Which parameter duration is a typical criterion for cardiac resynchronization therapy?

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Multiple Choice

Which parameter duration is a typical criterion for cardiac resynchronization therapy?

Explanation:
Electrical dyssynchrony is what CRT targets, and it shows up as a widened QRS complex on the ECG. A QRS duration of 120 milliseconds or more indicates significant delay in ventricular activation, meaning the two ventricles aren’t contracting in sync. CRT works by pacing both ventricles to restore synchronized contraction, which can improve cardiac output and symptoms in patients with reduced ejection fraction. While low EF and worse symptoms (NYHA class II–IV) are part of overall CRT consideration, the specific duration criterion this question asks about is the QRS duration.

Electrical dyssynchrony is what CRT targets, and it shows up as a widened QRS complex on the ECG. A QRS duration of 120 milliseconds or more indicates significant delay in ventricular activation, meaning the two ventricles aren’t contracting in sync. CRT works by pacing both ventricles to restore synchronized contraction, which can improve cardiac output and symptoms in patients with reduced ejection fraction. While low EF and worse symptoms (NYHA class II–IV) are part of overall CRT consideration, the specific duration criterion this question asks about is the QRS duration.

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