The document discusses arrhythmias, which are irregular heartbeats that can lead to serious health risks, and highlights the importance of electrocardiograms (ECGs) in diagnosing these conditions. It covers various methods for heartbeat segmentation, feature extraction, and classification of ECG signals, particularly using machine learning and deep learning techniques to improve accuracy in arrhythmia detection. The conclusion indicates that while ECG is crucial for identifying heart abnormalities, challenges remain with accuracy and computational complexity as the number of arrhythmia classes increases.