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Introduction and Objective Male detrusor underactivity (DUA) definition remains controversial and no effective treatment is consolidated. Transurethral resection of the prostate (TURP) is one of the cornerstones surgical treatments recommended in bladder outlet obstruction (BOO). However, the role of prostatic surgery in male DUA is not clear. The primary endpoint was the clinical and voiding improvement based on IPSS and the maximum flow rate in uroflowmetry (Qmax) within 12 months. Materials and Methods We analyzed an ongoing prospective database that embraces benign prostata hyperplasia (BPH) male patients with lower urinary tract symptoms who have undergone to TURP. All patients were evaluated pre and postoperatively based on IPSS questionnaires, prostate volume measured by ultrasound, postvoid residual urine volume (PVR), Prostate Specific Antigen measurement and urodynamic study (UDS) before the procedure. After surgery, all patients were evaluated at 1‐, 3‐, 6‐ and 12‐months. Patients were categorized in 3 groups: Group 1—Detrusor Underactive (Bladder Contractility Index (BCI) [BCI] < 100 and BOO index [BOOI] < 40); Group 2—Detrusor Underactive and BOO (BCI < 100 and BOOI ≥ 40); Group 3—BOO (BCI ≥ 100 and BOOI ≥ 0). Results It was included 158 patients underwent monopolar or bipolar TURP since November 2015 to March 2021. According to UDS, patients were categorized in: group 1 (n = 39 patients); group 2 (n = 41 patients); group 3 (n = 77 patients). Preoperative IPSS was similar between groups (group 1—24.9 ± 6.33; group 2—24.8 ± 7.33; group 3—24.5 ± 6.23). Qmax was statistically lower in the group 2 (group 1—5.43 ± 3.69; group 2—3.91 ± 2.08; group 3—6.3 ± 3.18) as well as greater PVR. The 3 groups presented similar outcomes regard to IPSS score during the follow‐up. There was a significant increase in Qmax in the 3 groups. However, group 1 presented the lowest Qmax improvement. Conclusion There were different objective outcomes depending on the degree of DUA at 12 months follow‐up. Patients with DUA had similar IPSS improvement. However, DUA patients had worst Qmax improvement than men with normal bladder contraction.

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