Different features of non-invasive parameters in patients with detrusor underactivity compared with normal detrusor contractility

Background：To explore the correlation between non-invasive sonography video urodynamic (SVUDS) parameters, including PV, PVR, Qmax, and BWT, and bladder detrusor contractility. Methods: Clinical data of 448 male patients, who underwent SVUDS from September 2021 to December 2023, were retrospectively collected. The associations between non-invasive SVUDS parameters and WFmax were assessed using Spearman correlation. All patients were divided into two groups according to WFmax, in which WFmax in group A including 99 patients were less than 7W/m2 and was considered DU and WFmax in group B including 349 patients ≥7W/m2 which was considered normal detrusor contractility. The difference of non-invasive SVUDS parameters between DU and normal detrusor contractility was analyzed using one-way ANOVA. Results：There was a negative correlation between WFmax and PVR (r=-0.352, P<0.01), and weak positive correlations between WFmax and Qmax (r=0.218, P<0.01), PV (r=0.123, P <0.01), and BWT (r=0.130, P <0.01) were found. The PVR of patients in group A was significantly higher than that of group B, and PV, Qmax and BWT in group A were significantly lower than those in group B (P<0.01). Conclusion: Higher PVR, lower Qmax, smaller PV, and thinner BWT were significantly associated with DU compared with normal detrusor contractility when the cut-off value of WFmax between DU and normal detrusor contractility was determined at 7W/m2.