Electrocardiographic optimization of interventricular delay in cardiac resynchronization therapy: a simple method to...

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Echocardiography is a standard but time-intensive method for optimizing cardiac resynchronization therapy (CRT) programming.
• A simpler, faster method for V-V interval optimization is needed.

Purpose of the Study:

• To correlate the optimal interventricular (V-V) pacing interval determined by echocardiography with that obtained using a surface electrocardiogram (ECG) method.
• To evaluate the feasibility of using ECG for V-V optimization in CRT.

Main Methods:

• Compared echocardiography-derived optimal V-V intervals with two ECG-based methods in 31 CRT patients.
• One ECG method used QRS narrowing; the second measured interventricular delay via pacing spikes to QRS onset in specific leads (T2-T1).

Main Results:

• Echocardiography identified optimal V-V intervals of -30 ms in 80% of patients.
• The ECG method measuring interventricular delay (T2-T1) showed 83% coincidence with echo results (r=0.81, P<0.001).
• The QRS narrowing ECG method showed only 32% coincidence (r=0.2, P=NS).

Conclusions:

• Surface ECG measurement of interventricular delay provides a reliable and faster alternative for V-V optimization in CRT.
• This ECG method correlates well with echo-derived optimal V-V intervals, potentially streamlining CRT programming.