To the best of the knowledge of the investigators, the utility of the pectoral nerve block in pedicled Latissimus Dorsi breast reconstruction has not been investigated. A mixed PEC I/ Serratus Plane Block provides analgesia to the lateral and medial pectoral nerves, lateral and anterior branches of the T2-T4 spinal nerves, long thoracic nerve and thoracodorsal nerve, theoretically offering a more comprehensive block than the midaxillary intercostal block and with no additional morbidity to the patient. Furthermore, the intercostal nerve block is a blind technique that may be associated with higher failure rates compared to the more precise, ultrasound guided, PECI/SPB block.