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Spectral analysis of heart rate variability in spontaneously breathing very preterm infants
C Van Ravenswaaij-Arts1, J Hopman, L Kollée
1Department of Paediatrics, University Hospital, Nijmegen, The Netherlands.
Insights
Heart rate variability in preterm infants changes with maturation and sleep state. Respiration significantly impacts heart rate variability, even in very premature newborns, influencing autonomic nervous system development.
Area of Science:
- Neonatal physiology
- Cardiovascular research
- Autonomic nervous system function
Background:
- Heart rate variability (HRV) is a key indicator of autonomic nervous system (ANS) function.
- Understanding HRV development in preterm infants is crucial for assessing their health and predicting outcomes.
- Factors like maturation, sleep, and respiration are known to influence HRV.
Purpose of the Study:
- To investigate the impact of maturation, sleep state, and respiration on heart rate variability in preterm infants.
- To analyze changes in HRV during the early postnatal period.
- To explore the relationship between respiratory patterns and HRV components.
Main Methods:
- Studied 16 spontaneously breathing preterm infants (< 33 weeks gestation).
- Recorded ECG, respiratory impedance, and movements over the first three days of life.
- Analyzed R-R interval power spectrum, respiratory frequency, and breath amplitude oscillation frequency.
Main Results:
- Low-frequency HRV increased with gestational age.
- High-frequency HRV increased during early postnatal life.
- Sleep state affected very low-frequency HRV; respiration influenced respiratory sinus arrhythmia and breath amplitude sinus arrhythmia.
Conclusions:
- Gestational and postnatal age influence HRV in preterm infants, potentially due to changes in sympathetic and parasympathetic tone.
- Respiration plays a significant role in shaping HRV, even in very preterm infants.
- HRV analysis provides insights into the developing autonomic nervous system in vulnerable newborns.
Abstract:
The influence of maturation, sleep state and respiration on heart rate variability was studied in 16 spontaneously breathing preterm infants (< 33 weeks). ECG, respiratory impedance curve and movements were recorded four times a day, during the first three days of life. The power content of selected frequency bands of the R-R interval power spectrum, as well as respiratory frequency and breath amplitude oscillation frequency, were calculated for 3-min periods. An increase in low-frequency heart rate variability with gestational age was found. High-frequency variability increased during early postnatal life. Sleep state influenced very low-frequency heart rate variability. The amount of respiratory sinus arrhythmia and breath amplitude sinus arrhythmia was determined mainly by respiratory rate and breath amplitude oscillation frequency, respectively. The influences of gestational and postnatal age on heart rate variability might be due to an increase in sympathetic tone before birth and a change in parasympathetic-sympathetic balance after birth. Respiration has an important influence on heart rate variability, even in very preterm infants.