Document Classification

Section Type: METHODS

Text: In this double-blind, randomized, controlled trial, we divided 82 patients (ASA physical status I-III) undergoing unilateral TKA into four groups : (1) a pre-treatment group, in which FNB was performed with 0. 4 mL/kg 0. 375 % bupivacaine plus 1:200, 000 epinephrine after spinal anesthesia but before the operation ; (2) a post-treatment group, in which FNB was performed with the same drugs at similar dosages immediately after the operation ; (3) a pre-control group, in which FNB was performed with normal saline in the same volume as the tested drugs before the operation ; and (4) a post-control group, in which FNB was performed with normal saline in the same volume as the tested drug after the operation.