title: Influence of bladder contractility on short-term outcomes of high-power potassium-titanyl-phosphate photoselective vaporization of the prostate.
abstract: OBJECTIVE
  To determine the effect of bladder contractility on the outcomes of high-power (80 W) potassium-titanyl-phosphate laser vaporization of the prostate in men with lower urinary tract symptoms.
  
  
  METHODS
  A total of 68 men with a median age of 68.5 years (range 53 to 86) were included in the study. The median follow-up was 9 months (range 6 to 21).
  
  
  RESULTS
  The median International Prostate Symptom Score and quality-of-life index decreased from 18 to 8.5 (P <0.001) and from 4 to 2 (P <0.001), respectively. The median maximal flow rate increased from 10 to 16.1 mL/s (P <0.001) and the median postvoid residual urine volume decreased from 28 to 10 mL (P <0.001). No differences were found in the change in the International Prostate Symptom Score or maximal flow rate according to age, prostate volume, or bladder outlet obstruction index. The weak bladder contractility index (BCI) group (BCI less than 100) had a smaller decrease in the median International Prostate Symptom Score and a smaller increase in the maximal flow rate than did those in the higher BCI group (BCI of 100 or more; P = 0.047 and P = 0.035, respectively). The baseline clinical parameters, including age, prostate volume, serum prostate-specific antigen, and bladder outlet obstruction index, were not significantly different between the low and greater BCI groups.
  
  
  CONCLUSIONS
  The results of the present study have shown that after high-power potassium-titanyl-phosphate laser vaporization, patients with weak bladder contractility had less subjective and objective improvement than did those patients with normal or strong bladder contractility.
authors.affiliation: Department of Urology, Seoul National University Hospital, Seoul, Korea.
authors.forename: Jae-Seung
authors.initials: JS
authors.lastname: Paick
authors.forename: Jin Mo
authors.initials: JM
authors.lastname: Um
authors.forename: Cheol
authors.initials: C
authors.lastname: Kwak
authors.forename: Soo Woong
authors.initials: SW
authors.lastname: Kim
authors.forename: Ja Hyeon
authors.initials: JH
authors.lastname: Ku
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005500:Follow-Up Studies; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D009130:Muscle, Smooth / Q000502:physiology*; D017060:Patient Satisfaction; D010710:Phosphates; D011336:Probability; D011446:Prospective Studies; D011470:Prostatic Hyperplasia / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D018570:Risk Assessment; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D014025:Titanium; D016896:Treatment Outcome; D001743:Urinary Bladder / Q000502:physiology; D016055:Urinary Retention / Q000209:etiology / Q000601:surgery*; D014563:Urodynamics; D014835:Volatilization
chemical_list: D010710:Phosphates; C064806:potassium titanylphosphate; D014025:Titanium