 The lateral pectoral nerve block is performed as described by Blanco 15. A linear ultrasound probe L28 sonosite, Seattle, WA, USA will be placed in a sagittal paramedian fashion inferior to the lateral third of the ipsilateral clavicle medial to the coracoid. Once the pectoralis major muscle and axillary artery is identified, the thoraco-acromial artery is identified between the pectoralis major and pectoralis minor muscle and confirmed with color Doppler. The lateral pectoral nerve is consistently located adjacent to the artery. 15 Ten mL of study injectate 16 will be delivered using an in-plane technique via a 80 mm echogenic Pajunk, Germany needle adjacent to the artery and into the inter-pectoral plane. Care is taken to avoid intramuscular and intravascular injection. The contents of the injectate will be blinded to any personnel involved in performing the block, general anesthesia, or post operative care. 