A nurse is caring for a patient with acute kidney injury (AKI) who has been receiving continuous renal replacement therapy (CRRT) for 48 hours. Which assessment finding would require the most immediate nursing intervention?
1Urine output of 15 mL/hour for the past 4 hours
2Blood pressure of 90/55 mmHg with heart rate of 110 bpm
3Serum potassium level of 5.8 mEq/L
4Air bubbles visible in the CRRT circuit tubing✓ 정답
해설
Air bubbles in the CRRT circuit pose an immediate risk of air embolism, a life-threatening emergency requiring urgent intervention. Other findings (oliguria, hypotension, hyperkalemia) are concerning but manageable with standard monitoring and CRRT therapy.
Clinical Judgment
This question assesses safety priority and clinical urgency. The key is to identify immediate and life-threatening complications that can occur during CRRT (Continuous Renal Replacement Therapy). Since CRRT circulates the patient's blood outside the body, the introduction of air into the circuit can lead to a fatal emergency called Air Embolism. Other options (hypotension, hyperkalemia, decreased urine output) are common problems in AKI (Acute Kidney Injury) patients that require management, but they pose a lower degree of immediate life threat compared to the risk of air embolism. Nurses must recognize the inherent risks of extracorporeal circulation therapy and prioritize monitoring system integrity.
Memory Tip: The top risk in CRRT is Air. Remember the mnemonic: "Air in the line is a Red Alert!"
KR vs US: Both Korea and the US emphasize air embolism prevention as the top safety rule during CRRT. However, the US NCLEX tends to test this systemic safety risk as the situation requiring the most immediate intervention. While important in Korean exams too, the NCLEX specifically tests the ability to stratify the urgency of risks using phrases like 'most immediate'.
Clinical Practice GuideIf you see air bubbles in the CRRT circuit, immediately do the following: 1) Clamp the blood return line (the line close to the patient). 2) Stop the blood pump. 3) Check the patient's condition (difficulty breathing, chest pain, changes in consciousness, etc.). 4) Immediately report to the attending physician or charge nurse (Notify HCP!). Even if it's a small amount of air, if it's moving toward the patient, that itself is an emergency.
Caution: In SATA (Select All That Apply) questions, if "Findings requiring immediate intervention during CRRT" appears, "Air in the circuit" is almost always the correct answer. "Hypotension" or "hyperkalemia" require intervention, but compared to the risk of air embolism, the degree of 'immediacy' may differ, which can be a trap.
Continuous Renal Replacement Therapy — Continuous Renal Replacement Therapy. It is a blood purification treatment that slowly and continuously removes fluid and waste products in patients with acute kidney injury. It is more hemodynamically stable than hemodialysis.
Air Embolism — Air embolism. A life-threatening emergency where air enters the circulatory system and blocks blood vessels. It can occur during CRRT or central venous catheter management, causing breathing difficulty, chest pain, and decreased consciousness.
Acute Kidney Injury — Acute kidney injury. A condition in which kidney function rapidly declines over hours to days, leading to anuria, electrolyte imbalance, and accumulation of waste products.
Oliguria — Anuria. In adults, this is a condition where urine output is less than 0.5 mL/kg per hour (typically less than 400 mL over 24 hours), and it is a major symptom of AKI.
Hyperkalemia — Hyperkalemia. A condition where the serum potassium level rises above normal (3.5-5.0 mEq/L). It can affect the heart muscle, causing arrhythmias and cardiac arrest.