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Aspiration pneumonia
Aspiration in an older adult leads to two different pictures: chemical pneumonitis — injury from acidic gastric contents immediately after a witnessed aspiration, which usually does not need immediate antibiotics; and aspiration pneumonia — infection by mouth bacteria in a patient with a swallowing disorder, treated like ordinary pneumonia and without routine anaerobic cover.
Why it matters in the exam
The exam presents an older adult after a stroke or with advanced dementia who coughs while eating and develops fever and an infiltrate at the right lung base, and asks about treatment: antibiotics as for community-acquired pneumonia (for example ampicillin-sulbactam or ceftriaxone), with anaerobic cover added only when there is a lung abscess or empyema. Another situation: a patient who vomited and aspirated during anaesthesia or a seizure — pneumonitis, supportive care, and antibiotics only if there is no improvement within 48 hours.
Recurring points: the location of the infiltrate depends on position — lying down, in the posterior segments of the upper lobes and the superior segments of the lower lobes, and sitting up, in the basal segments, mainly on the right; prevention includes oral hygiene, sitting upright during and after eating, swallowing assessment and texture modification, and fewer sedating drugs; and a feeding tube (PEG) in advanced dementia does not prevent aspiration.
Candidates are also asked about "silent aspiration" — aspiration without coughing, common after stroke and in Parkinson disease, so absence of coughing while eating does not exclude a swallowing disorder. An instrumental study (videofluoroscopic or endoscopic swallowing evaluation) detects it when the bedside assessment is not enough.
Key points
- Pneumonitis — acid, after a witnessed event, supportive care.
- Aspiration pneumonia — mouth bacteria, swallowing disorder, treat as community-acquired pneumonia.
- Anaerobes — only for abscess or empyema.
- Location by position: lying — posterior-upper; sitting — right basal.
- Prevention: oral hygiene, sitting upright, swallowing assessment, fewer sedating drugs.
Summary table
| Issue | Chemical pneumonitis | Aspiration pneumonia |
|---|---|---|
| Mechanism | Acidic gastric contents | Mouth and throat bacteria |
| Who is at risk | Reduced consciousness, anaesthesia, seizure, vomiting | Swallowing disorder, stroke, dementia, poor oral hygiene |
| Course | Respiratory distress within hours of a witnessed event | Gradual, fever and cough |
| Treatment | Supportive; antibiotics if no improvement within 48 hours | As for community-acquired pneumonia; anaerobes — only for abscess or empyema |
| Prevention | Head raised, fasting before anaesthesia | Oral hygiene, sitting upright, swallowing assessment, fewer sedating drugs |
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Sources
- ATS/IDSA guideline — Diagnosis and treatment of adults with community-acquired pneumonia, 2019 — Anaerobic coverage in suspected aspiration
- Mandell LA, Niederman MS — Aspiration pneumonia (review, New England Journal of Medicine), 2019 — Pneumonitis versus pneumonia
- Geriatrics Review Syllabus (American Geriatrics Society), 11th edition (2022) — Pneumonia and dysphagia in older adults
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.