An electrocardiogram-based algorithm to detect loss of left ventricular capture during cardiac resynchronization...

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Diagnostics

Background:

• Loss of left ventricular capture in patients with cardiac resynchronization devices can worsen heart failure.
• Diagnosis typically requires a device programmer, complicating management.
• Distinct electrocardiogram (ECG) changes may indicate loss of capture.

Purpose of the Study:

• To determine if specific ECG morphologic changes can identify loss of left ventricular capture.
• To develop a non-invasive method for detecting loss of left ventricular capture.

Main Methods:

• An algorithm was developed based on the R-S spike ratio in the 12-lead ECG.
• Analysis was performed during right ventricular and biventricular pacing in 54 patients with cardiac resynchronization devices and left bundle-branch block.
• Leads V1 and I were assessed after confirming biventricular pacing and simulating loss of left ventricular capture by programming to right ventricular pacing only.

Main Results:

• The algorithm demonstrated high accuracy in detecting loss of left ventricular capture.
• Sensitivity was 94% and specificity was 93%.
• The likelihood ratios indicated a strong positive (12.8) and negative (0.06) test result.

Conclusions:

• An algorithm analyzing the R-S ratio on ECG leads V1 and I can accurately detect biventricular capture and loss of left ventricular capture.
• This method provides a reliable, non-invasive tool for managing cardiac resynchronization therapy.
• The algorithm's effectiveness was confirmed in patients with right ventricular leads placed at the right ventricular apex.