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Artificial Intelligence in Health A fuzzy system for heartbeat classification

Figure 7. Feature annotating on the electrocardiogram, including feature extraction over 30 min and a closer-up view (illustration by the authors)

A B C

D E F

G I
H

J K L

Figure 8. Features histograms of NSR ECG record (200). (A) QRS intervals. (B) PR intervals. (C) PR segments. (D) P wave intervals. (E) P amplitudes.
(F) R amplitudes. (G) Q Onset amplitudes. (H) S offset amplitudes. (I) ST intervals. (J) QT intervals. (K) ST segments. (L) RR ratio (illustration by the
authors)
Abbreviations: ECG: Electrocardiogram; NSR: Normal sinus rhythm.

Volume 1 Issue 4 (2024) 53 doi: 10.36922/aih.3367