Trainees will undergo an hour-long educational session on POC US for SBO involving both lectures and hands on training. Methods for proper consent and data collection will be included. Blinded review of each ultrasound is already planned as a component of the study design and treatment decisions will not be made based on trainees ultrasounds unless supervised by a credentialed faculty member. The five faculty EP sonographers are already fully credentialed in POC ultrasound and familiar with the technique for SBO. No additional ultrasound training will be required for these participants.