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Hypersensitivity Pnuemonitis

 
  By : , NJ, USA       10.6.2010         1 Comments          Phone:-          Fax:-          Mail Now
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Hypersensitivity pneumonitis or farmerís lung is an allergic condition where you may be allergic to inhaled dust particles, and cause alveoli or air sacs to become inflamed.The allergen may be mold, bird droppings or fungus spores.The most common type of hypersensitivity pneumonitis is called farmerís lung which is due to exposure to hay, mold and grain.

Causes

Repeated exposure to allergens can cause a reaction that occurs at a cellular level.This is cell-mediated hypersensitivity.Increased white blood cells may be seen in the lung.This can lead to inflammation of small airways and alveoli.This causes difficulty in breathing and hypersensitivity pneumonitis.

Symptoms

Can be acute, sub acute or chronic.

Acute form-

  • Occurs 6-8 hours after exposure.
  • Cough, chills fever, difficulty in breathing, tiredness
  • If exposure stopped, symptoms disappear
  • Symptoms can last 10-12 hours

Sub acute form

  • May occur after acute form, with repeated exposure
  • Cough, sever dyspnea, cyanosis

Chronic form

  • After repeat exposure over prolonged period
  • Chronic cough with phlegm, shortness of breath, loss of appetite, weight loss, cynanosis- can be progressive, leading to oxygen dependence.
  • Increased pulmonary artery pressure, right heart failure, respiratory failure and death

Diagnosis

  • Detailed medical history which includes history of exposure to offending agent, and occupation may provide important clues.
  • Examination can sometimes find wheezing and crackles.
  • Blood work shows increased erythrocyte sedimentation rate, and increased C - reactive protein and rheumatoid factor may be found.
  • Chest x-ray may show patchy infiltrates, in acute form and honey-combing in chronic.Fibrosis may be present
  • Pulmonary function tests- may show restrictive and obstructive patterns, decrease in lung compliance and decreased diffusion capacity
  • Arterial blood gas- shows decreased oxygen
  • Bronchiolar lavage shows increased white blood cells
  • Lung biopsy may be done by bronchoscopy or open biopsy.





Comments

   Chalil, philippines
Reply Posted On :
14 - 9 - 2011

My 4yr.old son had an x-ray and had an interpretation of linear streaks right lower lung fields anteriorly and a remark of pneumonitis,right middle lobe.What does it mean?

 


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