<prompt> Bladder outlet obstruction BOO is defined by:PSA-10 m molUrine flow rate 10 mLsecondUrine voiding pressure decreasedRetained urine  <response>: Ans. b urine flow rate 10mLsecondRef Bailey and Love 27th Edition, Page 1459Bladder outlet obstruction BOO: Its a Urodynamic study based diagnosis. Urine flow rate calculated along with voiding pressures. Urodynamically proven BOO is seen in: BPH Bladder neck stenosis Bladder neck hypertrophy Prostate cancer Urethral strictures Neuropathic conditions Urodynamic study findings: For voided volume 200mL, a peak flow rate of 15mLsecond is normal Voiding pressures 60cmH2 O is normal So, Flow rate 10mLs or Pressure more than 80cmH2 O is definition of BOO Complications of BOO: Acute and chronic retention of urine 