Aspiration

Aspiration occurs when vomit, saliva, blood, or other foreign material enters the airway and reaches the lungs rather than being expelled or swallowed. The body normally prevents this through the gag reflex and the cough reflex — coordinated responses that seal the airway when foreign material approaches it.

Under sufficient CNS depression, these reflexes are suppressed or absent. Alcohol, opioids, benzodiazepines, GHB, and other sedating substances can reduce or eliminate this protection at high doses. A person who vomits while unconscious or deeply sedated may be unable to clear the material, allowing it to reach the lower airways.

Aspiration is a recorded cause of death in cases where the degree of intoxication, on its own, would not have been fatal. The lungs are not tolerant of gastric contents: even a small volume can trigger severe inflammation or obstruction.

How it is done

The primary precaution against aspiration in an unresponsive person is positioning. Placing someone on their side — the recovery position — allows fluid and vomit to drain from the mouth by gravity rather than pooling at the back of the throat, where it can be drawn into the airway.

The head is tilted back slightly and the jaw supported forward to keep the airway open. One arm is extended forward, the top knee bent to stabilize the body on its side. The position is maintained continuously while the person is unconscious, with regular checks that the airway remains clear and breathing continues.

Where a sitter or bystander is present, monitoring is the central task alongside positioning. Breathing rate, color, and responsiveness are observed throughout. Any deterioration is a trigger for emergency services.

When it matters

Aspiration risk becomes active the moment a person loses the ability to respond to their environment — when they cannot be woken, cannot maintain their own head position, or are vomiting without full consciousness. At that point, the airway is no longer self-protected.

Positioning should be established before deterioration progresses, not after. A person who is heavily sedated but still somewhat responsive can become fully unresponsive quickly, particularly with substances that have steep dose-effect curves or that continue accumulating after ingestion.

Emergency contact is warranted when the person cannot be roused, when breathing appears slow or labored, or when the lips or fingertips take on a blue or gray tint. These signs indicate that positioning alone is insufficient to manage the situation.

What it cannot tell you

The recovery position reduces aspiration risk — it does not eliminate it. Vomit can still partially enter the airway even when someone is correctly positioned, particularly if the volume is large or the episode is forceful. Position alone does not ensure the airway remains open; swelling, secretions, or physical obstruction can still compromise it independently.

A person who appears stable in the recovery position may still have inadequate breathing — slow, shallow, or irregular respirations that do not deliver enough oxygen. Positioning addresses where material goes; it says nothing about whether the respiratory system is functioning.

The most common wrong conclusion drawn from a reassuring result is that the situation no longer requires emergency services. Stable positioning buys time; it is not a substitute for professional assessment. The cause of the loss of consciousness is still present and may still be progressing.