Background: The aim of this study was to determine the frequency of resistance to synthetic erythropoietin and factors affecting it among chronic hemodialysis patients in Kerman/ Iran. Methods: This cross- sectional study was performed on chronic hemodialysis patients of three hemodialysis centers in Kerman, Iran during 3 successive months in the summer of 201...

These experiments were designed to study the effects of vasoactive drugs on normal and malignant tissue in W/Fu rats. The increase in resistance to tumor blood flow elicited by a bolus injection of 10 microgram of norepinephrine was greater than that elicited in the surrounding mammary gland tissue. A 10-fold increase in the resistance to tumor blood flow was sustained for 30 min by the infusio...

At cardiac catheterization, the effect of isoproterenol on coronary blood flow was compared in six patients with normal coronary arteries and normal left ventricular function, and eight patients with angiographically defined coronary lesions. Coronary blood flow was measured by selective coronary artery injection of xenon-133 and external monitoring of disappearance curves with a dual probe, di...

Data derived from instantaneous diastolic coronary artery pressure-flow relationships in the dog have suggested that diastolic coronary vascular resistance may be constant and coronary vasoregulation unimportant during individual diastoles. We tested these hypotheses by using constant pressure perfusion to determine the pattern of coronary blood flow during single diastoles under steady state c...

To investigate the effect of alveolar hypoxia on the pulmonary blood flow-segmental vascular resistance relationship, we determined the longitudinal distribution of vascular resistance while increasing blood flow during hyperoxia or hypoxia in perfused cat lungs. We measured microvascular pressures by the micropipette servo-null method, partitioned the pulmonary vessels into three segments [i.e...

We observed the response of vascular resistance and venous oxygen (O2) saturation to sinusoidally modulated continuous exercise of the isolated dog calf. Stimulus frequency was varied sinusoidally between 0.5 Hz and 1 Hz with modulation frequencies ranging from 0.005 Hz to 0.05 Hz. Venous O2 responses were corrected for dispersion due to vascular and catheter transit. As modulation frequency wa...

The use of roller compacted concrete (R.C.C) without conventional cover in important hydraulic structures is investigated through laboratory observation of abrasion phenomena sujected to high velocity flow and floating particles. The main parameters affecting abrasion and erosion resistance of R.C.C. studied in the present study include: "Mixed Hydraulic&#10&#10Mean Radius" (which collectively ...