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Radioimmunoassay of plasma arginine-vasopressin (AVP) in regularly dialyzed patients with chronic renal insufficiency revealed a parallel increase of AVP and plasma osmolality (POsm) before dialysis (4.16 +/- 0.36 pg/ml and 312.6 +/- 1.80 mOsm/1) and their parallel declin to the normal range (1.93 +/- 0.27 pg/ml and 292.0 +/- 1.27 mOsm/1) during dialysis. Plasma AVP correlated with POsm before and after dialysis (r = 0.611 and 0.453, p less than 0.01 and less than 0.05 respectively). The increase of AVP before dialysis was lower than would correspond to the rise of POsm and lower than that recorded in healthy subjects during dehydration. Statistical correlation between plasma AVP and indicators of body fluid volume changes between or during dialysis were not proved. We found statistical correlation between the mean blood pressure and AVP before dialysis (r = 0.468, p less than 0.05). These findings suggest that in chronic renal insufficiency changes of POsm remain primary regulating factor of AVP secretion. The expansion of extracellular fluid volume has probably only a modifying effect. It remains to be elucidated whether the revealed statistical relationship between the mean blood pressure and AVP before dialysis plays also a pathogenetic role in the development of hypertension in chronic renal insufficiency.
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