If an arterial line becomes displaced, what is the first action?

• A. Remove the line and apply a tourniquet
• B. Apply direct pressure to limit blood loss and call for assistance
• C. Leave it in place and monitor quietly
• D. Inject anticoagulant to prevent bleeding

Answer: (B)

Arterial lines carry high-pressure blood flow, so when displaced the immediate danger is uncontrolled arterial bleeding. The first action is to apply direct pressure over the insertion site to limit blood loss and reduce the risk of a hematoma or air entry, while you call for assistance to re-site or secure the line. Removing the line before controlling the bleed can lead to rapid, difficult-to-control bleeding, and simply monitoring or leaving it in place does not address the risk. Giving an anticoagulant would worsen bleeding. After pressure is applied and help arrives, follow the appropriate protocol to reassess and re-establish arterial access safely.