How to Estimate QT Interval in Patients With Left or Right Bundle Branch Block: A Systematic Review

Conclusions The QT interval is overestimated in patients with LBBB or RBBB, when using conventional measurements. Several alternative correction formulae exist, which can be applied using standard measurements from ordinary electrocardiographic readings. However, it is currently unknown whether or not the QT prolongation observed in the presence of bundle branch block significantly increases the risk of arrhythmias, as these formulae have not been tested against patient-specific clinical outcomes.
Source: Journal of Clinical Psychopharmacology - Category: Psychiatry Tags: Brief Reports Source Type: research