The Incidence Rate of Vasovagal Reactions and Its Effective Factors among Blood Donors in Mashhad Blood Transfusion Centers

Aims: Vasovagal reaction is one of the most common complications of blood donation, this study was conducted to determine the prevalence of vasovagal reactions and its effective factors among blood donors in Mashhad blood transfusion centers. Materials & Methods: This case-control study was performed on 657 blood donors in Mashhad's four blood transfusion centers during 6 months. The donors who had vasovagal reactions were in the case group (218 cases), and 439 donors who did not respond to vasovagal were in the control group. The age, BMI, blood pressure, pulse rate, hematocrit and vasovagal response variables were studied. Data were analyzed by SPSS 11.5 using Chi-square and Mann-Whitney tests. Findings: The incidence of vasovagal reactions in the six months was 2.16%. The mean age in the case group was significantly lower than the control group (p<0.001). Vasovagal reactions were significantly higher in women and in first-time donors, as well as in those with anxiety and in subjects with lower BMI (p<0.001). The mean reduction in arterial pressure after blood donation was significantly higher in the case group than in the control group (p<0.001). Conclusion: The incidence of vasovagal reactions is dependent on several factors, including age, sex, BMI, and blood pressure, and with more care from high-risk donors, it can be approximately prevented from vasovagal reaction and increased the possibility of returning to blood donation

Effect of Intrapertonal Injection of Crocin on Cardiovascular Parameters in Angiotensin II- Induced Hypertensive Rats

Aims: The antihypertensive effect intravenous injection of Cronin has been observed in our previous study. In this study, the effect of intraperitoneal (ip) injection of Crocin on hypertension induced by angiotensin II (Ang II) with dose of 50 ng/kg was investigated in rats. Materials & methods: In current excremental study, thirty male Wistar rats were randomly divided into 5 groups: Control (Cont), Ang II50, Losartan (Los) + Ang II, (Cro) 100 + Ang II and Cro200 + Ang II (n = 6 in each group). To induce hypertension, Ang II (50 ng/kg, i.v) was administered. Los (10 mg/kg, i.v) and Cro (100 and 200 mg/kg, ip) were administered 30 min before Ang II. Systolic blood pressure (SBP), mean arterial pressure (MAP) and heart rate (HR) after cannulation of the artery were continuously recorded by power lab system then,(Δ;difference before and after injection) were calculated and compared between the groups. Differences were considered significant when P< 0.05. Findings: Ang II significantly increased SBP, MAP and decreased HR in several minutes (P<0.001). Losartan reduced these effects of angiotensin II. Pre-treatment with crocin (ip) significantly attenuated increased SBP and MAP induced by AngII (P<0.01) but it has not important effect on HR Conclusion: Injection of crocin (ip) and it's effect on the AT1 receptor reduces hypertension induced by the dose of 50 ng/kg of Ang II, which is comparable to that of Losartan. Therefore, the cardiovascular effect of crocin probably is mediated by this receptor of AngII