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Heart rate variability in infants subsequently suffering sudden infant death syndrome (SIDS)
K J Antila1, I A Välimäki, M Mäkelä
1Cardiorespiratory Research Unit, University of Turku, Finland.
Insights
Autonomic cardiovascular control, assessed via heart rate variability (HRV), did not differentiate infants who died of Sudden Infant Death Syndrome (SIDS) from healthy controls. While SIDS cases had less regular breathing, HRV analysis showed no significant differences.
Area of Science:
- Cardiology
- Pediatrics
- Autonomic Nervous System Research
Background:
- Sudden Infant Death Syndrome (SIDS) remains a significant concern in infant mortality.
- Understanding the role of autonomic cardiovascular control in SIDS is crucial for identifying potential risk factors.
Purpose of the Study:
- To investigate the role of autonomic cardiovascular control in SIDS by analyzing heart rate variability (HRV).
- To compare HRV parameters between infants who experienced SIDS and matched control infants.
Main Methods:
- Analysis of heart rate variability (HRV) from tape recordings of 16 term and 1 preterm infant SIDS cases and 23 matched controls.
- Comparison of overall and beat-to-beat HRV indices, average heart rate, and breathing rates using power-spectral techniques.
Main Results:
- SIDS cases exhibited a significantly lower number of regular breathing segments compared to controls (P = 0.02).
- No significant differences were observed in average heart rate, median breathing rate, or various HRV indices between SIDS cases and controls.
- Power-spectral analysis of HRV did not reveal significant intergroup differences in overall power distribution or respiratory HRV.
Conclusions:
- Heart rate variability analysis, including power-spectral techniques, did not differentiate infants who died of SIDS from surviving controls in this population.
- Autonomic cardiovascular control, as assessed by HRV, does not appear to be a distinguishing factor for SIDS in this study cohort.
Abstract:
To study the role of the autonomic cardiovascular control in SIDS the heart rate variability (HRV) was analysed from 24 tape recordings made from a prospective population-based study on 16 term and one preterm infant suffering SIDS and compared to similar data on 23 control infants matched on birthweight, gestation and postnatal age. The number of regular breathing segments was lower in the SIDS cases than in controls (P = 0.02). No significant differences were found between the SIDS cases and their controls for average heart rate, median breathing rate, indices of overall and beat-to-beat HRV. Neither were significant intergroup differences found when the subjects were divided into neonatal and postneonatal subgroups. Analysis of HRV by power-spectral techniques did not show any significant differences between SIDS cases and controls for the general distribution of power or for the respiratory HRV. Analysis of HRV did not differentiate infants destined to die of SIDS from surviving controls in the same population.