Paravertebral Blocks in Implant-Based Breast Reconstruction Do Not Induce Increased Postoperative Blood or Drainage Fluid Loss

<b>Background</b>: Women undergoing a mastectomy often suffer severely from the sequelae of losing one or both breasts. Implant-based breast reconstruction restores female body integrity but can result in significant postoperative pain. The use of paravertebral catheters has been shown to aid significantly in pain management during the postoperative recovery. However, the vasodilation that is induced by paravertebral blocks may lead to prolonged drainage fluid secretion, blood loss and increased likelihood of revision surgery. Therefore, we analyzed the effects of paravertebral blocks after combined mastectomy and immediate breast reconstruction. <b>Methods</b>: We analyzed 115 breast surgeries at the department of Plastic Surgery at the University clinic of St. Poelten between 1 August 2018 and 31 December 2022. Patients were analyzed regarding postoperative hemoglobin loss and drainage fluid volumes and their correlation with paravertebral blocks. Statistical analyses were performed using Levene's Test for Equality of Variances within our cohort. <b>Results</b>: The postoperative hemoglobin loss did not differ significantly between our groups (<i>p</i> = 0.295). Furthermore, a paravertebral block did not increase the amount of postoperative drainage fluid volumes (<i>p</i> = 0.508). Women receiving paravertebral blocks also did not stay longer in hospitals (<i>p</i> = 0.276). No paravertebral block-associated complication was seen. <b>Conclusions</b>: In this study, we demonstrated paravertebral blocks to be safe adjuncts in breast reconstruction to minimize pain without leading to increased blood loss or seroma formation. This indicated that vasodilatation induced by paravertebral blocks did not negatively influence the postoperative recovery. In conclusion, postoperative pain management using paravertebral blocks can be a beneficial therapeutic adjunct in surgical management of breast cancer patients.