A system, comprising: a lead having multi-site left ventricular, MSLV, electrodes (132-138); a lead having right ventricular, RV, electrodes : memory configured to store program instructions; one or more processors that, when executing the program instructions, are configured to: deliver cardiac resynchronization therapy, CRT, at one or more pacing sites from the MSLV electrodes (132-138); and obtain cardiac signals, associated with a candidate beat, from the MSLV electrodes (132-138) distributed along a left ventricle, characterized in that the MSLV electrodes (132-138) comprises a distal left ventricular, LV, electrode, LVD1, , a first mid-LV electrode, LVM2, , a second mid-LV electrode, LVM3, and a proximal LV electrode, LVP4, , the one or more processors are, when executing the program instructions, further configured to: analyze the cardiac signals to collect a MSLV conduction pattern comprising mean LV activation times relative to an RV activation time and associated with an RV-to-LVD1 activation interval, an RV-to-LVM2 activation interval, an RV-to-LVM3 activation interval, and an RV-to-LVP4 activation interval; compare the MSLV conduction pattern to one or more associated templates ; label the candidate beat as a pseudo-fusion beat based on the comparing; and adjust the CRT based on the labeling. a lead having multi-site left ventricular, MSLV, electrodes (132-138); a lead having right ventricular, RV, electrodes : memory configured to store program instructions; one or more processors that, when executing the program instructions, are configured to: deliver cardiac resynchronization therapy, CRT, at one or more pacing sites from the MSLV electrodes (132-138); and obtain cardiac signals, associated with a candidate beat, from the MSLV electrodes (132-138) distributed along a left ventricle, characterized in that deliver cardiac resynchronization therapy, CRT, at one or more pacing sites from the MSLV electrodes (132-138); and obtain cardiac signals, associated with a candidate beat, from the MSLV electrodes (132-138) distributed along a left ventricle, characterized in that the MSLV electrodes (132-138) comprises a distal left ventricular, LV, electrode, LVD1, , a first mid-LV electrode, LVM2, , a second mid-LV electrode, LVM3, and a proximal LV electrode, LVP4, , the one or more processors are, when executing the program instructions, further configured to: analyze the cardiac signals to collect a MSLV conduction pattern comprising mean LV activation times relative to an RV activation time and associated with an RV-to-LVD1 activation interval, an RV-to-LVM2 activation interval, an RV-to-LVM3 activation interval, and an RV-to-LVP4 activation interval; compare the MSLV conduction pattern to one or more associated templates ; label the candidate beat as a pseudo-fusion beat based on the comparing; and adjust the CRT based on the labeling. analyze the cardiac signals to collect a MSLV conduction pattern comprising mean LV activation times relative to an RV activation time and associated with an RV-to-LVD1 activation interval, an RV-to-LVM2 activation interval, an RV-to-LVM3 activation interval, and an RV-to-LVP4 activation interval; compare the MSLV conduction pattern to one or more associated templates ; label the candidate beat as a pseudo-fusion beat based on the comparing; and adjust the CRT based on the labeling. <EOS>