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Snoring children: factors predicting sleep apnea
P Nieminen1, U Tolonen, H Löppönen
1Department of Otolaryngology, Oulu University Hospital, Finland.
Insights
Parent-reported nightly apneas are the strongest indicator for childhood obstructive sleep apnea syndrome (OSAS). While clinical factors like snoring and restless sleep also increase risk, polysomnography (PSG) is crucial for diagnosis.
Area of Science:
- Pediatrics
- Sleep Medicine
- Otolaryngology
Background:
- Snoring in children often presents with obstructive symptoms, making it challenging to assess the risk of obstructive sleep apnea syndrome (OSAS) based solely on clinical evaluation.
- Parental reports of snoring severity and associated symptoms are crucial but require objective validation.
Purpose of the Study:
- To evaluate the relative risk (RR) of obstructive sleep apnea syndrome (OSAS) in children who snore.
- To compare parental symptom reporting and clinical findings with polysomnography (PSG) results to identify key risk factors for pediatric OSAS.
Main Methods:
- Overnight polysomnography (PSG) was used to diagnose OSAS, with an apnea index (AI) greater than or equal to 1 defining the condition.
- Parental reports on snoring frequency, sleep patterns, and daytime symptoms were collected and correlated with PSG findings.
- Relative risk (RR) ratios and confidence intervals (CI) were calculated for various clinical and historical factors.
Main Results:
- Parent-reported nightly apneic episodes were the most significant risk factor for OSAS (RR 3.6).
- Other significant risk factors included constant snoring (RR 1.5), restless sleep (RR 2.1), previous adenoidectomy (RR 1.7), and tonsillar enlargement (RR 1.4).
- Absence of excessive daytime sleepiness was a protective factor (RR 0.3), suggesting OSAS is not solely linked to upper airway obstruction.
Conclusions:
- Obstructive sleep apnea syndrome (OSAS) in children cannot be reliably diagnosed without polysomnography (PSG).
- Parental reporting of specific symptoms, particularly nightly apneas, is vital for risk assessment.
- Clinical decision-making for snoring children with obstructive symptoms must integrate objective PSG findings with identified risk factors.
Abstract:
Many snoring children present obstructive symptoms according to their parents. The seriousness of the symptoms and the possibility of the obstructive sleep apnea syndrome (OSAS) in these children may be difficult to judge on the basis of the clinical findings and the patient's history only. In order to evaluate snoring children's relative risk (RR) to have OSAS, their symptoms and signs, as reported by the parents, and clinical findings were compared with the results of overnight polysomnography (PSG). An obstructive apnea index (AI) > or = 1 in PSG was regarded as the criterion for OSAS. The mean AI was 1.55 (range 0-15), and 29 children had a pathological AI, while 49 had a normal PSG recording. Apneic episodes every night detected by the parents was the most important single risk factor for OSAS (RR 3.6, 95% confidence interval (CI) 1.7-7.7). The RR ratio decreased when apneas appeared less frequently, but any detected apnea was still a single risk factor (RR 1.4, CI 1.2-1.8). The other risk factors of night-time symptoms were constant snoring (RR 1.5, CI 1.0-2.1) and restless sleep (RR 2.1, CI 1.1-4.0). Of the daytime symptoms, absence of excessive sleepiness was a protective factor against OSAS (RR 0.3, CI 0.1-1.0). Previous adenoidectomy was found to be a risk factor (RR 1.7, CI 1.1-2.7), as was tonsillar enlargement (RR 1.4, CI 1.1-1.8). These two findings suggest that the epipharyngeal space does not play a central role in the development of OSAS in children. OSAS cannot be reliably diagnosed without PSG, which is the most important examination for snoring children with obstructive symptoms. For clinical decisions, the consideration of risk factors is essential.