9 favorable factors:
(1) acute urinary retention
(2) moderate to large prostatic indentation on intravenous urography (IVU)
(3) large prostatic adenoma on transrectal sonography of prostate (TRSP)
(4) remarkable intravesicular growth on transrectal sonography of prostate (TRSP)
(5) resected adenoma weight >= 20 grams
(6) constrictive obstructive flow pattern
(7) detrusor instability or hyperreflexia
(8) voiding pressure of >= 50 cm H2O
(9) presence of remarkable prostatic peak pressure on urethral pressure profile
9 unfavorable factors:
(1) chronic urinary retention
(2) irritative bladder symptoms alone
(3) no definite adenoma on transrectal sonography of prostate (TRSP)
(4) resected adenoma of <= 10 grams
(5) maximal flow rate of 10-15 mL/s
(6) maximal flow rate of >= 15 mL/s
(7) intermittent flow pattern
(8) normal flow pattern
(9) detrusor hyporeflexia with a maximal flow rate of > 10 mL/s
Interpretation:
• The presence of 2 or more favorable factors and no unfavorable factors is associated with the best surgical outcomes.
• The presence of more than 2 unfavorable factors indicates the need for careful preoperative evaluation.
• The presence of more than 2 unfavorable factors and no favorable factors indicates that surgery is likely to have a poor outcome.
