title: Osmolal excretion after open heart surgery.
abstract: Water and osmolal balance was investigated during the peri-operative period in twenty unselected adult patients presenting for open heart surgery. On the day before surgery the mean urine output was 1.13 litres/sq m/24 hours and osmolal output 430 mOs/sq m/24 hours. Using a haemodilution cardiopulmonary bypass technique, patients received 2.62 litres/sq m and 792 mOs/sq m in the operating room. The pattern of excretion of this water and solute load was identified. Patients were still in positive balance on the day following surgery despite a considerable diuresis, with solute retention exceeding water retention.
mesh_terms: D000328:Adult; D000368:Aged; D002315:Cardiopulmonary Bypass; D001026:Coronary Artery Bypass; D005260:Female; D006349:Heart Valve Diseases / Q000601:surgery*; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D009994:Osmolar Concentration; D011184:Postoperative Period; D011188:Potassium / Q000652:urine; D012964:Sodium / Q000652:urine; D014556:Urine; D014867:Water / Q000378:metabolism; D014882:Water-Electrolyte Balance
chemical_list: D014867:Water; D012964:Sodium; D011188:Potassium