Results 211 to 220 of about 580,502 (266)
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Pitfalls in the Assessment of Vascular Resistance
Cardiology, 2008Vascular resistance (R) to flow is calculated as the ratio of perfusion pressure between two points (P<sub>1</sub>-P<sub>2</sub>) to flow rate (Q). In high-pressure circuits (e.g., systemic), it is justifiable to use arterial pressure (P<sub>1</sub>) to represent perfusion pressure. It is not permissible to calculate
H S, Badeer, J W, Hicks
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Peripheral pulmonary vascular resistance
Journal of Applied Physiology, 1993The pressure-flow relationship has been studied in a peripheral portion of the lung vasculature in anesthetized dogs with use of a double-lumen catheter wedged in a distal pulmonary artery. One lumen was used to infuse mixed venous blood in the wedged area and the other to measure the corresponding perfusion pressure. Flow ranged from 0 to 9.2 ml/min,
F, Schrijen, C, Saunier, F, Chabot
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Renal Vascular Resistance in Sepsis
Nephron Physiology, 2006<i>Aims:</i> To assess changes in renal vascular resistance (RVR) in human and experimental sepsis and to identify determinants of RVR. <i>Methods:</i> We performed a systematic interrogation of two electronic reference libraries using specific search terms.
Christoph, Langenberg +5 more
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Resistance to Flow in Vascular Beds
Nature, 1958DR. S. D. CARLILL1 has attacked the standard concept of resistance to flow (R) as the ratio of the driving force (the pressure drop P across the bed) to the flow F, and advocates that the ‘dynamic resistance’, that is, the differential dP/dF be substituted. His argument seems to assume what he is trying to prove.
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Intensive Care Medicine, 2003
Almost 20 years ago, Adriaan Versprille published an editorial in this journal to explain why, in his opinion, the calculation of pulmonary vascular resistance (PVR) is meaningless [1]. The uncertainties of PVR were underscored a year later by McGregor and Sniderman in the American Journal of Cardiology [2]. Obviously, both papers failed to convince. A
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Almost 20 years ago, Adriaan Versprille published an editorial in this journal to explain why, in his opinion, the calculation of pulmonary vascular resistance (PVR) is meaningless [1]. The uncertainties of PVR were underscored a year later by McGregor and Sniderman in the American Journal of Cardiology [2]. Obviously, both papers failed to convince. A
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An Index of Peripheral Vascular Resistance
Journal of Hypertension, 1985An index of peripheral vascular resistance, derived from directly measured arterial pressure, has been developed and tested in an animal model. Assuming a mono-exponential character for diastole, the time constant for direct arterial pressure decay in the central aorta was obtained with high-fidelity recording techniques from six anaesthetized dogs ...
J T, Walsh +3 more
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Renal Vascular Resistance in Essential Hypertension
Nephron, 1998letter
Galešić, Krešimir +3 more
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Insulin resistance and vascular function
Journal of Diabetes and its Complications, 2002It has become clear that amongst its many actions insulin is also a vasoactive hormone. Its effect to cause endothelial-nitric oxide-dependent vasodilation is physiologic and dose-dependent. Recent data suggest that insulin's metabolic and vascular actions are closely linked.
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Hematocrit-corrected Pulmonary Vascular Resistance
American Journal of Respiratory and Critical Care Medicine, 2018The diagnosis and evaluation of severity of pulmonary vascular disease rests on the invasive determination of a pulmonary vascular resistance (PVR). It is often overlooked that PVR is linearly related to the viscosity of the blood, which in turn is curvilinearly related to hematocrit.
Vanderpool, Rebecca, Naeije, Robert
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Calculation of coronary vascular resistance
Cardiovascular Research, 1980A conscious, chronically instrumented canine model was used to investigate resistance changes in the distribution of the circumflex coronary artery as the artery was constricted. Several discrete constrictions were studied at two different levels of flow: resting and peak flow reactive hyperaemia.
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