Empyema refers to presence of pus in the pleural space -Causes Primary: bacterial Pneumonia (staph aureus, strept pneumonia , H.influenza) , TB
Secondry :
PostTraumati postoperative :open heart , esophageal, mediastinum , lung rupture of lung absess
-pathophysiology and stages During an inflammatory process such as pneumonia, there is an increase in fluid production in the pleural cavity known as the exudate stage. As the disease progresses microorganisms, usually bacteria, can colonize the fluid and generated an empyema. This fluid is characterized by elevated lactate dehydrogenase, proteins, neutrophils, and dead cells. Macroscopically is a thick opaque fluid found in the fibrinopurulent stage. After the resolution of the infection and as a consequence of the inflammation, there is a process of fibrosis that can lead to restriction of the lung parenchyma which is stage of chronic organization