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The "nasal cycle" in infants
1Paediatric department, Rotunda Hospital, Dublin.
Insights
Infants often show different end-tidal carbon dioxide levels between nasal airways during sleep, suggesting common partial nasal obstruction. This finding is crucial for assessing infant respiratory control and sudden infant death syndrome risk.
Area of Science:
- Pediatrics
- Respiratory Physiology
- Neonatal Medicine
Background:
- End-tidal carbon dioxide (CO2) monitoring is vital for assessing infant respiratory control and sudden infant death syndrome (SIDS) risk.
- Nasal airway function in infants is complex, influenced by factors like mucosal swelling, asymmetry, the nasal cycle, and autonomic control.
Purpose of the Study:
- To investigate the difference in end-tidal carbon dioxide (CO2) levels between nasal airways in infants during quiet sleep.
- To determine the clinical significance of unilateral nasal airway differences in CO2 measurements for infant respiratory assessment.
Main Methods:
- Measurement of end-tidal carbon dioxide (CO2) levels in both nasal airways of 100 infants during quiet sleep.
- Statistical analysis to compare CO2 values between the left and right nasal airways.
Main Results:
- A significant difference in end-tidal carbon dioxide (CO2) levels was observed between nasal airways in 93% of infants studied (4.88 Kpa vs. 3.3 Kpa, P < 0.001).
- These findings suggest that partial nasal obstruction is a common occurrence in infants.
Conclusions:
- The preferential use of one nasal airway in infants is common and impacts end-tidal carbon dioxide (CO2) measurements.
- Clinicians must consider unilateral nasal airway differences when interpreting CO2 data for respiratory control and SIDS risk assessment in infants.
Abstract:
In 93 of 100 infants there was a marked difference in the measured end-tidal carbon dioxide (CO2) level between nasal airways during quiet sleep (4.88 Kpa V 3.3 Kpa P less than 0.001). It is suggested that partial nasal obstruction is common in infants. Nasal airway resistance is increased by mucosal swelling, is assymetric, regularly alternates between sides (the nasal cycle), and is under autonomic control. End tidal carbon dioxide values are widely measured as part of an assessment of respiratory control and risk of sudden infant death syndrome. The preferential use of one nasal airway must be taken into account in assessing such results.