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  • Atelectasis
Page Updated: June 22, 2022

Atelectasis

Anne Courtney Page Medically Reviewed and Edited by Anne Courtney, AOCNP, DNP

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Fact Checked

This page has been fact-checked by a Doctor of nursing practice specializing in Oncology and has experience working with mesothelioma patients.

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Sources of information are listed at the bottom of the article. We make every attempt to keep our information accurate and up-to-date. 

Please Contact Us with any questions or comments.

Atelectasis is a complete or partial collapse of the lung, which can cause serious complications like pneumonia and respiratory failure, although it is treatable.[1] There are many causes of atelectasis, including tumors in the airways and pleural effusion, a complication of mesothelioma.[2] Asbestos may cause a particular type of atelectasis in which the lung tissue folds.[3]

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What is Atelectasis?

Atelectasis occurs when a lung or part of a lung, called a lobe, collapses, inhibiting expansion. The collapse may be partial or complete.

Tiny air sacs inside the lungs, called alveoli, deflate or fill with fluid when this condition occurs. Complete collapse of one lung will cause a person to experience uncomfortable symptoms; however, there may be no signs with smaller areas or if the collapse is incomplete.[1]

Symptoms

Not everyone who has atelectasis will have symptoms. The more severe the blockage or the greater the area of the lung affected, the more likely there is to be noticeable symptoms. Symptoms may include:[4]

  • Trouble breathing and taking deep breaths
  • Shallow, rapid breathing
  • A persistent cough
  • Wheezing
  • Elevated heart rate
  • Cyanosis, a blue tint to the skin caused by decreased oxygen in the blood

Types of Atelectasis

There are several classifications for this condition based on the cause of the collapse and other factors:

  • Obstructive atelectasis occurs when a blockage or obstruction prevents inflation in the lung or part of the lung. This is the most common type of atelectasis.
  • A variety of issues cause nonobstructive atelectasis, but an obstruction does not trigger it.[5]
  • Middle lobe syndrome is a type of atelectasis affecting the middle lobe of the lung. It is either fixed or recurs and is caused by inflammation or defects in the bronchial tissue.
  • Rounded atelectasis occurs when the affected lung tissue folds and adheres to the pleura. This is the type of atelectasis most strongly connected to asbestos exposure. Doctors can easily misdiagnose this type as a tumor.[5]

Causes of Atelectasis

There are many potential causes of atelectasis. If caused by an obstruction, it may be a mucus plug, foreign object, tumor, swollen lymph node, or an aneurysm.

Pleural effusion, a common complication of mesothelioma causing a buildup of fluid between the pleural tissues, can also put pressure on airways causing atelectasis.[1]

Non-obstructive causes of atelectasis include injury to the chest or lungs, pneumonia, and tumors that cause the lung to deflate.

Air leaking into the space between the lungs and the chest wall, called pneumothorax, can also trigger atelectasis. Scarring in the lung tissue, which can result from asbestos exposure, may also cause this condition.[1]

Diagnosing Atelectasis

Diagnosing atelectasis requires a complete physical examination followed by imaging of the chest cavity. The first step is usually an X-ray, which may show the obstruction and any tissue with no air in it. A CT scan is the next stage in a diagnosis, allowing doctors to see soft tissue and the cause of deflation.

The patient may also need a bronchoscopy. A bronchoscopy involves a small camera used to view the inside of the airways.[6]

Atelectasis does not typically require a biopsy; however, in cases where the imaging scans show a mass or growth, a biopsy can determine if it is a cancerous tumor or benign growth.

A biopsy may be especially useful in the case of rounded atelectasis, the type caused by asbestos. The mass created by this condition may look like a tumor, or it may hide tumors indicating the person also has mesothelioma. A biopsy helps refine the diagnosis.[7]

Atelectasis and Asbestos Exposure

Rounded atelectasis is relatively uncommon but is the condition most strongly linked to asbestos exposure. It is estimated that 30% to 86% of diagnosed atelectasis cases are related to asbestos.[3]

Asbestos-related atelectasis occurs when fibrous pleural tissue catches part of the lung tissue, causing it to draw in. This is easy to diagnose due to its characteristic appearance in imaging.

This atelectasis appears as a round mass of pleura with lung tissue radiating from it in imaging scans. Doctors often mistake atelectasis for a tumor despite its distinct appearance on radiographic imaging tests.

The asbestos-related atelectasis doesn’t typically cause symptoms; however, some may experience shortness of breath or dry cough.[8]

It is often stable, meaning it does not worsen with time, but it will progress slowly over time for some patients. Rounded atelectasis is the rarest of the diseases caused by exposure but is often associated with asbestos.

Asbestos exposure can also trigger other conditions that in turn cause atelectasis. For instance, asbestosis is scarring of the lung tissue caused by inhaling asbestos fibers. This hardening of tissue can put pressure on airways causing atelectasis. Pleural effusion, the buildup of fluid in the pleura, can also cause atelectasis and is a common side effect of pleural mesothelioma.[1]

Treating and Managing Atelectasis

Treatment for atelectasis depends on the underlying cause. If there is a tumor or other blockage, procedures to remove it will relieve the condition. Surgery is a common treatment for obstruction removal. Chest therapy may follow surgery to help patients learn deep breathing exercises to re-inflate the lung tissue.[6]

For someone with mesothelioma or pleural effusion triggering atelectasis, treatment may involve surgery, chemotherapy, or radiation to remove or shrink tumors, as well as drain the fluid between the pleura. Surgery is not typically used to treat rounded atelectasis unless it causes significant impairment or severe symptoms.

If you have been exposed to asbestos, you may develop atelectasis but may not have symptoms. Tell your doctor you were exposed to asbestos and consider screening for asbestos-related conditions. Early diagnosis will increase your treatment options and give you a better prognosis.

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Page Medically Reviewed and Edited by Anne Courtney, AOCNP, DNP

Anne Courtney

Anne Courtney has a Doctor of Nursing Practice degree and is an Advanced Oncology Certified Nurse Practitioner. She has years of oncology experience working with patients with malignant mesothelioma, as well as other types of cancer. Dr. Courtney currently works at University of Texas LIVESTRONG Cancer Institutes.

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References
  1. Mayo Clinic. (2018, September 5). Atelectasis. Symptoms and Causes.
    Retrieved from: https://www.mayoclinic.org/diseases-conditions/atelectasis/symptoms-causes/syc-20369684
  2. National Heart, Lung, and Blood Institute. (n.d.). Atelectasis.
    Retrieved from: https://www.nhlbi.nih.gov/health-topics/atelectasis
  3. Agency for Toxic Substances and Disease Registry. (2014, January 29). Asbestos Toxicity. What Respiratory Conditions are Associated with Asbestos?
    Retrieved from: https://www.atsdr.cdc.gov/csem/asbestos/respiratory_conditions_associated_with_asbestos.html
  4. Cleveland Clinic. (2018, January 15). Atelectasis.
    Retrieved from: https://my.clevelandclinic.org/health/diseases/17699-atelectasis
  5. Madappa, T. (2018, December 6). Atelectasis.
    Retrieved from: https://emedicine.medscape.com/article/296468-overview
  6. Mayo Clinic. (2018, September 5). Atelectasis. Diagnosis and Treatment.
    Retrieved from: https://www.mayoclinic.org/diseases-conditions/atelectasis/diagnosis-treatment/drc-20369688
  7. Madappa, T. (2018, December 6). Atelectasis Workup.
    Retrieved from: https://emedicine.medscape.com/article/296468-workup#showall
  8. Emeagwali, N.A., Redlich, C.A., and Dela Cruz, C.S. (n.d.). Asbestos-Related Pulmonary Disorders. Pulmonology Advisor.
    Retrieved from: https://www.pulmonologyadvisor.com/home/decision-support-in-medicine/pulmonary-medicine/asbestos-related-pulmonary-disorders/
View All References

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