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Interfascial plane blocks are very common regional anaesthesia techniques used for postoperative analgesia, and they have become highly diversified with the development of ultrasonography technologies and the introduction of this technology into anaesthesia practice. 1 The best known and first described techniques are the transversus abdominis plane (TAP) block and the ilioinguinal-iliohypogastric (II-IH) block. The efficacy of these blocks has been investigated in lower abdominal surgeries, such as caesarean delivery (CD). It has been shown that these blocks decrease pain scores and opioid consumption in the postoperative period in CD. 2,3

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Background Ultrasound guided costotransverse block (CTB) is a relatively new “peri-paravertebral” block that has been described recently. It has been previously reported that CTB, administered with a single high-volume injection, provides effective analgesia in breast conserving surgery. In this study we evaluated the effect of CTB when used in breast cancer surgery. Methods Seventy patients due to undergo breast cancer surgery were included in this blinded, prospective, randomized, efficiency study. Patients were randomized into two equal groups (CTB group and control group) using the closed envelope technique. All patients underwent general anesthesia. In addition to standard analgesia methods, patients in group CTB also received CTB block while the remaining (control group) did not. Numeric rating (pain) scores and opioid consumption was compared between the two groups. Results Opioid consumption in all time frames and pain scores at 1st and 3rd hours only were found to be significantly lower in Group CTB when compared to the control group. Conclusions Ultrasound guided CTB improves analgesia quality in breast cancer surgery. Trial registration Clinicaltrials Registration ID: NCT04197206, Registration Date: 13/12/2019.

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