A nurse is preparing to administer oxygen therapy via nasal cannula to a patient with chronic obstructive pulmonary disease (COPD). Which action should the nurse take first to ensure patient safety?
1Check the patient's baseline oxygen saturation and respiratory status✓ 정답
2Set the oxygen flow rate to 6 L/min as ordered
3Explain the procedure to the patient and family
4Ensure the oxygen delivery equipment is functioning properly
해설
Assessment is the first step of the nursing process. For COPD patients, checking baseline oxygen saturation and respiratory status is critical to avoid suppressing hypoxic drive and ensure safe oxygen therapy initiation.
Core Nursing Explanation
This question tests the application of the nursing process and a critical safety principle in managing patients with Chronic Obstructive Pulmonary Disease (COPD). The core issue is the risk of hypoxic drive suppression when administering oxygen to a patient with chronic hypercapnia (elevated CO2).
Key Concept Analysis: In a healthy person, the primary stimulus to breathe is the level of carbon dioxide (CO2) in the blood (hypercapnic drive). In some patients with long-standing, severe COPD, chronic retention of CO2 blunts this central chemoreceptor response. Their primary respiratory drive shifts to a hypoxic drive, where low oxygen (O2) levels stimulate breathing. Administering high concentrations of oxygen can rapidly correct this hypoxia, removing the stimulus to breathe, leading to Watch out for confusion!hypoventilation, respiratory depression, and a dangerous rise in CO2 (carbon dioxide narcosis). Therefore, oxygen therapy for COPD patients is typically administered at low flow rates (e.g., 1-2 L/min via nasal cannula) and titrated based on patient response.
Answer Rationale: Key Point! Before initiating *any* intervention, the nurse must first assess the patient. Checking the baseline oxygen saturation (SpO2) and respiratory status (rate, depth, effort, lung sounds) provides the essential data needed to:
1. Confirm the need for oxygen.
2. Establish a baseline to evaluate the effectiveness and safety of the therapy.
3. Guide the appropriate titration of oxygen flow rate to achieve a target SpO2 (usually 88-92% for COPD patients), avoiding over-correction.
Distractor Analysis:
② Set the oxygen flow rate to 6 L/min as ordered: This is a potentially dangerous action to take first. A flow rate of 6 L/min via nasal cannula delivers a high FiO2 (Fraction of inspired oxygen) and is generally contraindicated as a starting point for a COPD patient without prior assessment. The nurse must assess first, then intervene based on that assessment and the physician's order, which should specify a range or target SpO2.
③ Explain the procedure to the patient and family: Patient education is a vital part of the Implementation phase but occurs after assessment and planning. You cannot properly educate without first knowing the patient's baseline status.
④ Ensure the oxygen delivery equipment is functioning properly: While this is a crucial safety check, it is part of the planning/preparation step. The nurse's primary responsibility is to the patient's physiological status. Assessing the patient takes precedence over checking equipment.
Related Concepts: This scenario highlights the "A" (Airway/Breathing) of the ABC priority framework. It integrates knowledge of pathophysiology (COPD, hypoxic drive), pharmacology (oxygen as a drug), and the foundational nursing process, where Assessment always comes first.
Concept Summary
Concept
Description
Clinical Implication
Hypoxic Drive
A backup respiratory drive in chronic hypercapnic patients where low PaO2 stimulates breathing.
High-flow O2 can suppress breathing. Use low-flow O2 (1-3 L/min NC).
Target SpO2 in COPD
Goal oxygen saturation for patients with COPD and chronic hypercapnia.
Aim for 88-92%. Avoid >95%.
Nursing Process: Assessment
The systematic collection of data about the patient's health status.
Always the first step. Guides all subsequent actions and ensures safety.
Administer bronchodilators, provide high-flow O2 as needed.
Patient with Severe, Chronic COPD
Key Point!Hypoxic Drive (Low O2)
Titrate low-flow O2 to target SpO2 88-92%.
Assess baseline status FIRST to avoid suppressing drive.
Anatomy, Physiology & Pharmacology Points
Physiology: Central chemoreceptors in the medulla are sensitive to CO2/pH. Peripheral chemoreceptors (carotid/aortic bodies) are sensitive to O2. In chronic hypercapnia, central receptors become desensitized, making the patient reliant on low O2 stimulating the peripheral receptors.
Pharmacology: Oxygen is a medication with a dose (flow rate in L/min) and potential adverse effects (O2 toxicity, absorption atelectasis, and in COPD, respiratory depression).
Memory Tips
COPD O2 Rule: "Less is More" or "Low and Slow." Start low (1-2 L/min) and titrate up slowly to target.
Target SpO2: Remember "88-92, keep them alive." For most other patients, the goal is >94%.
Nursing Process Order: Assess, Diagnose, Plan, Implement, Evaluate. Assessment is always first.
High-Frequency NCLEX Topics
The conflict between following a standard order (like "O2 at 6 L/min") and using nursing judgment based on patient assessment is a classic NCLEX theme. The exam tests your ability to prioritize patient safety over rote task completion. Always think: "What does my patient need right now based on their specific condition?"
Watch Out for Question Variations!
Shift from Action to Evaluation: "The nurse has initiated O2 at 2 L/min via NC for a COPD patient. Which finding indicates the therapy is effective and safe?" (Correct answer: SpO2 is 90% with decreased work of breathing).
Shift to Priority Symptom: "A COPD patient on 2 L/min O2 becomes lethargic and confused. What should the nurse assess first?" (Correct answer: Respiratory rate and depth - suspect CO2 narcosis).
Shift to Equipment: "Which oxygen delivery device is most appropriate for a COPD patient requiring low, precise FiO2?" (Correct answer: Nasal cannula or Venturi mask).
Nursing Clinical Practice GuideClinical Scenario: Mr. Johnson, a 68-year-old with a 40-pack-year smoking history and severe COPD, is admitted with increased dyspnea and productive cough. His arterial blood gas (ABG) on room air shows: pH 7.32, PaCO2 55 mmHg, PaO2 52 mmHg. The physician writes an order: "Oxygen per nasal cannula to keep SpO2 > 90%."
Nursing Intervention Strategy:
1Assessment (First!)Upon entering the room, introduce yourself. Immediately observe his work of breathing (use of accessory muscles, tripod positioning), count his respiratory rate (28 breaths/min), auscultate lung sounds (diminished with wheezes), and apply pulse oximetry (SpO2 86% on room air). This is your baseline.
2Planning & Implementation* Based on the order and your assessment, initiate oxygen at Key Point!1-2 L/min via nasal cannula.
* Re-check SpO2 after 5 minutes. If it's 89%, you've met the goal. If it's 85%, you may cautiously increase to 2 L/min and reassess.
* Continuously monitor for signs of respiratory depression: decreasing respiratory rate, increasing somnolence, or confusion.
* Educate the patient: "Mr. Johnson, this oxygen is to help your breathing. We'll keep it at a low level that's safe for you. Please don't adjust the dial yourself."
3EvaluationThe therapy is effective if his SpO2 is maintained at 90-92% with less dyspnea and a stable or improved mental status.
Patient Safety and Precautions:
* Contraindication: Avoid high-flow oxygen systems (like non-rebreather masks at 15 L/min) unless the patient is in severe, life-threatening hypoxia and close monitoring/intubation readiness is available.
* Key Monitoring: SpO2, respiratory rate and pattern, level of consciousness (LOC), and ABG results if available. A rising PaCO2 with a normalizing PaO2 on an ABG is a red flag for hypoxic drive suppression.
Nursing Procedure & Medication FlowProcedure: Initiating Low-Flow Oxygen via Nasal Cannula for a COPD Patient
1. Perform hand hygiene.
2. Assess patient (vital signs, SpO2, respiratory effort, lung sounds, LOC).
3. Gather equipment: functional oxygen flowmeter, humidifier if needed, nasal cannula, pulse oximeter.
4. Explain the procedure to the patient.
5. Set the flowmeter to the prescribed rate or start at 1 L/min if ordered to titrate to a target SpO2.
6. Place the nasal prongs properly.
7. Reassess the patient within 5-10 minutes and document baseline and response.
A Word from Your Senior Nurse
"Nursing is not just about carrying out physician orders — it's about being the frontline guardian for your patients! In clinical practice, recognizing subtle changes in a patient's vital signs early can prevent deterioration. When studying for your boards, don't just memorize — connect everything to a real patient situation and always ask 'why?' That mindset will not only earn you a great score on the NCLEX but will make you a truly confident, professional nurse! Remember, with COPD and oxygen, you are the gatekeeper. That initial assessment is your most powerful tool to keep your patient safe."
Hypoxic Drive — A secondary respiratory stimulus in chronic hypercapnic patients where low blood oxygen (PaO2) levels, rather than high carbon dioxide (PaCO2), become the primary signal to breathe.
Chronic Obstructive Pulmonary Disease — A progressive lung disease characterized by persistent airflow limitation, often caused by chronic bronchitis and emphysema, leading to dyspnea, cough, and sputum production.
Nasal Cannula — A low-flow oxygen delivery device consisting of two small prongs that fit into the patient's nostrils, delivering oxygen concentrations (FiO2) of approximately 24-44% at flow rates of 1-6 liters per minute.
Carbon Dioxide Narcosis — A condition of CO2 retention leading to central nervous system depression, characterized by drowsiness, confusion, headache, and eventually coma. Can be precipitated in COPD patients by uncontrolled high-flow oxygen therapy suppressing the hypoxic drive.
Nursing Process — A systematic, rational method of planning and providing individualized nursing care, consisting of five sequential steps: Assessment, Diagnosis, Planning, Implementation, and Evaluation (ADPIE).