Community-Acquired Pneumonia vs Aspiration Pneumonia and Pneumonitis
Community-Acquired Pneumonia and Aspiration Pneumonia and Pneumonitis are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Community-Acquired Pneumonia vs Aspiration Pneumonia and Pneumonitis at a glance
- Community-Acquired Pneumonia: Lower respiratory tract infection acquired outside of healthcare settings.
- Aspiration Pneumonia and Pneumonitis: Lung injury from inhaled oropharyngeal or gastric contents — chemical vs infectious.
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Side-by-side comparison
| Feature | Community-Acquired Pneumonia | Aspiration Pneumonia and Pneumonitis |
|---|---|---|
| At a glance | Lower respiratory tract infection acquired outside of healthcare settings. | Lung injury from inhaled oropharyngeal or gastric contents — chemical vs infectious. |
| Classic presentation | Lobar consolidation with bronchial breath sounds and egophony classically points to S. pneumoniae; bullous myringitis with patchy infiltrates suggests Mycoplasma.; Cough (productive purulent sputum, or dry), fever, chills, rigors; Pleuritic chest pain, dyspnea; Constitutional: fatigue, myalgia, anorexia; Elderly may present atypically:… | Infiltrate in posterior segment of upper lobe or superior segment of lower lobe (supine aspiration); right side more common (more vertical right main bronchus).; Witnessed aspiration event, choking, or coughing during meals; Cough (may be productive), dyspnea, wheeze; Chemical pneumonitis: acute respiratory distress within minutes-hours… |
| Workup / key labs | CBC (leukocytosis with left shift), BMP, lactate, procalcitonin (helps de-escalate antibiotics); Blood cultures × 2 if severe, ICU admission, immunocompromise, or cavitary disease; Sputum Gram stain and culture if severe or specific pathogen suspected; Urine antigens: S. pneumoniae and Legionella (severe CAP, Legionella outbreak,… | CBC, BMP, lactate, blood cultures (if pneumonia); Sputum Gram stain/culture; anaerobic culture rarely useful given oropharyngeal contamination; Swallow evaluation (video fluoroscopic swallow study or fiberoptic endoscopic evaluation of swallowing) after stabilization, especially post-stroke; Modified barium swallow to characterize… |
| Imaging | Chest radiograph (PA and lateral) — REQUIRED to diagnose pneumonia; lobar consolidation, interstitial infiltrate, or cavitation; CT chest if non-resolving, complicated (abscess, empyema), or unclear; Bedside lung ultrasound — increasingly used in EDs | CXR — infiltrate in gravity-dependent segments; bilateral if large volume; CT chest if abscess, empyema, or non-resolution; identifies cavitation, foreign body; Bronchoscopy if obstructing foreign body suspected |
| First-line treatment | Outpatient, no comorbidities, no recent antibiotics: amoxicillin 1 g TID OR doxycycline 100 mg BID OR macrolide (azithromycin, clarithromycin) if local pneumococcal resistance <25%; Outpatient with comorbidities (heart, lung, liver, renal, diabetes, alcohol, malignancy, asplenia): beta-lactam (amoxicillin-clavulanate 875 mg BID or… | Aspiration pneumonitis (chemical, witnessed, no infection signs): supportive care — supplemental O2, suctioning, observation. Do NOT routinely give antibiotics; many resolve in 24-48 h.; Aspiration pneumonia (community-onset, non-severe): ampicillin-sulbactam 1.5-3 g IV q6h OR amoxicillin-clavulanate 875 mg PO BID; alternative:… |
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