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柴田佳純 1),2), *，大村優華 2) ，山上優紀 3) ，北田裕香 4) ，辻本朋美 2) ，飯田 恵 5) ，井上智子 2)

Aim: This study aimed to clarify the actual condition of urine outflow by the continuous measurement of intravesical urine volume in postoperative patients with indwelling urinary catheter.Methods: This study included patients with temporary indwelling urinary catheters after a urinary, a digestive, or an endocrine surgery. The patients were equipped with an ultrasound bladder scanner, and their intravesical urine volume was measured at 1-min intervals from after the surgery to the next morning. An intravesical urine volume of ≥100 ml was defined as "stagnation of urine outflow."Results: Of the 23 patients, 16 were included in the analysis, and seven patients (43.8%) presented with stagnation of urine outflow. The median (interquartile range) of maximum intravesical urine volume was 78 ml (51, 143), with a range of 34-193 ml. The median (interquartile range) of urinary outflow stagnation time was 24 min (2, 48), with a range of 2-61 min, in seven patients with stagnation of urine outflow. Conclusion:Nearly half (43.8%) of the postoperative patients with indwelling urinary catheter presented with temporary stagnation of urine outflow, and the maximum value of intravesical urine volume during stagnation of urine outflow was 193 ml.