A nurse is caring for a patient who has been receiving continuous intravenous heparin therapy for deep vein thrombosis. The patient's most recent activated partial thromboplastin time (aPTT) is 120 seconds (normal range: 25-35 seconds). The nurse notices the patient has developed new bruising on both arms and reports feeling dizzy when standing up. Which action should the nurse take first?

• 1 Increase the heparin infusion rate according to the protocol
• 2 Continue the current heparin dose and recheck aPTT in 6 hours
• 3 Administer protamine sulfate immediately
• 4 Stop the heparin infusion and notify the healthcare provider ✓ 정답

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