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- W2079792046 abstract "Cardiac and renal hemodynamics and total blood volume were determined in 28 normal subjects and 60 patients with untreated essential well-established hypertension. Endogenous creatinine clearance was within normal ranges and sodium intake was 110 mEq/day. A significant negative volume-resistance relationship was observed both in normal subjects (P less than 0.005) and hypertensive patients (P less than 0.001). In comparison with the normal curve, the hypertensive curve has two characteristics: 1) the curve was reset on the right-hand side and, 2) the slope was significantly shallower, indicating a reduced ability to decrease the volume per unit rise in resistance. By using the normal curve as a reference system, a quantitative evaluation of the blood volume disturbance was proposed. In hypertensives, the value of the total peripheral resistance could correspond to two different values of the total blood volume: the real value and the theoretical value extrapolated from the normal curve. The difference between the two values was called relative variation in blood volume and was used as a mathematical model. In hypertensives, the real blood volume was significantly reduced (P less than 0.001) while a significant relative increase in total blood volume was observed (P less than 0.001). This relative increase was directly correlated with the diastolic arterial pressure (r=0.064; P less than 0.00001) and was inversely related to the renal blood flow (r=-0.54; P less than 0.0001) and the creatinine clearance. Such correlations were not observed with the real blood volume. In agreement with Guyton's theory, this study highly suggests that sustained hypertension is related to an increase in blood volume relative to the capacity of the circulatory system and that a renal defect is necessary for the blood pressure elevation mechanism." @default.
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- W2079792046 date "1975-07-01" @default.
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- W2079792046 title "Altered blood volume regulation in sustained essential hypertension: A hemodynamic study" @default.
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- W2079792046 doi "https://doi.org/10.1038/ki.1975.74" @default.
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