If a patient on heparin infusion shows an aPTT at the control value despite ongoing infusion, what nursing assessment is most appropriate to perform?

If a patient on heparin infusion shows an aPTT at the control value despite ongoing infusion, what nursing assessment is most appropriate to perform?

• A. Check electrolyte balance
• B. Confirm infusion rate
• C. Assess hydration status
• D. Check the IV site for infiltration

Answer: (D)

When a drug’s expected effect isn’t seen on a monitoring test, the first thing to check is whether the medication is actually being delivered into the bloodstream. For a patient on heparin, the aPTT is used to gauge anticoagulation. If the aPTT remains at the control value despite ongoing infusion, the most likely issue is that the heparin isn’t reaching the circulation because the IV line may be infiltrated. Infiltration means the cannula isn’t intravascular anymore, so the drug leaks into surrounding tissue and doesn’t achieve therapeutic levels in the blood. Therefore, the priority nursing assessment is to inspect the IV site for signs of infiltration: swelling around the insertion, pallor or coolness, tenderness, slowed or stopped infusion, or a damp dressing if leakage occurred. If infiltration is suspected, stop the infusion, remove or reposition the catheter, start a new IV site if needed, ensure patency, and reassess the patient’s anticoagulation plan with follow-up aPTT after adjustments.

When a drug’s expected effect isn’t seen on a monitoring test, the first thing to check is whether the medication is actually being delivered into the bloodstream. For a patient on heparin, the aPTT is used to gauge anticoagulation. If the aPTT remains at the control value despite ongoing infusion, the most likely issue is that the heparin isn’t reaching the circulation because the IV line may be infiltrated. Infiltration means the cannula isn’t intravascular anymore, so the drug leaks into surrounding tissue and doesn’t achieve therapeutic levels in the blood.

Therefore, the priority nursing assessment is to inspect the IV site for signs of infiltration: swelling around the insertion, pallor or coolness, tenderness, slowed or stopped infusion, or a damp dressing if leakage occurred. If infiltration is suspected, stop the infusion, remove or reposition the catheter, start a new IV site if needed, ensure patency, and reassess the patient’s anticoagulation plan with follow-up aPTT after adjustments.