QRS Width > 150 ms Response Ratio Calculator

QRS Width >150 ms Response Ratio: Explanation and Clinical Context The QRS Width >150 ms Response Ratio is derived from the MADIT-CRT trial, which studied the effect of cardiac resynchronization therapy (CRT) in patients with mild heart failure and wide QRS complexes. Patients with a QRS duration greater than 150 ms had a significantly higher likelihood of favorable response to CRT compared to those with narrower QRS complexes. The response ratio (~1.64) indicates the relative probability of improvement in left ventricular function and reduction in heart failure events in patients with QRS >150 ms.

This tool helps clinicians estimate the likelihood of CRT efficacy based on baseline QRS duration.