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Heart rate, PR, and QT intervals in normal children: a 24-hour Holter monitoring study
M Romano1, M Clarizia, E Onofrio
1Institute of Internal Medicine, II School of Medicine, University of Naples, Italy.
Insights
This study establishes normal electrocardiographic ranges for healthy children aged 6-11. Findings detail atrioventricular conduction time (PR), heart rate (HR), and QT intervals, crucial for identifying pediatric cardiac conditions.
Area of Science:
- Pediatric Cardiology
- Clinical Electrophysiology
- Biomedical Engineering
Background:
- Establishing normative electrocardiographic (ECG) parameters in pediatric populations is essential for accurate diagnosis.
- Previous studies may lack comprehensive data on dynamic ECG parameters in healthy children.
- Understanding normal variations in PR interval, heart rate, and QT interval is critical for identifying potential cardiac abnormalities.
Purpose of the Study:
- To determine the normal range of atrioventricular conduction time (PR), heart rate (HR), and QT interval in healthy children using dynamic Holter monitoring.
- To provide reference data for pediatric electrocardiographic parameters that can be used for comparison in clinical settings.
- To establish a baseline for evaluating cardiac function in children suspected of having heart conditions.
Main Methods:
- A dynamic electrocardiographic Holter monitoring study was conducted on 32 healthy children (20 males, 12 females) aged 6-11 years.
- Clinical and noninvasive instrumental examinations were performed to ensure the absence of heart disease.
- Measurements included atrioventricular conduction time (PR), heart rate (HR), and QT interval, with HR-corrected QT (QTc) also calculated.
Main Results:
- PR interval varied from 154 ± 10 ms at HR ≤ 60 to 102 ± 12 ms at HR ≥ 120.
- Mean heart rate was 87 ± 10 bpm, with daytime mean HR of 93 ± 10 bpm and nighttime mean HR of 74 ± 11 bpm.
- Mean QTc ranged from 388 ± 8 ms (HR ≤ 60) to 403 ± 14 ms (HR > 120).
Conclusions:
- This study provides valuable normative data for PR, HR, and QT intervals in healthy children.
- These findings serve as a crucial reference for pediatricians and cardiologists when assessing children's cardiac health.
- The established ranges aid in the early detection and management of potential cardiac abnormalities in pediatric patients.
Abstract:
A dynamic electrocardiographic Holter monitoring study was performed in 32 healthy children (20 males and 12 females, age range 6-11 years old), without heart disease, according to clinical and noninvasive instrumental examination. We evaluated atrioventricular conduction time (PR), heart rate (HR), and QT interval patterns defining the range of normality of these electrocardiographic parameters. The PR interval ranged from 154 +/- 10 ms (mean +/- SD) for HR less than or equal to 60 to 102 +/- 12 ms for HR greater than or equal to 120 (range 85-180). The absolute mean HR was 87 +/- 10 beats/min (range 72-104), the minimum observed HR being 61 +/- 10 (range 51-79), the maximum 160 +/- 20 beats/min (range 129-186). Daytime mean HR gave a mean value of 93 +/- 10 (range 71-148), while during night hours it was 74 +/- 11 (range 54-98). The minimum QT interval averaged 261 +/- 10 ms for HR greater than 120 and the maximum 389 +/- 9 ms for HR less than or equal to 60; the corresponding mean value of QTc (i.e., QT corrected for HR) ranged from 388 +/- 8 for HR less than or equal to 60 beats/min to 403 +/- 14 ms for HR greater than 120 beats/min. The results of the present study provide data of normal children which can be readily compared against those of subjects in whom cardiac abnormalities are suspect or patient.(ABSTRACT TRUNCATED AT 250 WORDS)