Inclusion Criteria:

• * Patient is undergoing scheduled or planned diagnostic or interventional cardiac catheterization with planned general anesthesia requiring endotracheal intubation.

Exclusion Criteria:

• * Patient has a known airway abnormality, including tracheal stenosis, previous tracheal stenosis, or tracheobronchomalacia.
• * Patient has a tracheostomy.
• * Patient is ventilator-dependent.
• * Patient has an anticipated difficult intubation based upon airway exam and/or history of difficult intubation.
• * Patient is unlikely (in opinion of anesthesia team) or is unable to be intubated with 3.5 mm, 4.0 mm, or 4.5 mm Inner Diameter USD-ETT due to the size of the patient or their airway.
• * Patient is already intubated prior to the scheduled procedure.
• * It is anticipated that the patient will not be extubated after the catheterization procedure.
• * Concurrent enrollment in another clinical trial with an intervention during the cardiac catheterization procedure or 30 days afterwards.
• * Allergy to plastic/materials in USD-ETT