Search results for "Pressure"
showing 10 items of 4493 documents
Nitric Oxide Opposes Myogenic Pressure Responses Predominantly in Large Arterioles In Vivo
1998
Abstract —A myogenic vasoconstriction may amplify the effects of circulating vasoconstrictors. In cremaster arterioles, the contribution of a myogenic component to the constriction on intravenous infusion of norepinephrine (NE) or angiotensin II (Ang II) was studied. Second, the role of endothelium-derived nitric oxide (NO) in the control of these myogenic constrictions and its site of action in the resistance vascular bed was investigated. In 30 anesthetized (pentobarbital) hamsters, the cremaster was prepared for intravital microscopy, and a pneumatic vessel occluder was placed around the aorta to vary blood pressure in the hindquarter of the animal. Intravenous infusion of NE (0.5 nmol/…
Impact of inflammatory markers on cardiovascular mortality in patients with metabolic syndrome.
2008
Recent investigations suggest the inclusion of inflammatory markers in the definition of the metabolic syndrome (MS). The aim of this study was to address the role of C-reactive protein, fibrinogen, interleukin-6 (IL-6) and IL-18 (IL-18) on cardiovascular prognosis in accordance to MS.A total of 1263 patients with documented coronary artery disease were prospectively included. We defined MS (MS yes: N=533, 42.2%) as the presence of at least three of the following criteria: triglyceridesor=150 mg/dl; low high-density lipoprotein cholesterol (men:40 mg/dl women:50 mg/dl); body mass index greater than 30 kg/m; blood pressureor=130/85 mmHg; fasting glucoseor=100 mg/dl. In addition, we determine…
ANTI-ARRHYTHMIC EFFECT OF DEHYDROBENZPERIDOL IN DOGS
1971
SUMMARY The anti-arrhythmic activity of dehydrobenzperidol (DBP) was studied during halothane anaesthesia in dogs. Arrhythmias were provoked by single intravenous injections of catecholamines. Two groups of dogs were studied. One received norepinephrine and the odier epinephrine. The dose just sufficient to initiate arrirythmias was defined as the “threshold”. Electrocardiogram, blood pressure and heart rate were monitored. The principal findings were:— 1 The dog heart was “sensitized” to epinephrine and norepinephrine by halothane. 2 DBP did have an anti-arrhydimic action. A dose of 0.150 mg/kg roughly doubled the “threshold”. 3 DBP had significant alpha-adrenergic blocking properties. …
Changes in lipid metabolism and antioxidant defense status in spontaneously hypertensive rats and Wistar rats fed a diet enriched with fructose and s…
2005
Abstract Objective Larger doses of fructose and saturated fat have been associated with oxidative stress and development of hypertension. The effects of modest amounts of fructose and saturated fatty acids on oxidative stress are unknown. Methods To increase knowledge on this question, 10-wk-old spontaneously hypertensive rats and Wistar rats were fed for 8 wk with a control diet or an experimental diet enriched with fructose (18%) and saturated fatty acids (11%; FS diet). The total antioxidant status of organs and red blood cells was assayed by monitoring the rate of free radical-induced red blood cell hemolysis. Sensitivity of very low-density lipoprotein and low-density lipoprotein (VLDL…
Effect of Glutathione on Canine Myocardial Ischaemia Without Reperfusion
1993
Abstract The present study was to evaluate the effect of exogenous glutathione on myocardial damage resulting from permanent (no reperfusion) coronary ligation (3 or 6 h) in anaesthetized dogs. Haemodynamics, infarct size and myocardial glutathione content were determined. Erythrocyte superoxide dismutase (SOD) activity was also determined in coronary venous blood samples. Glutathione was administered by the intraperitoneal route, 100 mg kg−1 as initial dose given 5 min before coronary ligation, and successive doses of 25 mg kg−1 every 40 min throughout the study period. Saline-treated dogs showed myocardial infarction, a decrease in myocardial glutathione content, and a transient increase …
Prevention of pressure injuries in critically ill children: A preliminary evaluation
2020
Abstract Aims To evaluate a prevention strategy implemented to reduce incidence and severity of positioning related pressure injuries affecting pediatric patients in a pediatric critical care unit. Secondary objective was to evaluate compliance with preventive recommendations. Background The skin in infants or children has important physiological and anatomical differences compared with adults. Further, factors such as the immaturity of the skin and limited activity and mobility in pediatric critical care unit, along with the pressure exerted by medical devices, increases the risk of pressure ulcers in infants and children. The most effective preventive measures specific to this intensive c…
Maternal Treatment of Spontaneously Hypertensive Rats With Pentaerythritol Tetranitrate Reduces Blood Pressure in Female Offspring
2014
Pentaerythritol tetranitrate is devoid of nitrate tolerance and shows no reproductive or developmental toxicity in animal studies. Recently, pentaerythritol tetranitrate has been demonstrated to reduce the risk of intrauterine growth restriction and the risk of preterm birth in women with abnormal placental perfusion. This study was conducted to test the perinatal programming effect of pentaerythritol tetranitrate in spontaneously hypertensive rats, a rat model of genetic hypertension. Parental spontaneously hypertensive rats were treated with pentaerythritol tetranitrate (50 mg/kg per day) during pregnancy and lactation periods; the offspring received standard chow without pentaerythritol …
Effects of calcium channel blockers on gastric emptying and acid secretion of the rat in vivo.
1986
Abstract Experiments were designed to evaluate the effects of three calcium channel blockers (verapamil, diltiazem and cinnarizine) on gastric emptying and secretion in the rat. Pretreatment with the calcium blockers delayed gastric emptying of phenol red in a dose-dependent manner. Verapamil was the most effective of the agents tested. Verapamil and diltiazem inhibited gastric acid secretion in the pylorus-ligated rat without affecting pepsin output. Cinnarizine was ineffective in this model. When the perfused lumen of the anaesthetized rat was used, verapamil was found to inhibit responses to carbachol or histamine more than those to pentagastrin. Further, we found a greater sensitivity t…
Importance of HDL cholesterol levels and the total/ HDL cholesterol ratio as a risk factor for coronary heart disease in molecularly defined heterozy…
2001
Aims To assess the relationship of the lipid profile to coronary heart disease in a group of heterozygous familial hypercholesterolaemic subjects with similar age, sex, body mass index, prevalence of angiotensin converting enzyme DD genotype and type of low density lipoprotein receptor mutation. Methods and Results A total of 66 molecularly defined heterozygous familial hypercholesterolaemic subjects, 33 of whom had coronary heart disease, were studied. Clinical features, cardiovascular risk factors and lipid parameters were compared in both groups. Familial hypercholesterolaemic patients with coronary heart disease showed significantly lower values of mean plasma HDL cholesterol and a high…
Pulmonary vascular resistance versus pulmonary artery pressure for predicting right ventricular remodeling and functional tricuspid regurgitation.
2018
BACKGROUND Pulmonary hypertension (PH) is a common cause of right ventricular (RV) remodeling and functional tricuspid regurgitation (FTR), but incremental pulmonary artery systolic pressure (PASP) does not always correlate with anatomic and functional RV changes. This study aimed to evaluate a noninvasive measure of pulmonary vascular resistance (PVR) for predicting RV dilatation, RV dysfunction, and severity of FTR. METHODS We prospectively analyzed consecutive stable patients with PASP ≥ 35 mm Hg or any degree of RV dilatation or dysfunction secondary to PH. Noninvasive PVR was calculated based on FTR peak velocity and flow in RV outflow tract. RESULTS We included 251 patients, aged 72.1…