title: Clinical Significance of the Resistive Index of Prostatic Blood Flow According to Prostate Size in Benign Prostatic Hyperplasia.
abstract: OBJECTIVE
  The authors evaluated the relationships between the clinical factors and resistive indexes (RIs) of prostate and urethral blood flows by using power Doppler transrectal ultrasonography (PDUS) in men with benign prostatic hyperplasia (BPH).
  
  
  METHODS
  The data of 110 patients with BPH and lower urinary tract symptoms (LUTS) treated between January 2015 and July 2015 were prospectively collected. PDUS was used to identify the capsular and urethral arteries of the prostate in order to measure RIs. International Prostate Symptom Score (IPSS), maximal flow rate (Qmax), total prostate volume (TPV), transition zone volume (TZV), transition zone index (=TZV/TPV), presence of intravesical prostatic protrusion (IPP), and the RIs of capsular and urethral arteries were evaluated for all of the patients by one urologist.
  
  
  RESULTS
  The 110 patients were categorized according to IPSS (mild symptoms, 0-7; moderate symptoms, 8-19; and severe symptoms, 20-35), Qmax (<10 and ≥10 mL/sec), TPV (<30 and ≥30 mL), and presence or absence of IPP. No significant relationship was found between the mean RI of any artery and IPSS or Qmax. The mean RIs of the urethral artery, and left and right capsular arteries were significantly dependent on prostate size and the presence of IPP.
  
  
  CONCLUSIONS
  RI obtained by using PDUS correlated with the presence of IPP and prostate size. The RI of prostate blood flow can be used as a noninvasive diagnostic tool for BPH with LUTS.
authors.affiliation: Department of Urology, Dongguk University College of Medicine, Gyeongju, Korea.
authors.forename: Se Yun
authors.identifier: 0000-0003-1147-8037
authors.initials: SY
authors.lastname: Kwon
authors.affiliation: Department of Urology, Dongguk University College of Medicine, Gyeongju, Korea.
authors.forename: Jung Woo
authors.identifier: 0000-0002-0488-3598
authors.initials: JW
authors.lastname: Ryu
authors.affiliation: Department of Emergency Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
authors.forename: Dai Hai
authors.identifier: 0000-0001-6177-0429
authors.initials: DH
authors.lastname: Choi
authors.affiliation: Department of Urology, Dongguk University College of Medicine, Gyeongju, Korea.
authors.forename: Kyung Seop
authors.identifier: 0000-0002-0554-4272
authors.initials: KS
authors.lastname: Lee
keywords: Prostate; Prostate Hyperplasia; Resistive Index