• Hisato Ito, Toru Mizumoto, Hironori Tempaku, Kazuya Fujinaga, Yasuhiro Sawada, and Hideto Shimpo.
• Cardiothoracic Surgery, Anjo Kosei Hospital, Anjo City, Aichi, Japan. Electronic address: Hisato.ito@gmail.com.
• J. Cardiothorac. Vasc. Anesth. 2016 Dec 1; 30 (6): 1471-1478.

ObjectiveTo investigate the efficacy of the selective vasopressin V2-receptor antagonist tolvaptan in postoperative fluid management after cardiovascular surgery using cardiopulmonary bypass.DesignA retrospective cohort study.SettingA tertiary care center.ParticipantsThe study comprised 99 patients undergoing cardiovascular surgery using cardiopulmonary bypass.InterventionsOral tolvaptan was administered after surgery.Measurements And Main ResultsFifty-one patients treated with tolvaptan were compared with 48 patients treated with intravenous diuretics. Urine volume, the time interval until the patients' body weight returned to the preoperative value, and the length of oxygen dependency after extubation were assessed as surrogate markers for resolution of fluid overload. Urine output on postoperative days 1 and 2 was significantly higher in the tolvaptan-treated patients (29.2 v 20.1 mL/kg/day, p = 0.001; 43.0 v 27.4 mL/kg/day, p<0.001, respectively). Postoperative body weight returned to baseline in 49 tolvaptan-treated patients compared with 33 patients treated with intravenous diuretics (96.1% v 68.8%, p<0.001). Among those with successful body weight reduction, the time interval was shorter in the tolvaptan-treated patients (5 v 7 days, p = 0.006). The length of oxygen dependency after extubation also was shorter in the tolvaptan-treated patients (2 v 3 days, p = 0.006). The urine osmolarity reduction rate before and 4 hours after the first dose of tolvaptan emerged as a significant predictor of its efficacy with a cutoff point of 33.7%, sensitivity of 0.73, and specificity of 0.67 (p = 0.030).ConclusionTolvaptan facilitated early improvement of postoperative fluid overload after cardiovascular surgery.Copyright © 2016 Elsevier Inc. All rights reserved.

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