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Cervical posture and nasal breathing in infancy
1Shaare Zedek Medical Centre, Zamenhof Central Multispecialty Clinic, Tel Aviv, Israel.
Insights
Neonatal obligatory nose breathing is challenged by infants surviving airway obstruction. Cervical extension facilitates oral breathing by opening key sphincters, potentially linking infant sleep posture to sudden infant death syndrome.
Area of Science:
- Neonatal physiology
- Pediatric airway anatomy
- Respiratory regulation
Background:
- The prevailing theory posits that neonates are 'obligatory' nose breathers.
- Infant survival with conditions like choanal atresia or pyriform aperture stenosis challenges this notion.
- Understanding neonatal airway dynamics is crucial for infant health and safety.
Purpose of the Study:
- To investigate anatomical parameters influencing neonatal airway patency and obstruction.
- To challenge the theory of obligatory nasal breathing in neonates.
- To explore the mechanism facilitating the switch between nasal and oral breathing in infants.
Main Methods:
- Analysis of midsagittal anatomical sections of fetal and adult necks.
- Examination of head and neck radiographs from infants.
- Correlation of anatomical findings with infant breathing patterns.
Main Results:
- Infants can successfully breathe orally despite nasal obstruction.
- A key anatomical factor enabling oral breathing is cervical extension, creating neck lordosis.
- This cervical extension opens the veloglossal and veloepiglottic sphincters, facilitating oral airflow.
Conclusions:
- The theory of 'obligatory' nose breathing in neonates requires re-evaluation.
- Cervical extension is a critical anatomical mechanism for enabling oral breathing in infants.
- This physiological mechanism may offer insights into the relationship between infant sleep posture and sudden infant death syndrome (SIDS).
Abstract:
Survival of infants born with bilateral choanal atresia or pyriform aperture stenosis who breathe orally, as well as experimental data, challenge the virtually axiomatic theory of 'obligatory' nose breathing of the neonate. The anatomical parameters leading to the infant's airway patency and to airway obstruction were studied on midsagittal anatomical sections of fetal and adult necks as well as in head and neck radiographs of infants. The most important anatomical parameter found to facilitate the switch from nasal to oral ventilation in human infants is a cervical extension, creating a physiological lordosis of the neck that results in an opening of the veloglossal and veloepiglottic sphincters. This mechanism may explain the relationship between the sleeping posture of the infant and sudden infant death syndrome.