Right atrial pressure: determinant or result of change in venous return?
نویسنده
چکیده
According to the concept of Guyton, cardiac output is largely controlled by venous return, which is determined by the difference between mean systemic venous pressure and right atrial pressure. In the analysis of the venous return curve, other authors have suggested that right atrial pressure is the dependent variable and venous return is the independent variable (right atrial pressure decreased because cardiac output increased). The present report analyzes this historical debate, which has already lasted > 50 years.
منابع مشابه
Venous return at various right atrial pressures and the normal venous return curve.
GUYTON, ARTHUR C., ARTHUR W. LINDSEY, BERRY ABERNATHY AND TRAVIS RICHARDSON. (U. Mississippi School Med., Jackson.) Vertous rehwn at vurious right atrial pressures and the normal venous retum curve. Am. J. Physiol. 189(s): 609-615. 1957.The normal venous return curve has been determined in I 2 open-chest dogs with intact circulatory reflexes andin 14 openchest areflex dogs. These curves show th...
متن کاملUnderstanding Guyton's venous return curves.
Based on observations that as cardiac output (as determined by an artificial pump) was experimentally increased the right atrial pressure decreased, Arthur Guyton and coworkers proposed an interpretation that right atrial pressure represents a back pressure restricting venous return (equal to cardiac output in steady state). The idea that right atrial pressure is a back pressure limiting cardia...
متن کاملA critical analysis of the view that right atrial pressure determines venous return.
A. C. Guyton pioneered major advances in understanding cardiovascular equilibrium. He superimposed venous return curves on cardiac output curves to reveal their intersection at the one level of right atrial pressure (Pra) and flow simultaneously consistent with independent properties of the heart and vasculature. He showed how this point would change with altered properties of the heart (e.g., ...
متن کاملVenous Return at Various Right Atria1 Pressures and the Normal Venous Return Curve’
GUYTON, ARTHUR C., ARTHUR W. LINDSEY, BERRY ABERNATHY AND TRAVIS RICHARDSON. (U. Mississippi School Med., Jackson.) Vertous rehwn at vurious right atrial pressures and the normal venous retum curve. Am. J. Physiol. 189(s): 609-615. 1957.The normal venous return curve has been determined in I 2 open-chest dogs with intact circulatory reflexes andin 14 openchest areflex dogs. These curves show th...
متن کاملMethoxamine in Anesthetized Dogs
We studied effects on venous return of aand /8-adrenergic agonists in anesthetized dogs. Blood from the superior and inferior venae cavae (venous return) was drained at the level of the tricuspid valve into a reservoir, from which blood was pumped into the right atrium at a constant rate. Isoproterenol infused into the ascending aorta or the right atrium increased the venous return and heart ra...
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ورودعنوان ژورنال:
- Chest
دوره 128 5 شماره
صفحات -
تاریخ انتشار 2005