Results 201 to 210 of about 965,518 (261)

Pulmonary vascular resistance and vascular transmural gradient

Journal of Applied Physiology, 1960
Perfusion studies were made on vascular beds of isolated dog lungs. Submerged, gas-free, fluid-distended lobes served for studies of resistance versus transmural pressure in a technique that abolished gravitational effects. Air-distended lobes with varying degrees of pulmonary edema were used to display the transmural gradient differences produced by ...
T C, LLOYD, G W, WRIGHT
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Renal washout and vascular resistances

European Journal of Nuclear Medicine, 1987
Evaluation of the vascular transit through a transplanted kidney depends on the convolution of the arterial bolus in the renal vasculature. In order to stress the importance of the renal artery, an example where a moderate stenosis resembled allograft rejection is given.
S L, Nielsen, K, Hvid-Jacobsen, H S, Thomsen, O, Munck   +3 more
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Vascular resistance in splenic perfusion

Journal of Surgical Research, 1968
Abstract Eighteen pig spleens have been perfused ex vivo, 9 each with heterologous and homologous blood. Angiographic evidence of spasm in the main splenic arteries probably caused the temporary early resistance to perfusion, with both homologous and heterologous blood.
A R, Moore, C J, Mieny, B, Eiseman
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Pulmonary Vascular Resistance in Emphysema

Chest, 1994
To assess the hemodynamic effects of pulmonary microvasculature disruption in emphysema, we examined resting pulmonary hemodynamics and lung function in 12 carefully identified patients with type A chronic obstructive pulmonary disease. Individuals with respiratory muscle weakness and intercurrent infection were excluded.
L L, Schulman, P F, Lennon, J A, Wood, Y, Enson   +3 more
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HYPERTENSION AND COMPONENTS OF VASCULAR RESISTANCE

Clinical and Experimental Pharmacology and Physiology, 1991
SUMMARY1. In renal wrap hypertension in the rabbit and in essential hypertension in humans, non‐autonomic components of resistance are the major factors contributing to elevated blood pressure.2. The central nervous system plays an important role in moment to moment blood pressure control but is not responsible for maintenance of elevated pressure in ...
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Pitfalls in the Assessment of Vascular Resistance

Cardiology, 1994
Vascular resistance (R) to flow is calculated as the ratio of perfusion pressure between two points (P1-P2) to flow rate (Q). In high-pressure circuits (e.g., systemic), it is justifiable to use arterial pressure (P1) to represent perfusion pressure. It is not permissible to calculate resistance without measuring Q unless a comparison is being made in ...
H S, Badeer, J W, Hicks
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Peripheral pulmonary vascular resistance

Journal of Applied Physiology, 1993
The 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, Rinaldo, Bellomo, Clive N, May, Moritoki, Egi, Li, Wan, Stanislao, Morgera   +5 more
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Resistance to Flow in Vascular Beds

Nature, 1958
DR. 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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Pulmonary vascular resistance

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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