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Figure 2 Lead V5. Upper panel: Preinflation and inflation SAECGs in the standard frequency range. Lower panel: The same SAECGs within the high-frequency range (150–250 Hz). The amplitude scales are from –700 to +1000 µV for the standard frequency range and –20 to +20 µV for the high-frequency range. The dashed lines indicate the QRS duration, determined from the standard frequency ECG. ECG = electrocardiogram, SAECG = signal-averaged electrocardiogram.