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Figure 1 VPC Tachograms

Ventricular premature complex (VPC) tachograms showing normal (left) and abnormal (right) heart rate turbulence (HRT). HRT is composed of the transient acceleration phase of heart rate (R-R interval shortening) immediately after the compensatory pause followed by a subsequent and gradual deceleration phase (R-R interval prolongation). Orange curves show single VPC tachograms. Bold brown curves show the averaged VPC tachogram over 24 h.