 - Trifascicular block alternating bundle branch block or PR 200 ms with LBBB or other bifascicular block Note: It is required to run a 12 lead ECG and a 10s rhythm strip to document this exclusion criterion. During ECG acquisition, subjects must be in either their own intrinsic rhythm or, in subjects with an existing device implant, the device must be programmed to VVI 40 ppm. 