Pleural effusion Chest x-ray of a pleural effusion. The arrow A shows fluid layering in the right pleural cavity. The B arrow shows the width of the lung
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Pleural effusion

Pleural effusion is a medical condition where fluid accumulates in the pleural cavity which surrounds the lungs, making it hard to breathe. more...

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Medicines

Four main types of fluids can accumulate in the pleural space:

  • Serous fluid (hydrothorax)
  • Blood (hemothorax)
  • Lipid (chylothorax)
  • Pus (pyothorax or empyema)

Causes

Pleural effusion can result from reasons such as:

  • Cancer, including lung cancer or breast cancer
  • Infection such as pneumonia or tuberculosis
  • Autoimmune disease such as lupus erythematosus
  • Heart failure
  • Bleeding, often due to chest trauma (hemothorax)
  • Low oncotic pressure of the blood plasma
  • lymphatic obstruction
  • Accidental infusion of fluids

Congestive heart failure, bacterial pneumonia and lung cancer constitute the vast majority of causes in the developed countries, although tuberculosis is a common cause in the developing world.

Diagnosis

In states of excess accumulation, pleural fluid can be sampled and evaluated to determine what disease state may be causing it. This can be sampled through a thoracentesis, where a needle is inserted through the back of the chest wall and into the pleural space. The evaluation consists of:

  1. Gram stain and culture - identifies bacterial infections
  2. Cell count and differential - differentiates exudative from transudative effusions
  3. Cytology - identifies cancer cells, may also identify some infective organisms
  4. Chemical composition including protein, lactate dehydrogenase, amylase, pH and glucose - differentiates exudative from transudative effusions
  5. Other tests as suggested by the clinical situation - lipids, fungal culture, viral culture, specific immunoglobulins

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Pleural effusions: A comprehensive review $8.00 Gale Encyclopedia of Cancer : Pleural effusion $3.10
Pleural effusion caused by trapped lung. (Case Report).(medical research) : An article from: Southern Medical Journal $5.95 Gale Encyclopedia of Alternative Medicine : Pleurisy $5.50
Urinothorax: Unexpected cause of a pleural effusion : An article from: Mayo Clinic Proceedings $20.00 Pleural effusion as presentation of metastatic adenocarcinoma of prostate.(Letters to the Editor) : An article from: Southern Medical Journal $5.95
Valproic acid-induced eosinophilic pleural effusion.(Case Report) : An article from: Southern Medical Journal $5.95 Gale Encyclopedia of Medicine : Thoracentesis $4.70
Reduced hemithoracic uptake on (99m)Tc-MDP bone scintigraphy: An underrecognized sign of massive pleural effusion--A case report : An article from: Journal of Nuclear Medicine Technology $20.00 Massive pleural effusion without bony involvement: an unusual presentation of advanced carcinoma prostate. : An article from: Indian Journal of Cancer $5.95

Pleural effusion
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