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Rhythm strip (A) and the heartprint (B) for an 80-year-old male patient with unknown clinical history. Heartprint shows that NN intervals were between 0.4 and 0.8 s with a wide range of NIB values and coupling interval (CI) was highly variable. Case 48 from the PhysioNet Sudden Cardiac Death Data Base (Goldberger et al., 2000).
