Abstract
Summary: We studied changes in blood pressure (BP) and plasma hormones (atrial natriuretic peptide [ANP], brain natriuretic peptide [BNP], endothelin [ET], angiotensin [AII] and renin [PRA]) in four stable haemodialysis patients 48 h after a routine dialysis (basal stat), after volume expansion (4–7% above dry bodyweight) for 4 days then 48 h later following ultrafiltration. Blood pressure rose and plasma AII and PRA values fell with volume expansion and returned to baseline at the end of the study. Endothelin values were unchanged. Plasma ANP and BNP rose similarly in three patients and returned to near baseline levels after ultrafiltration. Sustained volume expansion over 4 days in dialysis patients is associated with an increase in BP, a marked elevation in plasma ANP and BNP but without change in ET.
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