Paper Bag Breathing for Hyperventilation: Does It Work?

Breathing into a paper bag is NOT recommended for hyperventilation.

Mechanism: Rebreathing exhaled CO₂ raises PaCO₂, which can reverse respiratory alkalosis from overbreathing.

Risks

• Hypoxia: Rebreathing lowers O₂; dangerous if underlying cardiopulmonary disease, PE, anemia, or if cause is not anxiety (e.g., metabolic acidosis, sepsis).
• Delay of proper diagnosis: Misses life-threatening causes (MI, PE, DKA, pneumothorax).

Preferred Approach

• Coach slow, diaphragmatic breathing (4-6 breaths/min).
• Reassurance, calm environment.
• Treat underlying cause (anxiety, asthma, metabolic, cardiac).
• Oxygen if hypoxemic.

Paper bag use is outdated and potentially harmful; removed from guidelines (AHA, ERC).