Patent ID: 8265738

Claim:
A method of assessing synchrony of a ventricular contraction, said method comprising: acquiring a first type of cardiac electrogram comprising QRS complex information using a first set of electrodes while also acquiring a second type of cardiac electrogram comprising R-wave information using a second set of electrodes different from the first set of electrodes, wherein the first type of cardiac electrogram and the second type of cardiac electrogram comprise the same ventricular contraction; determining a width of a QRS complex from the QRS complex information contained in the first type of cardiac electrogram; determining a time of occurrence of an R-wave from the R-wave information contained in the second type of cardiac electrogram; determining a time from a beginning of the QRS complex to the occurrence of the R-wave; processing the width of the QRS complex together with the time to obtain a measure; and comparing the measure to a threshold to classify the ventricular contraction as synchronous or dyssynchronous.