ASA American Society of Anesthesiology ASC ambulatory surgery center BMI body mass index EMR electronic medical record LHS learning healthcare system OR operating room PACU post anesthesia care unit PDSA Plan-Do-Study-Act PONV postoperative nausea and vomiting QI quality improvement SCV special cause variation SPC statistical process control US United States 1 Introduction Over the last quarter century, ambulatory surgery has quietly become the dominant model of surgical care in the United...