a periodic increase in blood pressure (bp) occurs during apneic episodes in patients with obstructive sleep apnea (osa). several factors including hypoxemia and an increase in heart rate (hr) were reported to be responsible for this increased bp. to examine the contribution of these two factors in increasing bp, 35 healthy male subjects (mean age±sd= 23.64±3.80) were studied in three experiment...

objective: for many years in herbal medicine the antihypertensive and lowering blood lipid properties of achillea wilhelmsii (a. wilhelmsii) have been suggested. in the present study the impacts of the plant extract on rabbit’s blood pressure and heart rate have been investigated. materials and methods: twelve nwz rabbits weighed 2-3 kg were randomly divided into two groups of 6 rabbits. the te...

background: normal standard references of blood pressure (bp) for children and adolescents have been suggested to be constructed based on anthropometric indices. accordingly, we aimed to develop first bp reference percentiles by weight and age for iranian children aged 3-18 years old. materials and methods: a total of 16,246 children and adolescents aged 3-18 years were included from 3 cross-se...

background : hypertension is a risk factor for life threatening diseases such as cerebrovascular accidents, coronary artery diseases, congestive heart failure and chronic renal failure. the prevalence of non-communicable diseases such as hypertension and diabetes including obesity has increased over the past few years in iran. the first step for modification of cardiovascular diseases in a defi...

background: both vitamin d deficiency and hypertension are prevalent in the general population. several observations indicate an association between vitamin d deficiency and high blood pressure. the present case-control study aimed to compare serum 25-hydroxyvitamin d (25-ohd) in hypertensive patients versus healthy controls. methods: one hundred patients aged 30-60 years with hypertension (htn...

The dynamics of the cerebral vascular response to blood pressure changes in hypertensive humans is poorly understood. Because cerebral blood flow is dependent on adequate perfusion pressure, it is important to understand the effect of hypertension on the transfer of pressure to flow in the cerebrovascular system of elderly people. Therefore, we examined the effect of spontaneous and induced blo...

introduction: epinephrine-containing lidocaine is the most used anestheic drug in dentistry. the aim of this study was to investigate the hemodynamic changes following local infiltration of 2%lidocaine with 1:80,000 epinephrine in subjects undergoing orthognatic surgery under general anesthesia. methods: twenty five patients without any systemic disease participated. after general anesthesia, t...

An interpretive model of the myogenic autoregulatory response of cat mesenteric arterioles has appeared in the literature; it describes arteriolar dimensional changes during changes in mean systemic arterial blood pressure in terms of tension-radius diagrams (Laplace relationship). The original model assumes that arteriolar pressure is a simple, linear function of systemic blood pressure and th...