Morning levels of C-reactive protein in children with obstructive sleep-disordered breathing
Athanasios G Kaditis1, Emmanouel I Alexopoulos, Efthimia Kalampouka
1Department of Pediatrics, University of Thessaly School of Medicine and Larissa University Hospital, , P.O. Box 1425, Larissa 41110, Greece. kaditia@hotmail.com
Insights
This study found no significant difference in C-reactive protein (CRP) levels between children with and without sleep-disordered breathing. Elevated CRP, a marker of inflammation, was not linked to snoring severity or sleep apnea indices in pediatric subjects.
Area of Science:
- Pediatric Sleep Medicine
- Cardiovascular Health
- Inflammation Markers
Background:
- Obstructive sleep-disordered breathing (SDB) in adults is linked to cardiovascular disease.
- Elevated C-reactive protein (CRP) is a proposed inflammatory link between SDB and cardiovascular issues in adults.
Purpose of the Study:
- To investigate if children with SDB exhibit higher CRP levels compared to healthy controls.
- To determine the correlation between CRP levels and SDB severity in children.
Main Methods:
- Measured CRP in 39 non-snorers (controls) and 102 habitual snorers undergoing polysomnography.
- Categorized snorers based on apnea-hypopnea index (AHI): <1, 1-4.9, and ≥5 episodes/hour.
- Analyzed CRP correlation with AHI, respiratory movement/arousal index, SaO2 nadir, and oxygen desaturation.
Main Results:
- No significant differences in mean CRP values were found between control subjects and any group of snorers based on AHI.
- CRP levels did not correlate with AHI, arousal index, SaO2 nadir, or percentage of sleep time with saturation <95%.
- The proposed link between elevated CRP and SDB observed in adults was not replicated in this pediatric cohort.
Conclusions:
- Pediatric sleep-disordered breathing, even with habitual snoring, is not associated with elevated C-reactive protein levels.
- The inflammatory pathway suggested by CRP in adult SDB and cardiovascular disease does not appear to extend to children.
- Further research may be needed to explore other inflammatory markers or pathways in pediatric SDB.
Abstract:
Obstructive sleep-disordered breathing is associated with cardiovascular disease in adults, and elevated C-reactive protein (CRP) has been proposed as a link between the two disorders. We hypothesized that children with sleep-disordered breathing have higher CRP values than do control subjects. CRP was measured in 39 children (mean age +/- SD: 6.9 +/- 3.2 years) without snoring (controls) and in 102 children (6.2 +/- 2.2 years) with habitual snoring who underwent polysomnography. No significant differences were found in mean CRP values between control subjects (0.12 +/- 0.16 mg/dl; n = 39) and snorers with an apnea-hypopnea index of less than 1 episode/hour (0.15 +/- 0.26; n = 18), snorers with an index of 1 or more and less than 5 (0.15 +/- 0.26; n = 54), and snorers with an index of 5 or more (0.22 +/- 0.43; n = 30; p > 0.05). There was no correlation between CRP or log-transformed CRP values and apnea-hypopnea index, respiratory movement/arousal index, Sa(O(2)) nadir, oxygen desaturation (>/= 4%) of hemoglobin index, or percentage of sleep time with saturation less than 95% (p > 0.05). Thus, findings of higher CRP values in adults with sleep-disordered breathing and correlations of these values with polysomnography indices were not confirmed in children.
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