Extracellular Fluid Volume and Renal Indices in Essential Hypertension

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Abstract
Extracellular fluid volume (EFV), total blood volume (TBV) and renal indices were determined in 53 permanent essential hypertensive patients with normal renal function and balanced Na intake and urinary output. In comparison with normal subjects, hypertensives had normal EFV values while TBV and the TBV/EFV ratio were significantly reduced (P < 0.001). In hypertensives, a significant negative relationship (r [correlation coefficient] = -0.40; P < 0.005) was observed between the TBV/EFV ratio and diastolic arterial pressure. No correlation existed between TBV and diastolic pressure, whereas EFV (and also interstitial fluid volume) was positively related to diastolic arterial pressure (r = +0.41; P < 0.005). Extracellular fluid volume and interstitial fluid volume were directly correlated to the renal filtration fraction (r = +0.45; P < 0.005). In the disturbed partition of the extracellular fluid of hypertensives, changes in the interstitial space are apparently involved and are related to variations in the renal indices.