Modified pectoral plane block (PECS II) provides longer analgesia duration and lower morphine use

This meta-analysis evaluated the efficacy of different regional nerve blocks for pain management in patients undergoing modified radical mastectomy for breast cancer. The study included a total population of 790 patients to compare two specific techniques: the modified pectoral plane block (PECS II) and the erector spinae plane block (ESPB). The primary objective was to determine which technique provided superior postoperative analgesia, specifically measuring duration of effect, morphine consumption within the first 24 hours, and patient-reported pain scores.

The intervention group received the PECS II block, while the comparator group received the ESPB. The analysis focused on several key metrics: post-operative analgesia duration, morphine use in the first 24h, and pain scores. Secondary outcomes included the requirement for rescue analgesia and intraoperative fentanyl consumption. These parameters were analyzed to determine if one technique offered a statistically significant advantage over the other in managing surgical pain.

Regarding primary outcomes, the PECS II technique was associated with significantly longer analgesia duration compared to ESPB, with a mean difference (MD) of -3.16 (95% CI -6.11; -0.21, P = 0.0361). Furthermore, patients receiving the PECS II block required significantly less morphine in the first 24 hours post-operation compared to those receiving ESPB, showing a mean difference of 2.96 (95% CI 2.43, 3.48, P < 0.0001). These results suggest that PECS II may provide more sustained relief and lower reliance on systemic opioids in the immediate postoperative period.

In contrast, some outcomes showed no significant difference between the two techniques. Pain scores at 24 hours (measured via NRS or VAS) were comparable between patients receiving PECS II and those receiving ESPB. Similarly, intraoperative fentanyl consumption did not differ significantly between the two groups. These findings suggest that while the duration of effect and systemic opioid requirements varied, the immediate perception of pain intensity at the 24-hour mark was similar across both intervention types.

Secondary outcomes also favored the PECS II technique in specific areas. The study found that PECS II was associated with fewer rescue analgesia requirements compared to ESPB (RR 1.37; 95% CI 1.01, 1.87, P = 0.0437). This indicates a potentially more stable analgesic profile for patients undergoing the procedure using the PECS II block. However, specific data regarding safety and tolerability, including adverse event rates or discontinuation rates, were not reported in the provided data.

When compared to previous landmarks in regional anesthesia for breast cancer surgery, these results suggest that while both ESPB and PECS II are viable options, PECS II may offer modest analgesic advantages. The primary clinical implication is that clinicians might consider PECS II to achieve longer-lasting analgesia and reduced morphine requirements in the first 24 hours post-mastectomy. However, because pain scores at 24 hours were comparable, the choice between techniques may depend on specific institutional protocols regarding opioid sparing versus total duration of effect.\n Several questions remain for future research. The lack of reported safety data makes it difficult to determine if one technique carries a higher risk of local complications. Additionally, while the meta-analysis shows statistical significance in analgesia duration and morphine reduction, the clinical magnitude is described as modest. Further studies are needed to determine if these differences translate into improved patient satisfaction or functional outcomes in the long term.