Abstract: 120 patients with postpartum stress urinary incontinence (PSUI) were selected as the research group, and 120 non-PSUI women in the same period were selected as the control group. Pelvic floor ultrasound and laboratory tests found that the pelvic floor ultrasound parameters in the research group including urethral rotation angle (URA), bladder urethral posterior angle (PUVA), bladder neck mobility (BND) were higher than those of the control group, while serum 25-hydroxyvitamin D[25(OH)D] level was lower than that of the control group (P<0.05). The combined prediction of URA, PUVA, BND and serum 25(OH)D for PSUI was 0.859, and the sensitivity was 77.50%, specificity was 84.17%. The ICI-Q-SF scores of PSUI patients were positively correlated with URA, PUVA, BND and negatively correlated with serum 25(OH)D level (P<0.05). URA, PUVA, BND, and serum 25(OH)D were important factors influencing the occurrence of PSUI (P<0.05). In a word, the pelvic floor ultrasound parameters URA, PUVA, BND and serum 25(OH)D level are closely related to the state of illness, and have high application value in predicting PSUI.

Key words: postpartum stress urinary incontinence, pelvic floor ultrasound, 25-hydroxyvitamin D, prediction, state of illness