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Primary Ciliary Dyskinesia or PCD is a hereditary condition characterized by defective cilia and flagella function. It causes chronic respiratory infections, infertility, and internal organ misalignment. Primary ciliary dyskinesia (PCD) is a diverse group of disorders characterized by either congenital ciliary absence or ciliary shape and motility abnormalities. Primary Ciliary Dyskinesia (PCD) is caused by a lack of proteins that are necessary for the proper structure and function of the central core (axoneme), ciliary membrane, and matrix, as well as proteins that are necessary for ciliary assembly. In this article, we will look at primary ciliary dyskinesia (PCD), its causes, diagnosis, symptoms, treatment & preventive measures.
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Keyterms: Cilia, Flagella, Chronic respiratory infections, Infertility, Internal organ misalignment, Dyskinesia, Central core (axoneme), Ciliary membrane, Protein
What is Primary Ciliary Dyskinesia (PCD)?
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When a child inherits a gene mutation that stops their cilia from moving properly, it is known as primary ciliary dyskinesia (PCD). Cilia are microscopic hair-like structures found throughout the respiratory tract that sweep mucus from the lungs, ears, and sinuses on a regular basis. Mucus can be coughed up or swallowed after it enters the upper airway.
Primary Ciliary Dyskinesia
The cilia of a person with PCD do not move as they should. Mucus that would typically be washed out of the respiratory system gathers in the airways as a result. Mucus trapped in the lungs, ears, and sinuses carries dirt and germs that can cause recurrent infections of the respiratory tract. PCD is a chronic (long-term) condition that necessitates regular follow-up with a variety of healthcare providers. Most children with PCD, however, enjoy a decent quality of life with therapy and continuous follow-up.
PCD is also known as Acilia syndrome, Dyskinetic cilia syndrome, and Immotile cilia syndrome
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Causes of Primary Ciliary Dyskinesia
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PCD is a hereditary disorder with a recessive inheritance pattern. A child needs to inherit two gene mutations, one from each parent, in order to develop it.
Causes of PCD
Note: PCD affects roughly one out of every 15,000 children in the world. It is more frequent in people of South Asian heritage, with one out of every 2,000 children suffering from it.
Diagnosis of Primary Ciliary Dyskinesia
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PCD symptoms can be mistaken for those of other common childhood disorders. This can often cause a delay in receiving a definitive diagnosis of the problem. If a child has had multiple ears, sinus, or chest infections, it's critical that their doctor obtain a thorough medical history.
- A ciliary biopsy comprises the extraction of a small cilia sample from the lining of the airway or the nose. It then checks for proteins that are required for the movement of cilia using a special microscope. If the proteins are lacking, PCD may be the cause. This test is only available in specialized PCD clinics and is usually the first test conducted for the diagnosis.
- A nasal nitric oxide test for children aged five and up measures the level of a gas called nitric oxide in the air that the child breathes out through their nose. Nitric oxide levels in the nasal passage are extremely low in people with PCD. Only specialized PCD clinics may administer the test.
- A blood test can also detect the PCD-causing gene alterations.
PCD: Diagnosis and Treatment
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Symptoms of PCD
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The following are the most prevalent symptoms of primary ciliary dyskinesia:
- Ear infections and regular hearing loss
- A long-term "wet" cough, with or without mucus since birth or infancy
- Regularly occurring chest infections
- Nasal congestion and chronic nose infections
Treatment
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Although there is no cure for PCD, with proper treatment and continuous follow-up, most children with the disorder can enjoy a good quality of life. The treatment can vary according to the symptoms but mainly comprises:
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Treating the Lungs
Chest physiotherapy: A physiotherapist may teach percussion, positive expiratory pressure (PEP) techniques and an exercise routine for the cleaning of the lungs.
Even with the finest care, PCD can occasionally develop into serious lung illness that necessitates more intensive therapy. A child, for example, may require oxygen treatment at night or during exercise.
If a person has severe PCD (their lungs are failing rapidly), doctors may recommend that they be evaluated for a lung transplant. If a lung transplant is required, it is usually not performed until the middle or late stages of adulthood.
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Treating the Ears and Sinuses
The person with PCD should consult an ENT doctor. The doctor may recommend nasal rinses to clean the nose and sinuses, as well as surgery to clean the sinuses more thoroughly. Some children may require hearing aids to help them hear well. It is critical to correct hearing loss as soon as possible in order to avoid speech and language delays.
Primary Ciliary Dyskinesia
Preventive Measures
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The preventive measures for PCD are as follows:
- Take appropriate infection control procedures, such as frequently washing hands, especially before eating, and avoiding contact with persons who are sick or have a cold.
- Keep your immunizations (shots) up to date, especially the pneumococcal vaccine and the yearly flu vaccine.
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Things to Remember
- PCD, or primary ciliary dyskinesia, is a hereditary condition. The condition is characterized by defective cilia and flagella function. It causes chronic respiratory infections, infertility, and internal organ misalignment.
- Ear infections, wet cough, chest infections, nasal congestions, etc. are the symptoms of PCD.
- PCD is a hereditary disorder with a recessive inheritance pattern.
- A child needs to inherit two gene mutations, one from each parent, in order to develop it.
- The treatment procedure comprises of treatment of lungs, ears, and sinuses.
- A ciliary biopsy comprises the extraction of a small cilia sample from the lining of the airway or the nose.
Sample Questions
Ques. What is Primary Ciliary Dyskinesia? (2 marks)
Ans. PCD, or primary ciliary dyskinesia, is a hereditary condition. The condition is characterized by defective cilia and flagella function. It causes chronic respiratory infections, infertility, and internal organ misalignment.
Ques. What is the treatment for Primary Ciliary Dyskinesia? (5 marks)
Ans. Primary Ciliary Dyskinesia, unfortunately, does not have a permanent treatment. The main focus of treatment is on symptom management. The following is a list of treatments:
- Getting rid of the mucus that has become stuck in the airways.
- Infections in the sinuses, lungs, and ears are treated and controlled.
- To treat some lung infections, clear mucus stuck in the airways, and reduce swelling of the bronchial tubes, a small number of antibiotics, anti-inflammatory, and bronchodilator drugs are recommended.
- Aerobic exercise and other chest physical therapy are standard therapies for lung illnesses and other breathing issues (PCT).
- Patients are given additional treatments and oral medications to clear mucus from the bronchi, which is required for persons with this illness. Answer:
Ques. What are Cilia? (3 marks)
Ans. Cilia refer to the microscopic projections that are in the shape of a finger on the surface of the cell. They are present in the inner lining of the reproductive system, respiratory tract, and other organs. Cilia can also be found in the brain's ventricles and the reproductive system, therefore ciliary malfunction can have an impact on other body systems. Because sperm motility is impaired in affected guys, they are usually sterile. In females, PCD has been linked to infertility and ectopic pregnancy.
Ques. What are the causes of PCD? List out the preventive measures. (3 marks)
Ans. The causes and preventive measures of PCD are:
- Causes:- PCD is a hereditary disorder with a recessive inheritance pattern. A child needs to inherit two gene mutations, one from each parent, in order to develop it.
- Preventive Measures:- Children with PCD should take the following precautions to avoid infection: Take appropriate infection control procedures, such as frequently washing hands, especially before eating, and avoiding contact with persons who are sick or have a cold. Keep your immunizations (shots) up to date, especially the pneumococcal vaccine and the yearly flu vaccine.
Ques. How can PCD be diagnosed. (5 marks)
Ans. PCD symptoms can be mistaken for those of other common childhood disorders. This can often cause a delay in receiving a definitive diagnosis of the problem. The diagnosis can be done in the following ways:
- A ciliary biopsy includes extracting a small sample of cilia from the lining of the nose or airway and checking for proteins that let cilia move normally using a special microscope.
- A nasal nitric oxide test for children aged five and up measures the level of a gas called nitric oxide in the air that your child breathes out through their nose.
- A blood test can detect the PCD-causing gene alterations tests for PCD.
Ques. What are the symptoms of Primary Ciliary Dyskinesia? (3 marks)
Ans. The following are the most prevalent symptoms of primary ciliary dyskinesia:
- Ear infections
- Long-term wet cough
- Regulary occuring chest infections
- Severe nasal congestion
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