RML Pneumonia: Symptoms, Causes & Treatment - A Comprehensive Guide
RML Pneumonia = Right Middle Lobe Pneumonia. Anatomically distinct due to narrow, horizontal bronchus predisposing to mucus plugging and atelectasis.
Etiology
Typical: S. pneumoniae, H. influenzae, M. catarrhalis. Atypical: M. pneumoniae, C. pneumoniae, viruses (flu, RSV, COVID). Aspiration risk due to bronchial anatomy.
Clinical Features
- Fever, cough (productive), pleuritic chest pain (R side), dyspnea.
- RML syndrome: chronic cough, recurrent infections, bronchiectasis from recurrent obstruction.
Diagnosis
- CXR: opacity in RML (silhouettes right heart border).
- CT: better defines anatomy, rules out endobronchial lesion (tumor, FB).
- Sputum/blood cultures, PCR panel, urinary antigens (Legionella, pneumococcal).
Treatment
- Outpatient (mild): Amoxicillin 1g TID or doxycycline × 5–7 days.
- Inpatient (moderate-severe): Ceftriaxone + azithromycin/doxycycline. Adjust for local resistance.
- Supportive: O₂, fluids, antipyretics, chest PT.
Complications
Parapneumonic effusion/empyema, lung abscess, bacteremic sepsis, respiratory failure. RML obstruction can cause chronic atelectasis → bronchiectasis.
Prevention
Pneumococcal vaccines (PCV20, PPSV23), flu/COVID vaccines, smoking cessation, aspiration precautions.
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