Abstract
Pacemakers are a mainstay of therapy for patients with congenital and acquired heart block, but ventricular pacing is related to ventricular dysfunction. We sought to evaluate patient and device characteristics associated with ventricular dysfunction in pediatric patients with chronic ventricular pacing. This was a retrospective cohort of pediatric patients with heart block and chronic ventricular pacing. Patient, ECG, and device characteristics were analyzed to determine factors associated with ventricular dysfunction. Longitudinal ECG and echocardiogram parameters were obtained to track changes in QRS and systemic ventricular systolic function over time. In total, 82 patients were included (median age at implant 0.81 years). Over a follow-up time of 6.1 years, 18% developed ventricular dysfunction. Patients with dysfunction had greater current QRS duration (p = 0.002) compared to those with preserved function with a similar time from device implantation. There was no difference between lead location or age at device implantation. QRS duration increased with time from implant and the resultant ΔQRS was associated with ventricular dysfunction (p = 0.01). QRS duration >162 ms was associated with a 5.8 (2–9)-fold increased risk for dysfunction. Transvenous leads were associated with longer QRS duration with no difference compared to epicardial leads in development of ventricular dysfunction. This study demonstrated that the absolute paced QRS duration and Δpaced QRS were association with long-term ventricular dysfunction independent of how long a given patient was paced. Patients in high-risk categories may benefit from close echocardiographic monitoring. Whether permissive junctional rhythm or His bundle/biventricular pacing decreases the rate of dysfunction needs further study.
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Abbreviations
- CHB:
-
Congenital heart block
- CHD:
-
Congenital heart disease
- LBBB:
-
Left bundle branch block
- PCM:
-
Pacemaker
- LV:
-
Left ventricular
- RV:
-
Right ventricular
- BIV:
-
Biventricular
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RJC—primary author and involved in study design, statistical analysis, and manuscript creation. ZG—involved in study design and statistics. JA—involved in critical manuscript review. DS—involved in study design and manuscript review. NO—involved in study design and statistics. TK—involved in manuscript creation and review.
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Czosek, R.J., Gao, Z., Anderson, J.B. et al. Progressive QRS Duration and Ventricular Dysfunction in Pediatric Patients with Chronic Ventricular Pacing. Pediatr Cardiol 42, 451–459 (2021). https://doi.org/10.1007/s00246-020-02504-x
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DOI: https://doi.org/10.1007/s00246-020-02504-x