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Figure 1 A theoretical mechanical restitution curve (MRC): a (units are percent baseline LV+dP/dtmax) and d (units are percent baseline R-R interval) represent the horizontal and vertical asymptotes, respectively; the parameter c (units are percent baseline LV+dP/dtmax) represents the reduction in LV+dP/dtmax with a 40% reduction in R-R interval (13). LV+dP/dtmax = maximal rate of increase of left ventricular pressures.
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