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Pathogenesis : empyema phases

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<strong>Pathogenesis</strong> : <strong>empyema</strong> <strong>phases</strong>• Exudative phase:clear, straw-colored effusion(pH>7.3, glucose 60 mg%, LDH < 500 U/L )• Fibrinopurulent phase:effusion contains large numbers of bacteria and WBC,deposition of fibrin on both the visceral and parietal pleura( pH < 7.2 , glucose < 40mg%, LDH > 1000 U/L)• Organizing <strong>empyema</strong> phase : an <strong>empyema</strong> capsule containspus.Clinics Chest Med 2010;20:607-622

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