Cystic Fibrosis: Causes, Symptoms, Diagnosis, and Management
Cystic fibrosis is a genetic disorder that primarily affects the lungs, digestive system, and other organs. It is caused by mutations in the CFTR (cystic fibrosis transmembrane conductance regulator) gene, which plays a key role in controlling the movement of salt and water in and out of cells. When this gene does not function properly, it leads to the production of thick, sticky mucus that can block airways and trap bacteria.
One of the most common symptoms of cystic fibrosis is persistent respiratory problems. Individuals may experience chronic coughing, frequent lung infections, wheezing, and shortness of breath. Over time, repeated infections can lead to progressive lung damage. In addition to respiratory issues, cystic fibrosis also affects the digestive system. Thick mucus can block pancreatic ducts, preventing digestive enzymes from reaching the intestines. This results in poor absorption of nutrients, leading to weight loss, poor growth in children, and vitamin deficiencies.
Cystic fibrosis is an inherited condition, meaning a person must receive a defective gene from both parents to develop the disease. If both parents are carriers, there is a 25% chance that their child will be affected. Genetic testing and newborn screening have made early diagnosis more common, allowing for timely intervention.
Diagnosis typically involves a sweat test, which measures the amount of salt in sweat. People with cystic fibrosis usually have higher levels of salt compared to those without the condition. Genetic testing can also confirm the presence of CFTR mutations.
While there is currently no cure, advancements in treatment have significantly improved life expectancy and quality of life. Management includes airway clearance techniques, inhaled medications, antibiotics for infections, and enzyme supplements to aid digestion. Maintaining a high-calorie diet is also important to support growth and energy needs. In recent years, targeted therapies known as CFTR modulators have shown promise in improving the function of the defective protein in some patients.