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For QT, T90 End was 103 (24) s and 126 (15) s after start versus stop of atrial pacing; a difference of 24 (27) s ( P = 0.006). The response pattern was similar for \u03c4 but IR did not differ significantly between pacing start and stop. The response pattern was similar for QT<jats:sub>peak<\/jats:sub> and also for QT and QT<jats:sub>peak<\/jats:sub> following ventricular pacing start and stop. The coefficients of variation for repeated measures were 7%\u201321% for T90 End and \u03c4. 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