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Cardiovascular impact of intravenous caffeine in preterm infants
Jacqueline Huvanandana1,2, Cindy Thamrin2, Alistair L McEwan1,3
1School of Electrical and Information Engineering, University of Sydney, Sydney, NSW, Australia.
Insights
Intravenous caffeine acutely alters autonomic nervous system function in preterm infants, affecting heart rate and blood pressure variability. This suggests careful consideration for caffeine administration in infants with impaired cerebral autoregulation.
Area of Science:
- Neonatal Physiology
- Autonomic Nervous System Research
- Pharmacodynamics
Background:
- Preterm infants often require pharmacological support for cardiorespiratory regulation.
- Caffeine is commonly used to manage apnea of prematurity.
- Understanding caffeine's acute physiological effects is crucial for optimizing treatment.
Purpose of the Study:
- To investigate the immediate impact of intravenous caffeine on heart rate and blood pressure variability in preterm infants.
- To analyze changes in both linear and nonlinear variability metrics post-caffeine administration.
Main Methods:
- Linear and nonlinear features of heart rate and blood pressure variability were extracted.
- Data were collected before and two hours after a 10 mg/kg caffeine base loading dose.
- Analysis included detrended fluctuation analysis and Poincare plots.
Main Results:
- Caffeine administration reduced scaling exponents (α1, α2) in mean arterial pressure.
- An increased ratio of short-term to long-term variability (SD1/SD2) was observed in blood pressure.
- Heart rate variability showed a reduction in α1, suggesting increased vagal tone, and pulse pressure variability increased.
Conclusions:
- Intravenous caffeine administration appears to enhance autonomic nervous system responsiveness in preterm infants.
- Increased pulse pressure variability post-caffeine may have implications for infants with compromised cerebral autoregulation.
- Further research is warranted to elucidate the clinical significance of these findings.
Aim:
To evaluate the acute effect of intravenous caffeine on heart rate and blood pressure variability in preterm infants.
Methods:
We extracted and compared linear and nonlinear features of heart rate and blood pressure variability at two time points: prior to and in the two hours following a loading dose of 10 mg/kg caffeine base.
Results:
We studied 31 preterm infants with arterial blood pressure data and 25 with electrocardiogram data, and compared extracted features prior to and following caffeine administration. We observed a reduction in both scaling exponents (α1 , α2 ) of mean arterial pressure from detrended fluctuation analysis and an increase in the ratio of short- (SD1) and long-term (SD2) variability from Poincare analysis (SD1/SD2). Heart rate variability analyses showed a reduction in α1 (mean (SD) of 0.92 (0.21) to 0.86 (0.21), p < 0.01), consistent with increased vagal tone. Following caffeine, beat-to-beat pulse pressure variability (SD) also increased (2.1 (0.64) to 2.5 (0.65) mmHg, p < 0.01).
Conclusion:
This study highlights potential elevation in autonomic nervous system responsiveness following caffeine administration reflected in both heart rate and blood pressure systems. The observed increase in pulse pressure variability may have implications for caffeine administration to infants with potentially impaired cerebral autoregulation.
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