Figure 1.

Rhythm strips (A) and heartprint (B) for a male patient with unknown clinical history. Heartprint shows sinus rates with NN intervals between 0.5 and 1 s, the number of intervening beats between two ectopic beats (NIB) were mostly 0, 1 and 3, and the coupling interval (CI) was relatively fixed. Case 44 from the PhysioNet Sudden Cardiac Death Data Base (Goldberger et al., 2000). For abbreviations, see text.