NCLEX-RN — Registered Nurse Licensure

Physiological integrity

⏱ ~3-min readAceMark Guide

The big idea

What this topic is really about

Clients with COPD often rely on a hypoxic drive to stimulate breathing, so high concentrations of oxygen can override this drive and cause respiratory arrest. Administering low-flow oxygen at 2 to 3 L/min safely supports oxygenation without suppressing their drive to breathe. High-flow systems like a non-rebreather mask (Option C) deliver too much oxygen and are contraindicated in stable COPD management.

Oxygenation and ECG are priority actions for chest pain radiating to the left arm.. Chest pain radiating to the left arm indicates potential myocardial ischemia, requiring immediate oxygenation to protect cardiac tissue and an ECG to diagnose a myocardial infarction.

How it works

See the mechanism

Diagram coming soon

Immediate oxygenation protects cardiac tissue, while an ECG diagnoses potential myocardial infarction. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

Worked example

An exam-style question, fully explained

Priority nursing action for a client with chest pain radiating to the left arm:

Identify what the question tests: Priority nursing action for a client with chest pain radiating to the left arm:.
Chest pain radiating to the left arm indicates potential myocardial ischemia, requiring immediate oxygenation to protect cardiac tissue and an ECG to diagnose a myocardial infarction.
Obtaining a full history first (Option C) inappropriately delays critical, time-sensitive interventions that are necessary to prevent irreversible heart muscle damage.
Why it matters: Immediate oxygenation protects cardiac tissue, while an ECG diagnoses potential myocardial infarction. Delaying these interventions risks irreversible heart muscle damage.

Answer:Apply oxygen and obtain ECG

Common mistakes

Traps the examiner sets

Some nurses may think that rechecking the blood pressure in 15 minutes or documenting and continuing to monitor is sufficient, but this delay can be detrimental to the client's health. Others may believe that administering prescribed antihypertensive medication without consulting the healthcare provider is the priority action, but this may not be the most appropriate course of action in an emergen
Administering aspirin and notifying the physician are secondary actions that should not delay oxygenation and ECG.
Some may confuse platelet count with INR, but INR measures clotting time, not platelet count.
Many people confuse the signs of shock with those of other conditions, such as increased intracranial pressure, which can present with hypertension and bradycardia. Additionally, some may mistakenly believe that fever is a typical sign of shock.
Hypertension and bradycardia are incorrect as they are late signs of increased intracranial pressure rather than typical shock states.

Self-check

Test your recall

Answer each from memory — you'll see instantly whether you're right and why.

Q1.A client has a blood pressure of 180/110 mmHg. The nurse's PRIORITY action is to:

Q2.Priority nursing action for a client with chest pain radiating to the left arm:

Q3.Which lab value indicates the client is at risk for bleeding?

Q4.A client with a potassium level of 2.9 mEq/L is at risk for:

Q5.A client with COPD should receive oxygen at:

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