Which factor most increases the risk of aspiration pneumonia in an alcoholic with poor dentition?

Which factor most increases the risk of aspiration pneumonia in an alcoholic with poor dentition?

• A. Poor dentition
• B. Immunosuppression
• C. Recent antibiotic use
• D. Vaccination history

Answer: (A)

The key idea is that aspiration pneumonia happens when contents from the oropharynx are inhaled into the lungs, and the specific bacteria you pick up to cause that pneumonia come from the mouth. In an alcoholic with poor dentition, the mouth is colonized by a lot of bacteria, especially anaerobes and oral streptococci. When swallowing is impaired or vomiting occurs, these oral microbes are aspirated and readily cause a pneumonia. So having poor dentition creates the reservoir of pathogens that makes aspiration pneumonia most likely in this setting. Immunosuppression would raise infection risk in general but doesn’t specifically explain why aspiration pneumonia would occur more in this scenario. Recent antibiotic use can shift flora but isn’t the factor that most directly increases the risk of aspiration. Vaccination history can protect against certain pneumonias and wouldn’t increase risk.

The key idea is that aspiration pneumonia happens when contents from the oropharynx are inhaled into the lungs, and the specific bacteria you pick up to cause that pneumonia come from the mouth. In an alcoholic with poor dentition, the mouth is colonized by a lot of bacteria, especially anaerobes and oral streptococci. When swallowing is impaired or vomiting occurs, these oral microbes are aspirated and readily cause a pneumonia. So having poor dentition creates the reservoir of pathogens that makes aspiration pneumonia most likely in this setting.

Immunosuppression would raise infection risk in general but doesn’t specifically explain why aspiration pneumonia would occur more in this scenario. Recent antibiotic use can shift flora but isn’t the factor that most directly increases the risk of aspiration. Vaccination history can protect against certain pneumonias and wouldn’t increase risk.