Injury to the vessel, bleeding, hematoma, pseudoaneurysm, and clot or occlusion of the vessel causing a loss of the distal pulse should be monitored frequently while the catheter or sheath is in place and post procedure until the coagulation times are within normal ranges. The pulse can still be assessed just above the insertion site, and the distal pulses should be assessed prior to the cannulation and at routine intervals post-procedure. Most suggest assessing every 15 minutes for the first 1 to 2 hours after removal, then every hour until the patient is ambulatory and/or is discharged. The American Association of Critical-Care Nurses (AACN) procedure manual is an excellent reference on the removal and monitoring of the arterial catheter.