The criteria for left bundle branch block have gained growing interest in the last few years. In this overview, we discuss diagnostic and prognostic aspects of different criteria. It was already shown that stricter criteria, including longer QRS duration and slurring/notching of the QRS, better identify responders to cardiac resynchronization therapy. We also include aspects of ST/T concordance and discordance and vectorcardiography, which could further improve in the fine-tuning of the left bundle branch criteria.
Keywords: QRS duration; QRS notched/slurred R waves in lateral leads; cardiac resynchronization therapy; concordant and appropriate discordance; left bundle branch block.
© 2019 Wiley Periodicals, Inc.