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PCD – Primary Ciliary Dyskinesia Explained

PCD (Primary Ciliary Dyskinesia) is a rare inherited condition in which the tiny hair-like structures lining the airways do not function properly, leading to chronic respiratory infections.

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Things worth knowing about "PCD"

PCD (Primary Ciliary Dyskinesia) is a rare inherited condition in which the tiny hair-like structures lining the airways do not function properly, leading to chronic respiratory infections.

What is PCD (Primary Ciliary Dyskinesia)?

Primary Ciliary Dyskinesia (abbreviated as PCD) is a rare, genetically inherited disorder in which cilia – microscopic hair-like structures on the surface of mucous membrane cells – are structurally or functionally impaired. Cilia are found primarily in the airways, middle ear, sinuses, and reproductive tract, where they play a critical role in clearing mucus, pathogens, and foreign particles.

PCD affects an estimated 1 in 10,000 to 1 in 20,000 live births. It is inherited in an autosomal recessive pattern, meaning both parents must carry a copy of the altered gene for a child to be affected.

Causes

PCD is caused by mutations in various genes responsible for the assembly and function of cilia. More than 50 disease-causing genes have been identified to date. These genetic changes lead to structural defects within the cilia – for example, in the dynein arm complex, which powers ciliary movement. The result is impaired or completely absent ciliary motility.

Symptoms

The symptoms of PCD are wide-ranging and predominantly affect the respiratory system:

Chronic cough from infancy onwards
Recurrent bronchitis and pneumonia
Chronic sinusitis (inflammation of the paranasal sinuses)
Chronic otitis media (middle ear infections) and hearing loss
Bronchiectasis (permanent widening of the bronchial tubes)
Respiratory distress in newborns

Approximately 50% of PCD patients also have situs inversus – a mirror-image reversal of the internal organs. The combination of PCD, situs inversus, and chronic respiratory infections is known as Kartagener syndrome.

Because cilia are also present in the reproductive tract, male patients with PCD often experience reduced fertility due to immotile sperm. In females, the passage of eggs through the fallopian tubes may be impaired.

Diagnosis

Diagnosing PCD is complex and typically requires a combination of tests:

Nasal nitric oxide (nNO) measurement: PCD patients typically show very low nNO levels. This test is an important screening tool.
High-speed video microscopy (HSVM): Assessment of ciliary beat pattern and frequency.
Electron microscopy: Visualization of ultrastructural defects in the cilia.
Genetic testing: Identification of disease-causing mutations.

Diagnosis should be carried out at a specialized center, as no single test is sufficient on its own.

Treatment

There is currently no cure for PCD. Treatment focuses on relieving symptoms and preventing complications:

Airway clearance physiotherapy: Daily exercises to promote mucus drainage (e.g., breathing techniques, inhalation with saline solution)
Antibiotics: For respiratory infections, sometimes as long-term prophylaxis
Management of ear infections: Including surgical interventions if necessary
Regular monitoring: Lung function tests, imaging, and ENT examinations
Vaccinations: Influenza and pneumococcal vaccines to reduce infection risk

Patients benefit most from multidisciplinary care involving pulmonologists, ENT specialists, physiotherapists, and reproductive medicine specialists where relevant.

References

Zariwala MA, Knowles MR, Leigh MW. Primary Ciliary Dyskinesia. In: Adam MP et al. (eds.). GeneReviews. University of Washington, Seattle; 2007 (updated 2023). Available at: https://www.ncbi.nlm.nih.gov/books/NBK1122/
Lucas JS, Barbato A, Collins SA, et al. European Respiratory Society guidelines for the diagnosis of primary ciliary dyskinesia. Eur Respir J. 2017;49(1):1601090.
Orphanet: Primary Ciliary Dyskinesia. https://www.orpha.net/en/disease/detail/244

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