Abstract: This paper analyzed the diagnostic value of transrectal three-dimensional ultrasound and strain elastography for bladder outlet patency in elderly patients after prostatectomy. 130 elderly patients with prostate cancer were selected as the research object. According to the postoperative bladder outlet patency, they were divided into control group and study group, with 65 cases in each group. All patients underwent transrectal three-dimensional ultrasound, strain elastography and urodynamic examination. The results showed that the measured values of maximum bladder perfusion volume and maximum urinary flow rate (Qmax) in the study group were lower than those in the control group (P<0.05). The postvoid residual ruine (PVR), maximum detrusor pressure (Pdetmax), ultrasound measured bladder weight (UEBW), maximum elasticity score, arterial resistance index, transitional zone index and inrush index in the study group were higher than those in the control group (P<0.05). Compared with the single diagnosis of transrectal three-dimensional ultrasound and strain force elastography, the combination of the two has a higher diagnostic value for bladder outlet patency in elderly patients with prostate cancer,the area under the curve (AUC) was 0.868 (P<0.05). Transrectal three-dimensional ultrasound and strain elastography have a high value in the diagnosis of bladder outlet patency after prostatectomy in the elderly patients.

Key words: transrectal three-dimensional ultrasound, strain elasticity imaging, prostate cancer, bladder outlet patency