An EMT is using a BVM to ventilate a 28-year-old patient with asthma.

In patients with asthma experiencing respiratory failure, improper ventilation (especially excessive rates) can lead to air trapping and increased intrathoracic pressure, reducing venous return and worsening hypotension. The correct technique is to ventilate slowly to allow full exhalation — around 1 breath every 5–6 seconds for adults.

CPAP is contraindicated in unresponsive patients who cannot maintain their own airway. A non-rebreather mask would be insufficient for an unresponsive patient, and forceful ventilation risks barotrauma.