Novel local anesthesia technique 'NATURE ' (Nerves And Transversalis-fascia Using RopivacainE) to improve outcomes during endo-laparoscopic inguinal hernia repair.

Background: The use of local anaesthesia infiltration techniques may attenuate pain following endo-laparoscopic inguinal hernia surgery. We aim to reduce post-operative pain and the subsequent need for analgesia using a novel technique of local anaesthesia infiltration 'NATURE' (Nerves And Transversalis-fascia Using RopivacainE).

Methods: This is a retrospective study of patients who underwent endo-laparoscopic inguinal hernia repair in two institutions in Singapore. Patients who received the local anaesthesia according to the new technique (intervention group) were compared to patients who received local anaesthesia only over their surgical incisions (control group).

Results: Data on 97 patients were analysed. There were 50 (51.5%) patients in the intervention group and 47 (48.5%) patients in the control group. No significant differences were observed in the two patient population's baseline characteristics, operative time and cumulative need for medications. The intervention group reported lower pain levels immediately after surgery (1.4 ± 1.7 versus 2.4 ± 1.9, p<0.01) and at 4 hours post-surgery (0.9 ± 1.1 versus 1.4 ± 1.2, p = 0.02). They also had lower levels of post-operative complications (4% versus 21.3%, p = 0.03).

Conclusion: Infiltration of local anaesthesia at specific anatomical locations during endo-laparoscopic inguinal hernia surgery can be effective in minimising post-operative pain. Prospective randomised controlled trials are needed to further substantiate this technique.