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Post‐surgical hyponatraemia: The role of intravenous fluids and arginine vasopressin

In 14 patients having undergone abdominal surgery, plasma sodium, urine volume and osmolality and the urinary excretion of arginine vasopressin (AVP), the antidiuretic hormone in man, were measured daily for 7 days. Each patient was given 31 of intravenous fluids daily. In 8 patients the fluid was saline and in the other 6 it was dextrose‐saline.