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[Development of heart rate in newborn infants during quiet sleep]
A Patzak1, R Mrowka, D Lewinsohn
1Institut für Physiologie, Universitätsklinikum Charité, Humboldt-Universität, Berlin, Deutschland.
Insights
Heart rate control in newborns shows complex development, not linear. Heart rate power spectra parameters indicate a mature cardiorespiratory system by six months.
Area of Science:
- Cardiology
- Neonatal Physiology
- Autonomic Nervous System Development
Context:
- Limited research exists on heart rhythm maturation in early infancy.
- Understanding heart rate control development is crucial for assessing infant health.
- Previous studies offered only rudimentary insights into heart rate regulation maturation.
Purpose:
- To investigate the developmental patterns of heart rate variability (HRV) and its relationship with respiratory patterns in newborns.
- To analyze heart rate power spectra parameters from birth to six months of age.
- To correlate cardiorespiratory parameters to understand autonomic nervous system maturation.
Summary:
- ECG and respiratory effort were recorded in 10 newborns across 13 sessions from birth to six months.
- Analysis of heart rate power spectra (Total Power, LF, HF, LF/HF) revealed non-linear developmental trends.
- Parameters initially increased, then decreased, followed by a later increase, correlating with breathing rate, suggesting cardiorespiratory maturation.
Impact:
- Provides detailed insights into the non-linear maturation of heart rate control in the first six months of life.
- Highlights the intricate relationship between cardiac and respiratory development in neonates.
- Suggests a mature cardiorespiratory system by six months, offering a baseline for clinical assessment.
Abstract:
The small number of investigations of the development of heart rhythm during the first half year of life provide only rough ideas regarding the maturation of heart rate control. In the present study, in 10 newborns, ECG and respiratory effort were recorded in 13 sessions from birth up to the sixth month. The total power (TP), power in the low (LF) and high frequency range (HF), and the ratio LF/HF were used from the heart rate power spectra. All parameters reveal no linear developmental patterns: TP, LF, and HF increase during the first days to a maximum, then decrease subsequently and remain low until the second month. TP and HF increase between the second and sixth month. LF/HF increases up to the second month followed by a decrease down to the sixth month. The developmental courses of TP, HF and LF/HF correlate with the course of breathing rate (BR), whereby high BR is associated with low HF and TP. The results hint at a maturated cardiorespiratory system.