Community-acquired pneumonia (CAP) is an infection that inflames the air sacs in one or both lungs. It's caused by germs like bacteria or viruses and can affect anyone, but is more serious for the elderly, very young, or those with weakened immune systems. Early diagnosis and treatment are crucial to prevent serious complications.
Community-acquired pneumonia (CAP) is an acute infection of the pulmonary parenchyma acquired outside of healthcare settings. It is a significant cause of morbidity and mortality, with diverse etiologies including bacteria, viruses, and fungi.
| Condition | Distinguishing Feature |
|---|---|
| Acute Bronchitis | Typically viral, characterized by cough without focal consolidation or significant systemic illness. Absence of fever, pleuritic chest pain, and focal lung findings. |
| Pulmonary Embolism | Sudden onset dyspnea and pleuritic chest pain, often without fever or productive cough. Risk factors for VTE are key. |
| Heart Failure Exacerbation | Dyspnea, orthopnea, and bilateral crackles, but typically without fever or purulent sputum. May have peripheral edema. |
| Pneumonitis (non-infectious) | Inflammation of lung tissue from irritants or autoimmune processes, lacking infectious signs like fever or purulent sputum. |
| Lung Abscess | A localized collection of pus in the lung, often presenting with prolonged fever, cough, and foul-smelling sputum. May have a history of aspiration. |
| Tuberculosis | Chronic cough, weight loss, night sweats, and hemoptysis. Often has a more insidious onset and specific radiographic findings. |
Management of CAP involves prompt antibiotic therapy tailored to the likely pathogen and severity of illness, often guided by local resistance patterns and patient factors. Supportive care includes oxygen supplementation, hydration, and antipyretics. Hospitalization is indicated for severe cases, while outpatient management is appropriate for stable patients.