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Lung mechanics and breathing pattern during wakefulness and sleep in children with enlarged tonsils
Insights
Enlarged tonsils in children significantly disrupt breathing during sleep, affecting lung mechanics and gas exchange. This study highlights sleep-related breathing changes in children with tonsillar hypertrophy.
Area of Science:
- Pediatric Pulmonology
- Sleep Medicine
- Respiratory Physiology
Background:
- Enlarged tonsils are a common cause of upper airway obstruction in children.
- Nocturnal symptoms associated with enlarged tonsils can impact respiratory function during sleep.
Purpose of the Study:
- To investigate the effects of sleep on lung mechanics, gas exchange, and breathing patterns in children with enlarged tonsils.
- To compare respiratory parameters during wakefulness and sleep in this pediatric population.
Main Methods:
- Thirteen children with enlarged tonsils underwent polysomnography with induced sleep (chloral hydrate).
- Lung mechanics (resistance, compliance), blood gases (transcutaneous PO2), breathing patterns (tidal volume, inspiratory flow, timing), and airflow were measured during wakefulness and sleep.
Main Results:
- Sleep significantly increased total lung resistance and decreased dynamic lung compliance and transcutaneous PO2.
- During sleep, tidal volume and mean inspiratory flow decreased, while inspiratory time relative to total respiratory cycle duration increased.
- Changes in the timing of peak inspiratory flow were observed, suggesting altered respiratory muscle activity during sleep.
Conclusions:
- Sleep significantly alters lung mechanics, gas exchange, and breathing patterns in children with enlarged tonsils.
- These findings underscore the physiological impact of tonsillar hypertrophy on respiratory control during sleep in children.
Abstract:
Thirteen children (mean age, 45 months) with nocturnal symptoms of upper airway obstruction, the result of enlarged tonsils, were tested during wakefulness (W) and sleep (S) induced by chloral hydrate (less than or equal to 50 mg/kg). During W, lung mechanics, blood gas, breathing pattern, and airflows during tidal breathing were in the normal range. During S, total lung resistance increased significantly, and dynamic lung compliance and transcutaneous PO2 decreased significantly. During S, the tidal volume (VT) and the mean inspiratory flow, normalized for body weight (BW), decreased whereas the ratio of the inspiratory time (TI) over the total duration of the respiratory cycle (TTOT) rose, indicating a longer contraction time of the respiratory muscles. The time to reach peak inspiratory flow, measured as a percentage of TI (dTI/TI), increased in seven children, with no change in the ratio of the expiratory flow over the inspiratory flow, both measured at 50% of VT (EF50/IF50). In three other patients dTI/TI decreased with an increase in EF50/IF50. We conclude that in children with enlarged tonsils, S modified lung mechanics, gas exchange, and the inspiratory components of the breathing pattern and airflow.