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Ventilatory response to CO2 in infants with alleged sleep apnoea
Insights
Parent reports of infant sleep apnea are not always reliable. Measuring ventilatory responses to carbon dioxide (CO2) can identify infants at risk of death, particularly those with no or negative responses.
Area of Science:
- Pediatric Pulmonology
- Neonatal Research
- Sleep Medicine
Background:
- Parental reports of sleep apnea in infants are common but require objective verification.
- Infant sleep-related breathing disorders can pose significant health risks.
- Understanding ventilatory control is crucial for assessing infant health.
Purpose of the Study:
- To investigate the reliability of parental reports of sleep apnea in infants.
- To assess the utility of ventilatory responses to carbon dioxide (CO2) in identifying at-risk infants.
- To explore the relationship between CO2 sensitivity and infant mortality or severe outcomes.
Main Methods:
- Investigated 28 infants with reported sleep apnea.
- Confirmed apnoeic periods during sleep in 15 infants via clinical observation.
- Measured ventilatory responses to CO2 in all infants, both awake and asleep.
Main Results:
- Confirmed sleep apnoea in 15 out of 28 infants.
- Observed a wide range of CO2 sensitivities among infants.
- Identified four infants with no or paradoxical ventilatory responses to CO2.
- Two infants with absent/paradoxical responses later died; one required respiratory support, and one normalized CO2 sensitivity.
Conclusions:
- Parental reports of infant sleep apnea may not always be accurate.
- Ventilatory response to CO2 is a valuable tool for identifying infants at risk of death.
- Absent or negative CO2 responses are potential indicators of high-risk infants, possibly linked to Sudden Infant Death Syndrome (SIDS).
Abstract:
Twenty-eight children whose parents reported sleep apnoea were investigated. In 15 infants apnoeic periods during sleep could be confirmed during clinical observation. Ventilatory responses to CO2 were measured in all infants, in 23 during sleep in 5 only when awake. A very wide range of CO2 sensitivities was found. In four children there was no ventilatory response or even a paradox one: a decrease in ventilation as PACO2 was increased. Two of these non-responding children died later, one still sleeps in a respirator aged three, and one developed a normal CO2 sensitivity a few months later. It is concluded that the parent's account of an apnoeic incident during sleep is not always reliable. A ventilatory response to CO2 is a useful tool with which to identify infants at risk of death, possibly related to a defective control of ventilation. The actual value of the CO2 sensitivity hardly gives any useful information, due to the wide range of "normal" reactions. No or negative ventilatory responses to CO2 seem to be indicators of high risk children, and may possibly play a role in SIDS incidents.