A Novel Risk Score for Predicting the Difficulty in Leadless Pacemaker Implantation.

Area of Science:

• Cardiology
• Medical Imaging
• Interventional Cardiology

Background:

• The MICRA leadless pacemaker system is a common cardiac pacing method.
• MICRA implantation can present technical challenges.
• Identifying factors predicting procedural difficulty is crucial for patient care.

Purpose of the Study:

• To identify anatomical predictors of procedural difficulty during MICRA implantation.
• To develop a scoring system for risk stratification and procedural planning.

Main Methods:

• Retrospective analysis of 111 MICRA implantations with preoperative CT imaging.
• Classification of patients based on procedural difficulty (≥30 min or ≥3 deployment attempts).
• Logistic regression to identify independent predictors and develop a scoring system.

Main Results:

• 33% of patients experienced procedural difficulty.
• Predictors included right atrial enlargement, right ventricular septal angle, IVC-to-tricuspid valve angle, and posterior offset.
• The developed Difficulty Score showed excellent predictive ability (AUC = 0.87).

Conclusions:

• Preoperative CT reveals anatomical features linked to MICRA implantation difficulty.
• The proposed Difficulty Score aids in risk stratification and procedural planning for MICRA leadless pacemakers.