Subcutaneously Versus Subfascially Administered Lidocaine in Pain Treatment After Inguinal Herniotomy

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Abstract
We conducted a randomized, prospective, double-blind trial to compare the efficacy of subfascial (SF) versus subcutaneous (SC) lidocaine (10 mL 1%) given in the wound postoperatively through a catheter placed in the respective layer intraoperatively. The initial pain scores were similar in the two groups before injection of lidocaine. In the SC group, there was a reduction in pain scores during rest from 4 to 3 (P > 0.05), during cough from 6 to 5 (P > 0.05), and during mobilization from 7 to 5.5 (P > 0.05) at 15 min. In the SF group, the reductions in pain scores were from 4 to 2 (P < 0.05), from 6 to 3 (P < 0.05), and from 7 to 3 (P < 0.05), respectively. Supplemental analgesics after the lidocaine administration were needed earlier in the SC group than in the SF group (P < 0.01). We conclude that postoperative pain treatment with local lidocaine application after herniotomy has a better effect when applied in the SF, rather than the SC, layer.

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