🫁 ARDS and Mechanical Ventilation with PEEP
❓ Question: A patient with Acute Respiratory Distress Syndrome (ARDS) has worsening hypoxemia despite oxygen therapy. Which intervention is most likely required?
✅ Answer: (B) Mechanical ventilation with PEEP
📖 What is ARDS?
ARDS (Acute Respiratory Distress Syndrome) is a life-threatening condition in which the lungs become severely inflamed and the alveoli fill with fluid.
👉 This reduces oxygen exchange, leading to severe hypoxemia (low blood oxygen) that often does not improve with oxygen therapy alone.
📖 What is PEEP?
PEEP stands for Positive End-Expiratory Pressure.
It is a ventilator setting that keeps the alveoli open at the end of expiration, preventing alveolar collapse and improving oxygenation.
Benefits of PEEP include:
- ✔ Improves oxygen exchange
- ✔ Prevents alveolar collapse (atelectasis)
- ✔ Increases functional residual capacity (FRC)
- ✔ Reduces the work of breathing
🩺 Why is Option (B) Correct?
The patient has worsening hypoxemia despite receiving oxygen therapy, indicating severe ARDS.
👉 In this situation, mechanical ventilation with PEEP is often required to maintain adequate oxygenation and support breathing.
❌ Why Other Options Are Wrong?
(A) Oral Steroids
❌ Corticosteroids may be considered in selected ARDS cases, but they do not immediately correct severe hypoxemia and are not the priority intervention.
(C) Incentive Spirometry
❌ Incentive spirometry is useful for preventing postoperative atelectasis in cooperative patients, but it is ineffective in severe ARDS with refractory hypoxemia.
(D) Chest Percussion Only
❌ Chest percussion helps mobilize secretions but does not treat the impaired gas exchange caused by ARDS.
📝 Key Features of ARDS
| Feature | Description |
|---|
| Cause | Diffuse lung inflammation and alveolar damage |
| Main Problem | Severe hypoxemia |
| Chest X-ray | Bilateral diffuse infiltrates (“white-out” appearance) |
| Priority Treatment | Mechanical ventilation with low tidal volume and PEEP |
🧠 Memory Trick:
🫁 ARDS = Alveoli Are Drowning
💨 PEEP = Pops the alveoli open to improve oxygenation.
📌 Exam Tip: In ARDS, if hypoxemia persists despite supplemental oxygen, the next step is usually mechanical ventilation with PEEP. Lung-protective ventilation using low tidal volumes (≈6 mL/kg predicted body weight) is the current standard of care.
💚 Exam Objective Nursing – Asha D
Concept clarity • Easy recall • Nursing success
