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Sources of Variation in the QT Readings: What should you be Aware of?

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Fig. 1 Reviewing rounds in the manual determination of the Q-onset and T-end  The Q-onset and T-end thresholds used during the delineation are shown in Table 1
Table 2. Mean and standard deviations of each referee after the 3rd round  Q onset deviations [ms]  T end deviations [ms]
Fig. 3 Example of the electromyographic  noise influence on the QT measurement  Mains interference
Fig. 5 The baseline drift noise is usually not influencing the correct QT measurements  Low magnitude of the T wave
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