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    Partial lung collapse

    Atelectasis is the collapse of part or (much less commonly) all of a lung.

    See also: Pneumothorax


    Atelectasis is caused by a blockage of the air passages (bronchus or bronchioles) or by pressure on the outside of the lung.

    It is common after surgery, or in patients who were in the hospital.

    Risk factors for developing atelectasis include:

    • Anesthesia
    • Foreign object in the airway (most common in children)
    • Lung diseases
    • Mucus that plugs the airway
    • Pressure on the lung caused by a buildup of fluid between the ribs and the lungs (called a pleural effusion)
    • Prolonged bed rest with few changes in position
    • Shallow breathing (may be caused by painful breathing)
    • Tumors that block an airway


    • Breathing difficulty
    • Chest pain
    • Cough
    • Fever, low-grade, usually after surgery

    Exams and Tests

    • Bronchoscopy
    • Chest CT scan
    • Chest x-ray


    The goal of treatment is to re-expand the collapsed lung tissue. If fluid is putting pressure on the lung, removing the fluid may allow the lung to expand.

    The following are treatments for atelectasis:

    • Clap (percussion) on the chest to loosen mucus plugs in the airway
    • Perform deep breathing exercises (with the help of incentive spirometry devices)
    • Remove or relieve any blockage in the airwaysby bronchoscopy or another procedure.
    • Tilt the person so the head is lower than the chest (called postural drainage). This allows mucus to drain more easily.
    • Treat a tumor or other condition, if there is one
    • Turn the person to lie on the healthy side, allowing the collapsed area of lung to re-expand
    • Use aerosolized respiratory treatments (inhaled medications) to open the airway
    • Use other devices that help increase positive pressure in the airways and clear fluids (positive expiratory pressure [PEP] devices)

    Outlook (Prognosis)

    In an adult, atelectasis in a small area of the lung is usually not life threatening. The rest of the lung can make up for the collapsed area, bringing in enough oxygen for the body to function.

    Large areas of atelectases may be life threatening, especially in a baby or small child, or someone who has another lung disease or illness.

    The collapsed lung usually reinflates slowly if the blockage of the airway has been removed. However, some scarring or damage may remain.

    In general, the outlook depends on the underlying disease. For example,people with extensive cancer have a poor prognosis, while patients with simple atelectasis after elective surgery have good prognosis.

    Possible Complications

    Pneumonia may develop quickly after atelectasis in the affected part of the lung.

    When to Contact a Medical Professional

    Call your health care provider if you develop symptoms of atelectasis.


    • Encourage movement and deep breathing in anyone who is bedridden for long periods.
    • Keep small objects out of the reach of young children.
    • Maintain deep breathing after anesthesia.


    O’Donnell AE. Bronchiectasis, atelectasis, cysts, and localized lung disorders. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 90.


    • Bronchoscopy


    • Lungs


    • Respiratory system


      • Bronchoscopy


      • Lungs


      • Respiratory system


      Tests for Atelectasis

        Review Date: 8/30/2012

        Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

        The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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