A nurse is caring for a 45-year-old patient with a history of asthma and obesity who presents with acute chest pain and diaphoresis. Which nursing action should the nurse prioritize first?

The ABCs principle guides priority setting. Oxygen saturation of 88% indicates significant hypoxemia requiring immediate intervention (administer supplemental oxygen). Other options address hyperglycemia or fluid overload but are less urgent.

Core Nursing Explanation Key Concept Analysis: This question tests the application of priority-setting frameworks in a complex, multi-problem patient. The core theme is identifying the Key Point! immediate life-threatening issue using the ABC (Airway, Breathing, Circulation) approach. The patient presents with acute chest pain, diaphoresis, and severe shortness of breath. The most critical data point is the O2 saturation of 88% on room air, indicating severe hypoxemia. Hypoxemia can rapidly lead to tissue damage, cardiac ischemia, and respiratory failure, making it the top priority.

Answer Rationale: The correct answer is to Administer supplemental oxygen. This directly addresses the primary threat to life: inadequate oxygenation. The goal is to rapidly correct hypoxemia, which is a fundamental component of the "B" (Breathing) in the ABCs. Improving oxygenation can also help alleviate chest pain (which may be cardiac or respiratory in origin) and reduce the work of breathing, potentially stabilizing the patient's condition while further assessment is conducted.

Distractor Analysis:
Watch out for confusion! Option ② (Prepare to administer insulin) addresses the significant hyperglycemia (380 mg/dL). While hyperglycemia is a serious concern, especially in a patient with potential metabolic syndrome, it is not the immediate life threat in this acute presentation. Hypoxemia takes precedence over hyperglycemia in the ABC hierarchy.
Watch out for confusion! Option ③ (Administer prescribed diuretic) targets the symptoms of fluid overload (reported weight gain, shortness of breath). However, administering a diuretic to a potentially hypovolemic or unstable patient without ensuring adequate oxygenation and a more complete assessment (e.g., ruling out acute coronary syndrome) could be dangerous. Oxygen is a safer first intervention.
Watch out for confusion! Option ④ (Obtain ABG analysis) is an important assessment action, but it is not an intervention. The nurse's priority is to act on the clear, critical finding of low oxygen saturation. An ABG will provide detailed data but does not treat the hypoxemia. Treat first, then gather more data.

Related Concepts: This scenario integrates concepts of acute coronary syndrome (ACS) (chest pain, diaphoresis), heart failure (HF) exacerbation (weight gain, shortness of breath), and diabetic ketoacidosis (DKA) precursor (hyperglycemia). The nurse must see the forest for the trees: the unifying, immediate threat is hypoxemia.

Concept Summary

Concept	Application in This Case
ABC Priority (Airway, Breathing, Circulation)	Breathing (O2 sat 88%) is the most immediate threat. Oxygen administration is the priority intervention.
Hypoxemia	O2 saturation < 90% is clinically significant. Requires immediate correction to prevent organ damage.
Secondary Assessments	Hyperglycemia, fluid overload, and chest pain etiology are important but addressed after stabilizing oxygenation.
Nursing Process: Assessment vs. Intervention	Prioritize life-saving interventions (giving O2) over diagnostic assessments (drawing ABG) when a critical abnormality is identified.

Side-by-Side Comparison!

Priority Action (This Case)	Why It's Not the First Priority
Administer O2 (ABCs - Breathing)	Directly treats the immediate life threat (hypoxemia). Safe and fast.
Administer Insulin (Hyperglycemia)	Metabolic issue. While urgent, does not trump impaired oxygenation in the ABC hierarchy.
Administer Diuretic (Fluid Overload)	Therapeutic intervention for a suspected problem (HF). Requires more assessment first; could worsen status if given prematurely.
Obtain ABG (Assessment)	Diagnostic, not therapeutic. "Do not delay treatment to get a test."

Anatomy, Physiology & Pharmacology Points

• Physiology: Severe hypoxemia (O2 sat < 90%) impairs oxygen delivery to vital organs, including the heart and brain. The body compensates with tachycardia (HR 110) and tachypnea (RR 28).
• Pathophysiology Link: In a patient with asthma history, obesity, and hyperglycemia, acute hypoxemia could be due to severe asthma exacerbation, pulmonary edema from heart failure, or even a pulmonary embolism complicating the picture.
• Pharmacology: Supplemental oxygen is considered a medication. The nurse must titrate it to achieve a target saturation (usually > 92-94%) and monitor for effectiveness.

Memory Tips

• ABCs are Non-Negotiable: Always ask: Is the Airway open? Is the patient Breathing adequately? Is there Circulation (pulse, perfusion)? Address deficits in this order.
• "Treat First, Test Later": When a critical vital sign abnormality is clear (like O2 sat 88%), intervene immediately. Don't get distracted by ordering more tests.
• Mnemonic: "O2 Before You Do": Oxygen administration comes before other interventions (Insulin, Diuretics) in an acute respiratory distress scenario.

High-Frequency NCLEX Topics The NCLEX-RN loves questions that pit multiple urgent patient needs against each other. Mastering the ABC framework, Maslow's Hierarchy of Needs, and safety/risk reduction principles is essential. This question combines a classic priority-setting scenario with complex pathophysiology (cardiac, respiratory, metabolic).

Watch Out for Question Variations!

• Shift in Data: What if the O2 saturation was 92%? The priority might then shift to the acute chest pain (Circulation - possible MI) or severe hyperglycemia.
• Shift in Focus: "Which assessment should the nurse perform first?" In that case, while oxygen might still be given, the first assessment might be listening to lung sounds or getting a 12-lead ECG.
• Adding a Symptom: If the patient was also unresponsive, the priority would immediately shift to Airway and calling a code/initiating CPR.

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse receiving report on Mr. Johnson, a 45-year-old male with asthma, obesity, and newly discovered hyperglycemia, admitted via the Emergency Department for acute chest pain and shortness of breath. He is anxious, diaphoretic, and struggling to speak in full sentences.

Nursing Intervention Strategy:

1. Immediate Action (Priority 1): Apply a non-rebreather mask (NRB) at 15 L/min to rapidly correct hypoxemia. Continuously monitor pulse oximetry. Your goal is to raise SpO2 above 92%.
2. Simultaneous Assessment & Communication: While applying O2, perform a rapid focused assessment: auscultate lung sounds (crackles? wheezes?), assess heart sounds, and check capillary refill. Inform the charge nurse and physician immediately of the patient's status and your actions.
3. Secondary Interventions (After O2 Initiated):
   • Obtain IV access if not already present.
   • Prepare for and assist with arterial blood gas (ABG) draw to get a definitive acid-base and oxygenation picture.
   • Prepare insulin per protocol for hyperglycemia management, understanding that correction may be slower due to potential stress-induced hyperglycemia.
   • Administer other prescribed medications (e.g., aspirin, nitroglycerin for chest pain, bronchodilators if wheezing) as ordered and once the patient is more stable.
4. Ongoing Monitoring & Evaluation: Reassess vital signs, O2 saturation, breath sounds, and pain level every 5-15 minutes initially. Evaluate the effectiveness of oxygen therapy. Is the SpO2 improving? Is the work of breathing decreasing?

Patient Safety and Precautions:

• Oxygen Safety: Ensure no open flames or sparks near the oxygen source. Humidification may be needed for prolonged high-flow therapy.
• Medication Caution: Do not administer diuretics or nitrates if the patient is hypotensive. Hold insulin if there is any concern for impending hypoglycemia or if the patient's oral intake is nil.
• Fall Risk: A hypoxic, diaphoretic patient is at high risk for falls. Keep the bed in low position, side rails up, and call bell within reach.

Nursing Procedure & Medication Flow Procedure: Administering Oxygen via Non-Rebreather Mask

1. Explain the procedure to the patient briefly: "Mr. Johnson, I'm going to place this mask to help you breathe easier."
2. Select a properly sized mask. Ensure the reservoir bag is inflated by occluding the one-way valve and allowing it to fill with oxygen before placing on the patient.
3. Set the oxygen flowmeter to 15 L/min. Confirm oxygen is flowing by feeling at the ports.
4. Place the mask over the patient's nose and mouth, secure the elastic strap comfortably.
5. Verify the reservoir bag does not completely collapse during inspiration (indicating adequate flow).
6. Document: Time, device, flow rate (L/min), patient's SpO2 before and after, and tolerance.

Medication: Insulin for Hyperglycemia (To be prepared after oxygenation stabilized)

• Check: Verify the order (type of insulin, dose, route). Check the patient's current blood glucose.
• Calculate: Use the prescribed sliding scale or protocol.
• Administer: Subcutaneous injection, typically in the abdomen, thigh, or arm. Rotate sites.
• Monitor: Recheck blood glucose per protocol (e.g., in 1-2 hours). Watch for signs of hypoglycemia (sweating, tremor, confusion).

A Word from Your Senior Nurse "In the chaos of a patient in distress, your brain needs a default setting. Let that setting be ABC. It cuts through the noise. This patient has chest pain, gained weight, and has sky-high blood sugar. But what can kill him in the next few minutes? Not being able to oxygenate his blood. Putting on that oxygen mask isn't just a task; it's you buying time for the team to figure out the rest. In clinicals and on the NCLEX, when you see low SpO2, tachypnea, and distress, think 'Breathing' first. That instinct will save lives and help you ace those tough priority questions."