QT interval correction in LBBB: Improving the accuracy of an imperfect measurement.

The authors comment on a study published within the issue which described a semiempiric formula that allows estimation of the true QT interval in left bundle brunch block (LBBB) on a per patient basis. Topics covered include the need to have a reliable and simple technique to assess QT interval in LBBB in the practice of clinical electrophysiology, and questions that need to be answered before the QT derived in the study become a surrogate and a sub-stitute for the manually measured QT.