D-Displacement – endotracheal tube dislodges from trachea, or falls into right mainstem bronchus

O-Obstruction – Mucous plugging, bronchospasm, patient biting tube

P Pneumothorax – Look out for pneumothorax, it can be subtle

E – Equipment – Disconnected/unpowered equipment, ensure everything is powered on and connected appropriately

S – Stacking – common in asthma/COPD due to inadequate expiration resulting in air trapping between breaths

Further Reading

LITFL – Post-Intubation Hypoxia

CanadiEM – Approach to the Alarming Vent