Inappropriate rate response in a leadless pacemaker due to automatic rate profile optimization.

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Leadless pacemakers, such as the Micra Transcatheter Pacing System, utilize accelerometer sensors for physiological rate adaptation.
• These devices aim to optimize heart rate based on detected patient activity levels, using setpoints for lower rate (LR), activity of daily living rate (ADLR), and upper rate (UR).

Observation:

• A case study involving a sedentary elderly patient with a leadless pacemaker revealed instances of inappropriate rate acceleration.
• These episodes occurred during periods of rest and specifically during chest physiotherapy sessions.

Findings:

• The accelerometer-based rate adaptation system in the leadless pacemaker demonstrated suboptimal performance in this patient.
• The detected acceleration was incorrectly translated into an undesirably high heart rate, particularly under specific conditions.

Implications:

• This case highlights the potential for rate-adaptation abnormalities in leadless pacemakers, even with advanced sensor technology.
• Understanding the underlying mechanisms and exploring various programming options are crucial for managing such events and ensuring patient safety.
• Further investigation into sensor setpoint optimization and patient-specific programming may be warranted for leadless pacemaker recipients.