Weight-Guided Constraints for Body Model and Lead Selection in Pediatric CIED MRI Safety Simulations

Area of Science:

• Biomedical Engineering
• Pediatric Cardiology
• Medical Imaging

Background:

• Pediatric patients with cardiac implantable electronic devices (CIEDs) have limited MRI access due to risks like RF-induced heating.
• Computational modeling is crucial for assessing MRI risks, but requires realistic patient and device models.
• Current guidance for pairing body models with clinically relevant CIED configurations is lacking.

Purpose of the Study:

• To derive weight-based constraints for pediatric CIED lead configurations.
• To improve the accuracy and clinical relevance of MRI safety simulations for pediatric CIED patients.
• To establish a framework for selecting appropriate lead types and lengths based on patient weight.

Main Methods:

• Retrospective analysis of 302 CIED surgeries in 281 pediatric patients.
• Statistical analysis to determine the relationship between patient weight, age, height, and lead implantation strategy (epicardial vs. endocardial).
• Analysis of lead length constraints based on patient weight.

Main Results:

• Patient weight alone effectively discriminated between epicardial and endocardial lead implantation (AUC = 0.90).
• The crossover weight for lead implantation approaches was 44 kg, with a broad transition zone (21-66 kg).
• Lead length was strongly correlated with weight, with specific constraints observed for very low and higher weights.

Conclusions:

• Patient weight is a sufficient metric for selecting appropriate CIED lead configurations in pediatric MRI safety simulations.
• A three-tier framework based on weight (epicardial-only <21 kg, dual 21-66 kg) and lead length constraints can guide simulation design.
• These findings enhance the clinical realism of simulations, potentially improving MRI access for pediatric CIED patients.