Association of high blood pressure with heart rate variability in children

Area of Science:

• Pediatric Cardiology
• Cardiovascular Physiology
• Hypertension Research

Background:

• Childhood hypertension is a growing concern with long-term cardiovascular implications.
• Heart rate variability (HRV) reflects autonomic nervous system function and is a predictor of cardiovascular health.
• Understanding the relationship between HRV and hypertension in children is crucial for early intervention.

Purpose of the Study:

• To investigate the association between heart rate variability (HRV) and hypertension in Chinese children.
• To compare HRV parameters between children with high blood pressure and normotensive children.

Main Methods:

• 101 Chinese children were categorized into high and normal systolic blood pressure (SBP) groups, and high and normal diastolic blood pressure (DBP) groups.
• Heart rate variability (HRV) measurements were conducted, including time domain and power spectrum analyses.
• Circadian rhythm differences in HRV were assessed between daytime and nighttime recordings.

Main Results:

• Hypertensive children (high SBP and DBP groups) exhibited significantly lower 24-hour HRV values compared to normal groups.
• The typical daytime-nighttime differences in HRV parameters like LF/HF ratio and HF were abolished in hypertensive children.
• Specific HRV indices, including SDNN and Triangle Index, were significantly reduced in children with hypertension.

Conclusions:

• Hypertensive children demonstrate reduced HRV and a blunted circadian rhythm of HRV.
• Diminished HRV in childhood hypertension may serve as a potential pathophysiological link to adult cardiovascular diseases.
• These findings highlight the importance of monitoring HRV in pediatric hypertension for risk stratification.