title: Change in plasma immunoreactive atrial natriuretic peptide during sequential ultrafiltration and haemodialysis.
abstract: Plasma immunoreactive human atrial natriuretic peptide (Ir-ANP) levels were measured in eight patients with chronic renal failure who were volume-expanded and during treatment by sequential ultrafiltration and haemodialysis. One patient was studied at two separate treatment sessions. Plasma Ir-ANP levels were raised in all patients (mean +/- SE 184 +/- 44 pmol/l, n = 9) compared with healthy controls (11 +/- 1.4 pmol/l), but showed considerable inter-patient variability. Plasma Ir-ANP levels fell with fluid removal during ultrafiltration (123 +/- 30 pmol/l, n = 9, P less than 0.02) and again as fluid was removed during haemodialysis (76 +/- 20 pmol/l, n = 9, P less than 0.02). Seven patients studied 48 h later, before their next dialysis treatment, had regained weight and showed a coincident rise in circulating plasma Ir-ANP (130 +/- 33 pmol/l, n = 7). Our data would support the hypothesis that the secretion of ANP is determined by volume or by a stimulus related to volume. However, it does not exclude the possibility that a factor other than extracellular fluid volume expansion contributes to the raised plasma Ir-ANP levels in chronic renal failure.
mesh_terms: D000328:Adult; D001127:Arginine Vasopressin / Q000097:blood; D009320:Atrial Natriuretic Factor / Q000097:blood*; D001769:Blood; D001794:Blood Pressure; D001806:Blood Urea Nitrogen; D001835:Body Weight; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009994:Osmolar Concentration; D011188:Potassium / Q000097:blood; D011863:Radioimmunoassay; D006435:Renal Dialysis; D012964:Sodium / Q000097:blood; D014462:Ultrafiltration
chemical_list: D001127:Arginine Vasopressin; D009320:Atrial Natriuretic Factor; D012964:Sodium; D011188:Potassium