Objective To explore the application of ECG scatterplot in analyzing competitive ar-rhythmias,know its electrophysiological characteristics and lay foundation for rapidly analyzing ambulatory electrocardiography( AECG). Methods Typical AECG cases with common competitive arrhythmias including pararrhythmia,autonomous cardiac rhythm,escaped rhythm and multifocal atrial tachycardia were selected. The morphological features of their ECG scatterplots were analyzed while the electrophysiological characteristics w...