Abstract
Abstract Introduction Transversus abdominis plane (TAP) regional anaesthetic blocks are often performed by surgeons and provide effective anaglesia in the immediate postoperative period. It is not known whether the volume and concentration of local anaesthetic used for TAP blocks influences the quality of analgesia when the total drug dose is similar. Aim This pilot aimed to compare low volume versus high-volume TAP block and post-operative pain in patients undergoing elective colorectal surgery, using analgesic consumption as a proxy for pain. Method Single centre cohort study. Data were collected for patients undergoing elective colorectal resections from April – December 2021. Patients were cohorted into those receiving low-volume, high-concentration TAP block (40–50ml 0.25% levobupivacaine) and those receiving high-volume, low-concentration TAP block (100ml 0.125% levobupivacaine). Data including PCA (patient-controlled analgesia) type (morphine/ oxycodone) and post-operative consumption were collected. Results 107 patients undergoing elective colorectal resections were identified. Data regarding TAP block usage was available for 55 patients. 23 (41.8%) patients were given high volume TAP blocks. 78.3% (p=0.56) of patients in the high-volume group were prescribed a PCA postoperatively, compared to 84.3% in the low-volume group. Median morphine PCA consumption was 11mg in the high-volume cohort, compared to 18mg in the low volume cohort (p=0.23). Conclusions High volume TAP block was associated with reduced requirement for a post-operative PCA and a reduced consumption of morphine PCA. Although not statistically significant in our small sample size, our results may be of interest to surgeons and suggest that the use of high-volume TAP blocks warrants further study.
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