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We aimed to facilitate the assessment of the QT interval duration during conventional right ventricular pacing (VP) by uncovering relationships with the underlying QT interval during intrinsic atrioventricular conduction (IC).

The study patients (n = 122, age 68 ± 11 years) were dual-chamber device recipients with preserved IC and narrow QRS complexes. Patients were classified into either ‘normal-QT’ (n = 70) or ‘prolonged-QT’ (n = 52) group. Incremental atrial pacing rates were exercised to record serial QT/JT intervals over 5 min periods in IC mode and then in VP mode. Six different QT correction methods for heart rate were applied to assess the effect (i) of pacing mode (IC vs. VP) and (ii) of heart rate on the derived QT(c)/JT(c) intervals by mixed-effects linear models. Following VP, the uncorrected QT/JT intervals as well as the JTc intervals shortened …