Fig. 1. Examples of Poincaré plots analyzed from (A–C ) more than 100,000 and from (D ) 3,000 consecutive sinus beats. (A ) A comet-shaped pattern in a patient before coronary artery bypass graft (SD1–SD2 ratio = 0.22). (B ) A torpedo-shaped pattern in a postoperative patient (SD1–SD2 ratio = 0.34). (C ) A complex ball pattern in a postoperative patient (SD1–SD2 ratio = 0.46). (D ) A random-shaped pattern in a postoperative patient prior to a sepsis-like high cardiac output syndrome (SD1–SD2 ratio = 1.35).