Figure 1 –

Study population consort diagram. The Echo database contains 157,586 unique patients. Black arrows show the number of patients removed for exclusionary criteria. Only 8,129 qualified for a baseline Echo. More patients with LBBB were subsequently excluded for receiving a cardiac device, LVAD, or transplant. Less NQRS patients died prior to a potential follow-up Echo. Only 659 patients were ultimately included in the study.