1 Procurement of blood samples (arterial puncture) Frequent blood gas determinations (arterial cannulation) Continuous blood pressure monitoring in cardiovascular collapse/shock syndromes/hypertensive emergencies (arterial cannulation) Complications Arterial occlusion by thrombosis/hematoma Infection Ischemia (especially if the ulnar collateral circulation is insufficient) Hematoma—from bleeding problems or inadequate application of manual pressure after completing arterial puncture Caution No medications or hyperosmolar solutions should be administered through peripheral arterial catheters