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Unusual respiratory response to oxygen in an infant with repetitive cyanotic episodes
P J Berger1, E M Skuza, V Brodecky
1Ritchie Centre for Baby Health Research, Institute of Reproduction and Development, Monash Medical Centre, Clayton, Victoria, Australia. philip.berger@med.monash.edu.au
Insights
High oxygen therapy can worsen infant respiratory instability, causing episodic breathing. This pattern, linked to central chemoreceptor issues, poses risks for infants with breathing disorders.
Area of Science:
- Pediatric Pulmonology
- Neonatal Respiratory Physiology
Background:
- High inspired oxygen is recommended for Cheyne-Stokes respiration in adults to prevent apnea and desaturation.
- The efficacy and safety of oxygen therapy in infants with respiratory instability require further investigation.
Observation:
- A case study of an infant with recurrent apnea and cyanosis is presented.
- Oxygen treatment induced episodic breathing, characterized by prolonged hyperpnea and apnea cycles.
- Discontinuation of oxygen led to severe desaturation before breathing resumed.
Findings:
- Episodic breathing is proposed as an unusual respiratory pattern involving central chemoreceptors.
- This pattern arises when the ventilatory threshold exceeds the apneic threshold, leading to unstable breathing.
- Carotid body activity, stimulated by severe desaturation, was crucial for restarting breathing in the infant.
Implications:
- Oxygen therapy may pose risks for infants with unstable breathing patterns.
- Understanding the mechanisms of episodic breathing is crucial for managing infant respiratory disorders.
- This case highlights the need for caution when using oxygen to treat apnea in infants.
Abstract:
High inspired oxygen concentrations have recently been recommended to control Cheyne-Stokes respiration in adults, with the intention of averting periodic apnea and its attendant arterial desaturation. We report a case study on an infant presenting with recurrent apnea and cyanosis in which oxygen treatment led to a gross form of respiratory instability we call episodic breathing, in which a breathing phase of 60 to 90 s alternated with an apnea lasting up to 60 s. When oxygen was discontinued, a profound arterial desaturation developed before breathing recommenced and restored oxygen levels. We propose that episodic breathing is an unusual respiratory pattern that involves the central chemoreceptors and results from the ventilatory threshold (the central PCO(2) at which breathing starts) lying considerably above the apneic threshold (the central PCO(2 )at which breathing stops). This feature predisposes to lengthy periods of hyperpnea alternating with lengthy periods of apnea. We suggest that when the case infant returned to air during episodic breathing, termination of apnea was entirely dependent upon carotid body activity, which reached a sufficient level to restart breathing only when arterial desaturation was severe. We conclude that oxygen therapy involves potential risks when employed to treat respiratory disorders involving unstable breathing patterns in the infant.