title: Effects of Silodosin on Lower Urinary Tract Symptoms in Patients with Benign Prostatic Hyperplasia: Evaluation by Frequency/Volume Chart.
abstract: OBJECTIVE
  To prospectively evaluate the efficacy of silodosin, a new α1A -adrenoceptor selective antagonist, for the treatment of lower urinary tract symptoms suggestive of benign prostatic hyperplasia (LUTS/BPH) on the basis of a frequency/volume chart.
  
  
  METHODS
  Forty male patients (71.1 ± 6.6 years old) with LUTS/BPH were treated with silodosin (4 mg twice daily). The effects of the drug were assessed by changes in International Prostate Symptom Score, uroflowmetry, and frequency/volume chart at 1 and 3 months after therapy.
  
  
  RESULTS
  The mean total International Prostate Symptom Score, the mean total storage and voiding scores and the mean quality of life score decreased significantly at 1 and 3 months after therapy (all P < 0.01). Average and maximum flow rates increased significantly, and postvoid residual volume decreased significantly after 1 and 3 months (all P < 0.05). The frequency/volume chart showed that daytime frequency in those who initially voided over eight times/day (n = 12) decreased significantly (P = 0.0391) after 1 month, and nighttime frequency in those who initially voided over two times (n = 16) tended to decrease (P = 0.0833) after 3 months. Mean voided volume in those who initially voided less than 250 mL (n = 31) increased significantly after 1 and 3 months (P = 0.0446 and P = 0.0138, respectively), and maximum voided volume in those who initially voided less than 300 mL (n = 18) tended to increase (P = 0.0833) after 1 month.
  
  
  CONCLUSIONS
  Silodosin appears to be effective for both storage and voiding symptoms by increasing bladder capacity in patients with LUTS/BPH.
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Miho
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Yamanishi
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Mizuno
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Tatsumiya
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Akinori
authors.initials: A
authors.lastname: Masuda
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Mikihiko
authors.initials: M
authors.lastname: Honda
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Tomoyuuki
authors.initials: T
authors.lastname: Uchiyama
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Ryuji
authors.initials: R
authors.lastname: Sakakibara
authors.affiliation: Department of Urology, Dokkyo Medical University, Tochigi, JapanDepartment of Neurology, Chiba University, Chiba, JapanDepartment of Neurology, Toho University Sakura Hospital, Sakura, Japan.
authors.forename: Ken-Ichiro
authors.initials: K
authors.lastname: Yoshida
keywords: alpha blocker; benign prostate hyperplasia; frequency/volume chart; lower urinary tract symptoms; silodosin