Fig. 4
Representative Poincaré plots of (Image a) a patient in normal sinus rhythm (NA group), (Image b) an AF patient and (Image c) a patient with isolated PVC. For the NA patient, the Poincaré plot shows a narrow distribution with a single cluster; whereas for the AF patient, the Poincaré plot shows a broad, unorganized distribution. For the PVC patient, the Poincaré plot shows a distribution with 3 distinct populations (red arrow head = ectopic PVC beat, i.e., short beat following regular beat, purple arrow head = delayed beat following compensatory pause after PVC, i.e., long beat following short beat, and pink arrow head = recovery of normal sinus rhythm, i.e., regular beat following long beat), in addition to the regular “normal” beats (blue rectangle). VVi and VVi+1 are expressed in seconds