Study of cardiac rate and rhythm patterns in ambulatory and hospitalized children

Area of Science:

• Pediatric Cardiology
• Clinical Electrophysiology

Background:

• Understanding normal heart rate and rhythm variations in children is crucial for accurate diagnosis.
• Distinguishing physiological variations from pathological conditions in pediatric electrocardiogram (ECG) monitoring is essential.

Purpose of the Study:

• To investigate potential differences in heart rate and rhythm patterns between healthy ambulatory children and those hospitalized for non-cardiac conditions.
• To establish a baseline for interpreting 24-hour Holter monitoring data in pediatric populations.

Main Methods:

• Utilized Holter monitoring to assess 24-hour ECG in 264 healthy ambulatory children and 112 hospitalized children.
• Analyzed heart rate parameters (maximal, mean, minimal) and rhythm disturbances, including arrhythmias and conduction blocks.

Main Results:

• Maximal, mean, and minimal heart rates decreased with age in both groups.
• Ambulatory children exhibited significantly higher maximal heart rates compared to hospitalized children.
• Sinus arrhythmia was universal; first- or second-degree atrioventricular block occurred during sleep in some children.
• Supraventricular and uniform ventricular extrasystoles were common.
• The incidence of arrhythmias and conduction disturbances was comparable between ambulatory and hospitalized children.

Conclusions:

• Age-related decreases in heart rate are consistent across ambulatory and hospitalized children.
• While maximal heart rate differs, the overall prevalence of arrhythmias and conduction disturbances is similar in both groups.
• The study provides a normative reference for pediatric 24-hour ECG analysis, applicable to both healthy and hospitalized children.