Correlation of Mechanical Dyssynchrony with QRS Duration Measured by Signal-Averaged Electrocardiography

Background: Preimplantation left ventricular dyssynchrony is considered a prerequisite for a beneficial response to cardiac resynchronization therapy (CRT). However, electrical dyssynchrony estimated by QRS duration (QRSd) on ECG has not been proven to be an optimal surrogate of mechanical dyssynchr...

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