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Sleep and upper airway obstruction in children with achondroplasia
M Zucconi1, G Weber, V Castronovo
1Department of Neurology, State University, Milan, Italy.
Insights
Children with achondroplasia experience significant upper airway obstruction during sleep, characterized by snoring and apnea. Polysomnography is crucial for diagnosing these breathing disorders in achondroplasia.
Area of Science:
- Pediatric pulmonology
- Sleep medicine
- Genetics
Background:
- Achondroplasia, the most common dwarfism, presents with cranial base and midface abnormalities.
- These craniofacial features increase the risk of upper airway obstruction during sleep.
Purpose of the Study:
- Evaluate sleep and respiratory function in children with achondroplasia.
- Differentiate central from obstructive sleep apnea.
- Correlate apneic events with foramen magnum stenosis.
Main Methods:
- Nocturnal polysomnography was performed on 16 children with achondroplasia.
- Brain imaging (CT or MRI) was used for anatomical assessment.
- A comparison group of 25 children with adenotonsillar hypertrophy was included.
Main Results:
- 75% of children with achondroplasia had significant upper airway obstruction during sleep.
- No significant difference in sleep architecture or apnea-hypopnea index between groups.
- Increased breathing rate during sleep observed in achondroplasia group.
- No correlation found between apnea type and foramen magnum stenosis.
Conclusions:
- Upper airway obstruction is the primary breathing disorder during sleep in children with achondroplasia.
- Polysomnography is effective for evaluating sleep-disordered breathing in this population.
Objective:
The features of achondroplasia, the most common form of dwarfism, includes short cranial base and midface hypoplasia; both abnormalities increased the risk of upper airway obstruction during sleep. The aim of our study was to evaluate sleep and respiratory function of children with achondroplasia and to differentiate central from obstructive apnea. We also wanted to correlate apneic events with foramen magnum stenosis.
Study Design:
Sixteen children with achondroplasia (mean age, 4.7 years) were studied by noctumal polysomnography and brain computed tomography or magnetic resonance imaging. A comparison of sleep and respiratory findings was made between the study group and 25 children with adenotonsillar hypertrophy.
Results:
The study revealed no significant difference between groups with respect to sleep architecture. We also found no relationship between apnea type and foramen magnum stenosis. Twelve children (75%) with achondroplasia had significant upper airway obstruction during sleep, with symptoms of continuous snoring and periods of brief obstructive apnea, hypopnea, or both. The mean apneahypopnea index (per hour of sleep) did not differ significantly between the two groups. However, the breathing rate during sleep was increased in children with achondroplasia. These findings indicate that the most important breathing disorder during sleep in children with achondroplasia is upper airway obstruction.
Conclusion:
We conclude that polysomnography with detailed scoring of breathing abnormalities is a useful tool in evaluating sleep-disordered breathing in children with achondroplasia.