All three types of septal contraction pattern can be observed in both ischemic (ICM) and non-ischemic (non-ICM) cardiomyopathy patients. In LBBB Type Ia, only the anteroseptum is dyskinetic. In LBBB Type Ib, both anteroseptum and inferoseptum are dyskinetic. In LBBB Type II, neither anteroseptum nor inferoseptum is dyskinetic. AS = anteroseptum, IS = inferoseptum.