Transudative vs exudative pleural effusions

Transudate Pleural effusions

Usually due to non infectious etiology.

  1. CHF
  2. Cirrhosis
  3. Pulmonary embolism
  4. Nephrotic syndrome
  5. Peritoneal dialysis
  6. Urinothorax
  7. SVC obstruction
  8. Myxoedema

Transudative effusions

Mostly due to infectious etiology

  1. Neoplasms
  2. Infections
  3. Pulmonary embolism
  4. Collagen vascular diseases
  5. Occupational exposure
  6. Uremia
  7. Meigs syndrome
  8. Sarcoidosis

Lights criteria for exudative pleural effusions

  1. Pleural fluid protien/serum protein>0.5
  2. Pleural fluid LDH/Serum LDH> 0.6
  3. Pleural fluid LDH more than 2/3rds of normal upper limit in serum

Atleast one criteria should be satisfied

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