A patient is receiving Extracorporeal Membrane Oxygenation (ECMO) with stable machine settings. Suddenly, the patient’s oxygen saturation drops to 85%. What should be the priority nursing action?

Appeared in: NORCET 9 Mains - 2025

Explanation

The nursing process (Assess, Diagnose, Plan, Implement, Evaluate) mandates that assessment is the first step in response to a change in patient status.
A sudden drop in oxygen saturation in an ECMO patient, despite stable settings, is a classic sign of equipment failure, most commonly clot formation in the oxygenator.
Visual inspection of the ECMO circuit for clots is a rapid, non-invasive assessment that can immediately identify a life-threatening mechanical problem.
Identifying a circuit clot allows the team to prepare for an emergency circuit or oxygenator change-out, which is the definitive treatment.

Option A: This is an implementation step that bypasses the critical first step of assessment. It assumes the problem is with the patient's lungs, when it is more likely the ECMO equipment.
Option B: This intervention is completely inadequate for a patient on ECMO. The level of oxygen support from a face mask is negligible compared to what ECMO provides.
Option D: This is a catastrophic and potentially fatal action. ECMO is life support, and discontinuing it abruptly would lead to immediate respiratory and/or cardiac arrest.

Visual 1: Diagram - A labeled diagram of a veno-venous (VV) ECMO circuit, highlighting the oxygenator, pump, and cannulas. This helps learners visualize the path of the blood and identify the key component at risk for clotting.
Visual 2: Image - A side-by-side comparison of a new, healthy ECMO oxygenator (pink/red fibers) and one with significant clot formation (dark, discolored streaks). This provides a clear visual of the problem the nurse is assessing for.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing Priority nursing action for acute complications in a patient on Extracorporeal Membrane Oxygenation (ECMO) in the correct sequence, documenting the action clearly, and monitoring for the expected response.
The nurse at the bedside is the first line of defense in identifying ECMO emergencies. Rapid assessment and communication are critical for patient survival.
Failure to promptly identify and address an oxygenator clot can lead to progressive hypoxemia, organ damage, and death.
What if? - If the nurse assesses the circuit and finds no clots, the next priority would be to assess the patient for other causes of hypoxemia (e.g., patient positioning, pneumothorax, cannula dislodgement, or an acute change in cardiac output) and check blood gases.

How to Approach the Question

First, identify the question type: This is a priority-based clinical scenario question.
Analyze the patient situation: The patient is on advanced life support (ECMO) and has experienced a sudden, critical change (SpO2 drop).
Recall the nursing process: Assessment always comes before implementation (ADPIE). Your first action should be to gather more data.
Evaluate the options based on the nursing process and safety. Which option represents an assessment? Which options are implementations?
Option C is the only assessment. Options A, B, and D are implementations.
Eliminate unsafe or inappropriate actions. Discontinuing ECMO (D) is life-threatening. A face mask (B) is ineffective. Increasing FiO2 (A) without assessment is illogical and ignores the most likely cause (equipment failure).

Concept Tested & Keywords

Concept Tested: Priority nursing action for acute complications in a patient on Extracorporeal Membrane Oxygenation (ECMO).
Stem keywords: Extracorporeal Membrane Oxygenation (ECMO), oxygen saturation drops, priority nursing action
Lead-in keywords: priority
Clinical cues: Sudden drop in SpO2 to 85%
Clinical cues: Stable ECMO machine settings

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Practise the full NORCET 9 Mains - 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.