April 7 Lecture

atelectasis pulls trachea toward collapsed lung
pleural effusion does not

transudate = pressure or oncotic imbalance - sytemic processes - usually bilateral

• increased venous pressure = increased capillary pressure = leading cause of pleural effusion in USA (500,000 per year)
• decreased plasma oncotic pressure = decreased albumin
• leakage of ascites through diaphragm

exudate = inflammation (increased permeability)

• inflammation of lung
• inflammation of pleural space

• parapneumonic effusion - Pneumococcus most common organism.  infected effusion = empyema
• pulmonary edema - exudative effusion near PE, blood tinged
•  

 pleural fibrosis - causes restrictive lung disease