Primary ciliary dyskinesia and Kartagener's syndrome
Kartagener's Syndrome 🫁🔄:
A rare autosomal recessive disorder and subset of Primary Ciliary Dyskinesia (PCD), caused by defective dynein arms in cilia.
Classic triad = Situs inversus 🔄 + Chronic sinusitis 🤧 + Bronchiectasis 🫁.
Results from impaired mucociliary clearance → recurrent infections + infertility issues.
About ℹ️
- Inheritance: Autosomal recessive 👪.
- Pathophysiology: Defective cilia → impaired mucociliary clearance → recurrent respiratory infections.
- Key components:
- Primary Ciliary Dyskinesia (PCD).
- Situs inversus (~50% of cases) 🔄.
- Chronic sinusitis 🤧.
- Bronchiectasis 🫁.
- Dynein arm defect confirmed on EM.
Aetiology 🧬
- Defective ciliary motion due to dynein arm mutation (e.g., DNAI1, DNAH5 genes).
- Impaired mucociliary clearance → chronic airway infection, middle ear disease, infertility.
Clinical Features 👀
- Chronic productive cough + sputum.
- Nasal congestion, recurrent sinusitis 🤧.
- Situs inversus totalis (~50%) 🔄.
- Bronchiectasis with recurrent chest infections 🫁.
- Recurrent otitis media → hearing loss 👂.
- Male infertility (immotile sperm) 🚹; reduced fertility in females (fallopian tube dysfunction) 🚺.
- Neonatal respiratory distress 🍼.
Differentials 🔍
- Bronchiectasis (post-infective, idiopathic).
- Cystic fibrosis (check sweat chloride).
- Primary immunodeficiencies (IgG, IgA deficiency).
Associated Conditions 🤝
- Recurrent otitis media and hearing loss.
- Chronic rhinosinusitis.
- Autoimmune disorders (e.g., IBD, RA) reported associations.
Investigations 🧪
| Investigation | Description | Comments |
|---|
| Bloods 🧬 | FBC, U&E, CRP. | Look for infection. |
| CXR/Imaging 📸 | Lung changes, situs inversus. | Useful in flare-ups. |
| Nasal Nitric Oxide | Low levels in PCD. | Screening test. |
| Ciliary Function Testing | Assesses beat frequency/motion. | Gold standard. |
| Immunoglobulins | IgG, IgA etc. | Rule out immunodeficiency. |
| Genetic Testing | DNAI1, DNAH5 mutations. | Confirms diagnosis. |
| HRCT Chest | Bronchiectasis pattern. | Staging severity. |
| Electron Microscopy 🔬 | Dynein arm defects. | Diagnostic confirmation. |
Management 💊
- Infections: Prompt antibiotics; consider prophylactic courses.
- Airway clearance: Chest physio, postural drainage, mucolytics.
- Medications:
- Bronchodilators for obstruction.
- Inhaled steroids for inflammation.
- Oxygen in advanced disease.
- Monitoring: Regular lung function, HRCT, ENT/hearing checks 👂.
- Fertility counselling: IVF/ICSI may help affected males.
- Genetic counselling: Essential for families.
- Specialist referral: Respiratory & ENT teams for coordinated care.
References 📚
💡 Clinical Pearls
- Triad = Situs inversus 🔄 + Sinusitis 🤧 + Bronchiectasis 🫁.
- Low nasal nitric oxide is a useful screening marker for PCD.
- Consider in neonates with unexplained respiratory distress + situs inversus.
- Unlike CF, sweat chloride is normal in PCD/Kartagener’s.
