Inclusion criteria  Patient: Elective surgical patients requiring non-emergent ultrasound-guided radial arterial catheter placement Providers: Anesthesia providers to include trainees, certified registered nurse anesthetists (CRNA) and attending anesthesia providers.  Exclusion Criteria  Patient Pregnant Patients in a moribund state or palliative care only Vulnerable patients (i.e. Severe mental handicap, non-decisional) History of peripheral arterial disease Placement of arterial catheter without ultrasound guidance Provider: Medical students or CRNA students.