RecruitingProcedureUltrasound Guided Serratus Anterior Plane Block for Rib FracturesThis study is a single center, randomized controlled trial examining the effect of serratus anterior plane block (SAPB) on pain, PIC scores and other clinical outcomes in emergency department patients with multiple rib fractures in comparison to the use of analgesic medication alone. Objectives 1. Compare SAPB performed in the ED setting to analgesic medication alone with regard to pain, respiratory status and PIC score of patients with multiple rib fractures. 2. Assess the safety and feasibility of performing ultrasound-guided SAPB in the ED. 3. Evaluate outcomes of patients receiving the SAPB in the ED including amount of analgesic medications used, level of care required, need for upgrading level of care, and length of stay.