Right atrial appendage pacing in cardiac resynchronization therapy - haemodynamic consequences of interatrial...

Area of Science:

• Cardiology
• Cardiac Electrophysiology
• Medical Device Technology

Background:

• A patient with an artificial mitral valve and dual chamber pacemaker, initially implanted for complete atrioventricular block, experienced worsening heart failure.
• One year post-implantation, the patient underwent an upgrade to cardiac resynchronization therapy (CRT) with integrated implantable cardioverter-defibrillator (ICD) functionality.

Observation:

• Cardiac resynchronization therapy (CRT) demonstrated beneficial effects in managing the patient's advanced heart failure symptoms.
• However, pacing from the right atrial appendage led to unfavorable hemodynamic consequences.
• Significant interatrial conduction delay was observed during atrial pacing, creating a discrepancy between optimal sensed and paced atrioventricular delay (AVD).

Findings:

• The study illustrates the positive impact of CRT on heart failure progression.
• It identifies and emphasizes the negative hemodynamic effects associated with right atrial appendage pacing.
• A method for assessing interatrial conduction delay and optimizing the sensed-paced atrioventricular delay (AVD) offset using echocardiography in CRT patients is presented.

Implications:

• This report offers a practical approach for clinicians to evaluate and manage interatrial conduction delays in patients receiving CRT.
• Optimizing atrioventricular delay (AVD) settings is crucial for maximizing CRT efficacy and mitigating adverse hemodynamic effects.
• Echocardiography serves as a valuable tool for fine-tuning device parameters in complex cardiac device patients.