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Cardiac and respiratory patterns during sleep in cocaine-exposed neonates
M G Regalado1, V L Schechtman, A P Del Angel
1Department of Pediatrics, University of Southern California, School of Medicine, Los Angeles, USA.
Insights
Cocaine-exposed infants exhibit altered heart rate patterns during sleep compared to unexposed infants. These cardiovascular control differences suggest potential impacts of maternal cocaine use on infant autonomic physiology.
Area of Science:
- Neonatal physiology
- Cardiovascular research
- Developmental toxicology
Background:
- Maternal cocaine use during pregnancy is a significant public health concern.
- Prenatal exposure to cocaine may impact infant neurodevelopment and physiological regulation.
- Understanding the long-term effects of prenatal cocaine exposure is crucial for early intervention.
Purpose of the Study:
- To investigate cardiovascular control differences in neonates exposed to cocaine compared to controls.
- To assess heart rate and respiratory patterns during sleep and wakefulness in cocaine-exposed infants.
- To determine if the recency or presence of cocaine in neonates influences these physiological differences.
Main Methods:
- Collected 4-hour recordings of heart rate and respiration in 17 cocaine-exposed and 14 control infants at 2 weeks of age.
- Analyzed median values for heart rate and respiratory rate and variability during quiet and active sleep.
- Compared overall mean rates and variabilities between sleep states for each infant group.
Main Results:
- Cocaine-exposed infants demonstrated significantly greater sleep state effects on heart rate compared to controls.
- Increased heart rate variability was observed in cocaine-exposed infants across both sleep states.
- No significant differences in respiratory rate or variability were found between the groups.
Conclusions:
- Infants with prenatal cocaine exposure exhibit distinct cardiovascular regulation compared to unexposed infants.
- These differences in heart rate patterns suggest alterations in autonomic nervous system function.
- The precise mechanisms remain unclear but may involve direct cocaine effects or indirect maternal use impacts on infant physiology.
Abstract:
Four-hour recordings of heart rate and respiration during spontaneous sleep and wakefulness were obtained from 17 cocaine-exposed and 14 control infants at 2 weeks of age. The median values for heart and respiratory rate and variability were determined for each 1-min epoch of quiet and active sleep. Overall mean rates and variabilities were determined for each state. The cocaine-exposed infants showed significantly greater sleep state effects on heart rate relative to the control infants. Recency of cocaine exposure was not a factor in the differences; even those cocaine-exposed infants who tested negative for the drug perinatally differed significantly from those who had never been exposed. Heart rate variability was increased in cocaine-exposed infants relative to controls in both sleep states. Respiratory rate and variability were not significantly different in the cocaine-exposed and control infants. These results suggest differences in cardiovascular control in infants of cocaine-abusing mothers compared to infants without cocaine exposure. The mechanism responsible for these differences is unclear and may reflect cocaine-induced changes in the autonomic physiology of developing infants or some indirect effect of maternal cocaine use.