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Sleep apnoea in acute bronchiolitis
Insights
Acute bronchiolitis in infants significantly alters sleep respiration patterns, particularly during quiet sleep. Apnea index and attack rates increase, while oxygen levels decrease, highlighting respiratory changes during illness.
Area of Science:
- Pediatric Pulmonology
- Sleep Medicine
- Neonatal Research
Background:
- Acute bronchiolitis is a common respiratory infection in infants.
- Sleep disturbances are frequently observed during acute respiratory illnesses in infants.
Purpose of the Study:
- To investigate the impact of acute bronchiolitis on infant sleep polygraphy.
- To analyze changes in respiratory patterns, including sleep states and apnoeic events, during and after bronchiolitis recovery.
Main Methods:
- Polygraphic sleep studies were conducted on 16 infants (1-6 months old) during acute bronchiolitis and after recovery.
- Key parameters monitored included total sleep time, active/quiet sleep percentages, respiration rate, apnoeic pauses, heart rate, and transcutaneous oxygen tension.
Main Results:
- During bronchiolitis, active sleep decreased slightly (35% vs. 31% post-recovery).
- Respiration rate increased, and apnoeic episodes showed increased index and attack rates specifically in quiet sleep.
- Transcutaneous oxygen tension was significantly reduced during infection, with no difference between sleep states.
Conclusions:
- Acute bronchiolitis primarily affects respiratory patterns during quiet sleep in infants.
- Increased apnoeic activity and reduced oxygenation during quiet sleep are significant findings.
- These respiratory changes during sleep warrant attention in managing infants with bronchiolitis.
Abstract:
Three- to 4-hour polygraphic sleep studies were carried out in 16 infants aged between 1 and 6 months during and after recovery from acute bronchiolitis. During bronchiolitis 35% of total sleep time was active sleep compared with 31% after recovery. Respiration rate was increased during bronchiolitis and was higher in active sleep and quiet sleep irrespective of the stage of the illness. Apnoeic pauses were invariably shorter than 15 seconds, the mean duration for active sleep and quiet sleep being similar during infection and after recovery. Apnoeic episodes were central in type and generally initiated by a sign or body movements. Preapnoea heart rate was significantly higher than during or after apnoea. Apnoea index (the percentage of time the baby spends apnoeic), apnoea attack rate (the number of episodes of apnoea per unit time), and apnoea percentage (the distribution of episodes of apnoea while in a given sleep state) were increased significantly in quiet sleep during the index illness. Transcutaneous oxygen tension was significantly reduced during the course of infection, but comparable values were obtained in active sleep and quiet sleep during initial and recovery periods. These results show that the main changes in respiration pattern during the course of acute bronchiolitis occur in quiet sleep.