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Signal averaged electrocardiography in infants and children with congenital heart disease
Insights
Surface averaged electrocardiography can detect His potentials in most congenital heart disease patients. This method may assess intraventricular conduction and post-operative arrhythmia risks in surgical patients.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Congenital heart disease (CHD) presents complex electrophysiological challenges.
- Accurate assessment of intraventricular conduction and arrhythmia risk is crucial post-surgery.
Purpose of the Study:
- To evaluate the feasibility and utility of high-resolution surface averaged electrocardiography (SAECG).
- To detect His potentials and ST segment delayed potentials in pediatric CHD patients.
Main Methods:
- SAECG was performed on 44 patients with various forms of CHD.
- Patients included those with complete transposition of the great vessels, tetralogy of Fallot, and septal defects.
- Signal-averaged electrocardiography utilized a high-resolution, purpose-built module.
Main Results:
- His potentials were recorded in 30 patients (68%), with amplitudes from 1.25 to 8.25 microV.
- Delayed potentials in the ST segment were detected in only one patient with frequent ventricular premature beats.
- The technique showed potential for assessing conduction abnormalities.
Conclusions:
- SAECG is feasible for detecting His potentials in CHD patients.
- This technique may aid in evaluating intraventricular conduction times and axis deviation.
- SAECG could improve risk stratification for arrhythmias after cardiac surgery.
Abstract:
Forty-four patients with congenital cardiac disease underwent surface averaged electrocardiography using a high resolution purpose built module. Twelve patients had complete transposition of the great vessels, 14 had tetralogy of Fallot, 5 had ventricular septal defects, 6 atrial septal defects, 3 atrioventricular septal defects and 4 patients had miscellaneous non-structural abnormalities. All patients with structural disorders underwent corrective or palliative surgery. The aim of the study was to examine the feasibility of the method and its usefulness in detecting His potentials and delayed potentials in the ST segment. A His potential was recorded in 30 patients (68%) with an amplitude ranging from 1.25 to 8.25 microV. Delayed potentials were recorded in only 1 patient with frequent ventricular premature beats. This technique may be useful in assessing intraventricular conduction times in patients with bundle branch block and/or axis deviation especially those who are at risk from intermittent complete AV block after surgical intervention. Detection of delayed potentials may allow better assessment of post-operative risk of ventricular arrhythmias in patients who have undergone ventricular surgery.