Which factor is a major risk factor for aspiration in critically ill patients?

Which factor is a major risk factor for aspiration in critically ill patients?

• A. Gastric residual volume < 150 mL
• B. Decreased level of consciousness
• C. Age
• D. Small diameter feeding tube

Answer: (B)

Decreased level of consciousness is a major risk factor because airway protection relies on intact reflexes like coughing, gagging, and coordinated swallowing. When consciousness is reduced, these reflexes are blunted, making it easier for oropharyngeal contents or enterally delivered feed to enter the airway, especially during feeding, vomiting, or reflux. In critically ill patients, sedation and neurologic impairment further diminish these protective reflexes, raising the likelihood of aspiration. Gastric residual volume being low does not in itself predict aspiration risk and is not a reliable indicator of who will aspirate. Age and the diameter of the feeding tube do not inherently determine aspiration risk—the former is more about comorbidity patterns and the latter about mechanical issues like occlusion rather than airway protection.

Decreased level of consciousness is a major risk factor because airway protection relies on intact reflexes like coughing, gagging, and coordinated swallowing. When consciousness is reduced, these reflexes are blunted, making it easier for oropharyngeal contents or enterally delivered feed to enter the airway, especially during feeding, vomiting, or reflux. In critically ill patients, sedation and neurologic impairment further diminish these protective reflexes, raising the likelihood of aspiration.

Gastric residual volume being low does not in itself predict aspiration risk and is not a reliable indicator of who will aspirate. Age and the diameter of the feeding tube do not inherently determine aspiration risk—the former is more about comorbidity patterns and the latter about mechanical issues like occlusion rather than airway protection.