Bronchoaspiration: incidence, consequences and management

Area of Science:

• Pulmonary Medicine
• Anesthesiology
• Critical Care

Background:

• Aspiration involves inhaling oropharyngeal or gastric contents into the lower respiratory tract, triggering inflammatory responses.
• This can lead to serious conditions like infectious pneumonia, chemical pneumonitis, and acute respiratory distress syndrome, associated with high morbidity and mortality.
• The incidence is approximately 3-10 per 10,000 operations, with higher risks in obstetric and pediatric anesthesia, particularly during anesthetic induction and emergence.

Purpose of the Study:

• To define aspiration and outline its pathological mechanisms.
• To discuss the incidence, risk factors, and clinical consequences of aspiration.
• To review current strategies for aspiration prevention and management in anesthesia.

Main Methods:

• Literature review of aspiration pathophysiology, incidence, risk factors, and management strategies.
• Analysis of inflammatory mediators and cellular responses following aspiration.
• Evaluation of anesthetic techniques and pharmacological interventions for prevention.

Main Results:

• Aspiration initiates an inflammatory cascade involving epithelial cells, alveolar macrophages, and neutrophils, leading to alveolocapillary unit degradation.
• Risk is elevated during anesthesia induction/extubation and in specific patient populations.
• Effective prevention includes fasting, pharmacological agents, and rapid sequence induction.

Conclusions:

• Aspiration poses significant risks during anesthesia, necessitating careful management.
• Prevention through fasting and appropriate anesthetic techniques is crucial.
• Treatment should be targeted, with antibiotics for pneumonia and supportive care for lung injury, avoiding unproven therapies like steroids.