Introduction
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Goal-directed intraoperative fluid therapy reduced the hospital stay after major surgery \[[@B1]\]. Aortic vascular surgery is associated with excessive blood loss and massive fluid shift \[[@B2]\]. We found that postoperative urea and creatinine improved when intravascular fluid volume was maintained using transoesophageal Doppler.

Methods
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We randomly selected 40 patients who underwent elective infrarenal aortic surgery (aortic aneurysm repair/aortobifemoral grafting). All patients\' cardiac output was continuously monitored using a transoesophageal Doppler probe (EDM™; Deltex Medical, Inc., Irving, TX, USA). The corrected flow time (FTc) was recorded immediately after induction as a baseline and recorded again pre-extubation. A target FTc of 375--425 ms was aimed for. The estimated total blood loss was calculated for each patient at the end of surgery. Preoperative and 24-hour postoperative urea and creatinine were recorded for comparison.

Results
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The mean baseline FTc was 278 ms, and the mean target FTc was 405 ms. The mean average blood loss was 3.77 l/patient. The mean preoperative urea and creatinine were 5.9 mmol/l and 95.3 mmol/l, respectively. The mean 24-hour postoperative urea and creatinine were 5.23 mmol/l and 76.77 mmol/l, respectively. See Figure [1](#F1){ref-type="fig"}.

![](cc5472-1){#F1}

Conclusion
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Goal-directed intraoperative fluid therapy aiming for FTc of 375--425 ms as a target improved the 24-hour postoperative urea urea and creatinine in 40 aortic surgical patients in spite of the excessive blood loss.
