What is pulmonary fibrosis?

Pulmonary fibrosis is a chronic and serious medical condition that affects the lungs, characterized by scarring and hardening of the deep tissues surrounding the air sacs (alveoli). This hardening leads to a thickening of the tissue and a loss of elasticity, which makes the process of breathing extremely difficult and reduces the lungs' ability to efficiently transfer oxygen into the blood. Over time, these changes can worsen and lead to a progressive deterioration of lung function.

In many cases, a clear cause for pulmonary fibrosis cannot be identified, and this type is known as idiopathic pulmonary fibrosis (IPF) [2]. Other potential causes include exposure to certain environmental pollutants, the use of certain medications, certain connective tissue diseases, and other interstitial lung diseases that cause inflammation or scarring in the lungs. The risk of developing pulmonary fibrosis increases with age and is higher among smokers or those with a family history of the disease [3].

Symptoms of pulmonary fibrosis

The symptoms of pulmonary fibrosis develop gradually and may not appear in the early stages of the disease. As the condition worsens, the symptoms become more apparent and affect quality of life. Common primary symptoms include [2]:

• Shortness of breath (dyspnea): The most common symptom, which worsens with physical exertion.
• Dry, persistent cough: That does not improve over time.
• Fatigue and exhaustion.
• Unexplained weight loss.
• Muscle and joint pain.
• Clubbing of fingers or toes: A widening and rounding of the tips of the fingers or toes.

It is important to note that pulmonary fibrosis can progress differently from person to person. In some cases, symptoms may remain stable for years, while in others, the condition may deteriorate rapidly. Some individuals may also experience acute exacerbations, where symptoms suddenly and significantly worsen [3].

Diagnosis of pulmonary fibrosis

The diagnosis of pulmonary fibrosis is based on a range of examinations and assessments conducted by a physician. Diagnosis usually begins with a review of the patient's medical history and a comprehensive physical examination. Diagnostic tests and procedures that a doctor may order include:

• Pulmonary function tests: These tests measure how efficiently the lungs take in and expel air, and how well they transfer oxygen into the blood [2].
• Arterial blood gas (ABG) test: This test measures the amount of oxygen and carbon dioxide in the arterial blood, which helps assess how efficiently the lungs perform gas exchange [1]. Normal levels of oxygen saturation (O2Sat) range between 95-100%, the partial pressure of oxygen (PaO2) between 75-100 mmHg, and the partial pressure of carbon dioxide (PaCO2) between 35-45 mmHg [1].
• Imaging tests: Such as chest X-rays and high-resolution computed tomography (CT) scans, which can show signs of scarring in the lungs.
• Lung biopsy: In some cases, a small sample of lung tissue may be needed for examination under a microscope to confirm the diagnosis and rule out other causes.

Treatment options and improving quality of life

There is currently no cure for pulmonary fibrosis, but treatments are available that aim to slow the progression of the disease, alleviate symptoms, and improve the patient's quality of life [2]. These treatments can help improve lung function and may extend the life expectancy of those affected by the disease [3]. Treatment options include:

• Medications: Some drugs can help slow the rate of lung scarring.
• Oxygen therapy: To provide supplemental oxygen to assist with breathing and reduce shortness of breath [2].
• Pulmonary rehabilitation: A comprehensive program that includes exercise, education about the disease, and psychological support to help patients manage their symptoms and improve their ability to perform daily activities.
• Lung transplant: This may be an option for certain eligible patients in advanced stages of the disease.

It is essential to work closely with your healthcare team to develop an individualized treatment plan. The doctor may recommend additional tests if arterial blood gas test results are abnormal, as this test alone does not provide a complete diagnosis [1].

When to seek emergency care?

If you experience sudden, severe shortness of breath, chest pain, bluish discoloration of the lips or nails, or severe confusion, these may be signs of an acute exacerbation of the condition or respiratory failure, both of which require immediate emergency medical care. You must call emergency services or go to the nearest hospital immediately. For more information about pulmonary fibrosis, you can visit Pulmonary Fibrosis: Understanding the Disease, Treatment Options, and Improving Quality of Life (Arabic).

Medical references

• Pulmonary Fibrosis
• Pulmonary Fibrosis What Is Idiopathic Pulmonary Fibrosis?
• Arterial Blood Gas (ABG) Test