A comparison of different volumes of bupivacaine used in fascia iliaca compartment block introduction.

BACKGROUND: Fascia iliaca compartment block (FICB) is one of the regional techniques applied for post-operative pain control after femoral and knee surgery. To the best of our knowledge, there are limited reports focusing on local anesthetic (LA) volume. Our aim in this study was to find the most clinically effective volume by comparing three different volumes of LA used frequently in the literature for US-guided infra-inguinal FICB for post-operative pain control in patients undergoing femur and knee surgery.

METHODS: A total of 45 patients with ASA I-III physical scores were included in the study. When the surgical procedure was completed under general anesthesia, FIKB was applied with 0.25% Bupivacaine under ultrasound guidance to the patients before extu-bation. Patients were randomly divided into three different groups for the volume of local anesthetic to be administered. Bupivacaine was administered 0.3 mL/kg in Group 1, 0.4 mL/kg in Group 2 and 0.5 mL/kg in Group 3. After FIKB, the patients were extubated. The patients were followed up for 24 h postoperatively in terms of vital signs, pain scores, additional analgesic requirement, and possible side effects.

RESULTS: When the post-operative pain scores were compared, the scores of Group 1 were found to be statistically higher than Group 3 at the post-operative 1st, 4th, and 6th h (p<0.05). When the additional analgesia requirement compared, the post-operative 4th h was highest in Group 1 compared to the other groups (p=0.03). At the post-operative 6th h, additional analgesic requirement was less in Group 3 than in the other groups, and there was no difference between Groups 1 and 2 (p=0.026). As the LA volume increased, the amount of analgesic consumed in the first 24 h decreased, but there was no statistically significant difference (p=0.051).

CONCLUSION: Our study showed that ultrasound-guided FIKB is a safe and effective method for post-operative pain relief as a part of multimodal analgesic components, and 0.25% bupivacaine in 0.5 mL/kg volume provides more effective analgesia than the other two groups without any side effects.