Ultrasound-guided superficial serratus plane block for persistent post-mastectomy pain: four case reports.

Background: Persistent post-mastectomy pain (PPMP) is common after surgery. Although multiple modalities have been used to treat this type of pain, including medications, physical therapy, exercise interventions, cognitive-behavioral psychology, psychosocial interventions, and interventional approaches, managing PPMP may be still a challenge for breast cancer survivors. Currently, serratus plane block (SPB) as a novel regional anesthetic technique shows promising results for controlling chronic pain.

Methods: We report four cases of patients with PPMP that were treated using superficial serratus plane block (SSPB) at our clinic. A retrospective review of effect of pain relief was collected through postprocedure interviews.

Results: We found that two of our patients were successfully treated with SSPB for pain after treatment for breast cancer. The third patient had an intercostobrachial nerve block that produced incomplete pain relief but had adequate pain relief with a SSPB. However, the fourth patient reported no pain relief after SSPB.

Conclusion: These cases illustrate that the patients with PPMP could benefit from SSPB. Particularly, we find patients with a subjective sense of "tightness" relating to reconstructive surgeries may be a good candidate for SSPB. Further studies are warranted to evaluate this block for PPMP, as it is low risk and relatively simple to perform.