New formula for defining “normal” and “prolonged” QT in patients with bundle branch block - A variant of Bogossian's formula

With great interest we read the publication by Yankelson et al. who describe another formula to estimate the QT interval in patients with left bundle brunch block [1]. We feel greatly honoured that our previous work could spark further investigations from these renowned cardiologists in this sometimes complex field of research. Yankelson et al. focused on the role of the JT interval in defining a normal QT interval in a patient population, developing LBBB after transcutaneous valve replacement. In our Heart Rhythm Publication from 2014 (Study for development of the Formula for estimation the modified QT-interval) we already suggested either to subtract 50% of the LBBB-QRS-duration from the measured QT or to add 50% of the LBBB-QRS to the JT-interval to achieve the expected QT-interval [2].
Source: Journal of Electrocardiology - Category: Cardiology Authors: Source Type: research