NCLEX Respiratory Nursing
Respiratory Nursing Overview
Oxygen Devices Nasal cannula (1-6 L), simple mask (6-10 L), non-rebreather (10-15 L, up to 95% FiO2), Venturi mask (precise FiO2)
ABG Normal Values pH 7.35-7.45, PaCO2 35-45, HCO3 22-26, PaO2 80-100
Ventilator Alarms Low pressure (disconnection) → check patient; High pressure (secretions, kinks) → suction, reposition
VAP Prevention Elevate HOB 30-45°, oral care q2h, suction PRN
Respiratory Red Flags Stridor, accessory muscle use, cyanosis, O2 sat <90%, silent chest, sudden confusion
This Blog Includes

NCLEX Respiratory Nursing: Oxygen Therapy & Ventilation

Respiratory nursing is one of the most critical sections on the NCLEX, focusing on oxygen therapy, airway management, ventilation, and ABG interpretation. Because respiratory issues can quickly become life‑threatening, the exam frequently tests your ability to assess, intervene, and apply clinical judgment. This guide covers the essential NCLEX respiratory concepts every nursing student must know.

respiratory nursing

Why Respiratory Nursing Is Important on NCLEX

The respiratory system affects oxygenation, perfusion, acid‑base balance, and overall patient stability. The NCLEX evaluates your ability to:

  • Recognize distress: Rapidly identify signs of respiratory distress such as increased work of breathing, accessory muscle use, cyanosis, or altered mental status.
  • Interpret ABGs: Accurately analyze arterial blood gases (ABGs) to assess oxygenation, ventilation, and acid-base status. Know how to spot hypoxemia, hypercapnia, acidosis, and alkalosis.
  • Use oxygen therapy safely: Select the correct delivery device (nasal cannula, mask, non-rebreather, etc.), set appropriate flow rates, and monitor for complications like oxygen toxicity or CO2 retention (especially in COPD patients).
  • Manage ventilated patients: Monitor mechanical ventilator settings, alarms, and patient response. Prevent complications such as ventilator-associated pneumonia (VAP).
  • Prioritize based on ABCs: Always address Airway, Breathing, and Circulation (ABCs) in correct order when responding to respiratory problems.

Mastering these concepts ensures safe and effective patient care.

Understanding Oxygen Therapy

Common Oxygen Delivery Devices

1 Nasal Cannula (1–6 L/min)
  • Used for mild hypoxia
  • Increases FiO2 by 24–44%
  • Skin breakdown risk around ears and nose
2 Simple Face Mask (6–10 L/min)
  • Moderate oxygen needs
  • Not recommended for COPD patients due to CO2 retention
3 Non‑Rebreather Mask (10–15 L/min)
  • Delivers up to 95% FiO2
  • Used for severe hypoxia, trauma, or shock
  • Bag must remain inflated
4 Venturi Mask
  • Precise oxygen concentration
  • Ideal for COPD and CO2-retaining patients
NCLEX Tip: Never reduce oxygen for a patient in distress, even with COPD.
Device Flow Rate FiO2 Indications
Nasal Cannula 1-6 L/min 24-44% Mild hypoxia
Simple Mask 6-10 L/min 40-60% Moderate hypoxia
Non-Rebreather 10-15 L/min up to 95% Severe hypoxia, trauma
Venturi Mask 4-12 L/min 24-50% precise COPD, precise control

ABG Interpretation (High Yield)

Remember the ROME method:

  • Respiratory Opposite (pH and PaCO2 move opposite directions)
  • Metabolic Equal (pH and HCO3 move same direction)

Normal ABG values:

  • pH: 7.35–7.45
  • PaCO2: 35–45 mmHg
  • HCO3: 22–26 mEq/L
  • PaO2: 80–100 mmHg

Examples:

  • pH ↓, CO2 ↑ → Respiratory acidosis
  • pH ↑, CO2 ↓ → Respiratory alkalosis
  • pH ↓, HCO3 ↓ → Metabolic acidosis
  • pH ↑, HCO3 ↑ → Metabolic alkalosis

NCLEX prioritizes recognizing respiratory failure:

  • PaCO2 > 50
  • PaO2 < 60
  • pH < 7.25
Disorder pH PaCO2 HCO3
Respiratory Acidosis ↓ ↑ Normal (acute) or ↑ (chronic)
Respiratory Alkalosis ↑ ↓ Normal (acute) or ↓ (chronic)
Metabolic Acidosis ↓ Normal or ↓ ↓
Metabolic Alkalosis ↑ Normal or ↑ ↑

Mechanical Ventilation Essentials

1 Low Pressure Alarm

Caused by:

  • Tube disconnection
  • Cuff leak
  • Extubation

Priority: Check the patient first, then reconnect.

2 High Pressure Alarm

Caused by:

  • Secretions
  • Biting the tube
  • Kinks
  • ARDS or bronchospasm

Priority: Suction, reposition, assess breathing.

3 Ventilator-Associated Pneumonia (VAP) Prevention
  • Elevate HOB 30–45°
  • Oral care q2h
  • Suction as needed
  • Monitor for infection

Respiratory Red Flags on NCLEX

Always treat these as emergencies:

  • Stridor (airway obstruction)
  • Accessory muscle use (retractions)
  • Cyanosis
  • O2 sat < 90% on oxygen
  • Silent chest in asthma (ominous sign)
  • Sudden confusion (early hypoxia sign)

Example NCLEX Respiratory Questions

Q1

A patient on a ventilator triggers a high‑pressure alarm. What is the nurse's FIRST action?

✔ Assess for secretions and suction if needed.

Q2

A COPD patient on nasal cannula reports increasing drowsiness. What is the nurse's priority response?

✔ Suspect CO2 retention and assess ABGs.

Q3

ABG results: pH 7.30, PaCO2 50, HCO3 24. What is the interpretation?

✔ Respiratory acidosis (uncompensated).

Respiratory Mastery Checklist

Final Thoughts

Respiratory nursing requires quick thinking, strong assessment skills, and safe interventions. Mastering oxygen therapy, ABG interpretation, and ventilation principles will help you excel in NCLEX respiratory questions and provide life‑saving care in real practice.

key takeaway

Master NCLEX respiratory by knowing oxygen devices (nasal cannula 1-6 L, non-rebreather 10-15 L), ABG interpretation (ROME), ventilator alarms (low=disconnect, high=secretions), and red flags (stridor, silent chest).