consultations, multiple psychiatric diagnoses were made. The mean length of hospital stay before the consultation was 12.56 days (range=1-90, SD=13). Based on our findings, the mood and cognitive disorders still remain major foci of consultation-liaison practice in general hospitals; however our findings showed high rate of adjustment disorders diagnosis and ambiguous request for psychiatric consultation which need more interdisciplinary interaction.

Mental health in patients with pemphigus: an issue to worth consideration.

BACKGROUND: There exists a high prevalence of psychiatric disorders in dermatological patients. Although, investigators have evaluated psychiatric aspects of the patients suffering from skin diseases; there are rare studies concerning mental health in pemphigus patients. The objective of this study was to evaluate mental health status and quality of life of newly diagnosed pemphigus patients. MATERIALS AND METHODS: Between April 2007 and June 2008, all newly diagnosed pemphigus patients attending the outpatient clinic of a dermatological hospital were given a questionnaire comprising the GHQ-28 and DLQI to fill out. RESULTS: Of 283 patients, 212 complete forms were returned. The bimodal score of GHQ ranged from 0 to 26 (Mean = 9.4) and the Likert score of GHQ ranged from 6 to 68 (Mean = 31.9). The DLQI score ranged between 0 and 30 (Mean of 13.8). A total of 157 patients (73.7%) were yielded to be possible cases of mental disorder considering GHQ-28 bimodal scores. Significant correlation was detected between the DLQI score and bimodal and Likert scoring of GHQ-28. CONCLUSION: Our study has depicted high prevalence of psychiatric comorbidity in pemphigus patients. It underlines the fact that physicians, who are in-charge of care for these patients, are in an exceptional position to distinguish the psychiatric comorbidity and to take appropriate measures.