An optimal QRST template cancellation method for extracting fibrillation wave

QRST cancellation is an important method for extracting fibrillation (F) waves from electrocardiogram (ECG) signals of body surface. Aiming at the disadvantage that the traditional cancellation methods were very sensitive to the morphology variation of QRST complex waves, an generation method for optimum QRST template with the meaning of least mean square errors was proposed. The principle of template cancellation method was thoroughly analyzed. Then the optimal linear representation coefficients for each heart beat QRST complex wave to generate the QRST template was derived, and the steps for generating the optimum template was given. The F wave extraction tests for both simulated and real atrial fibrillation ECG singals show that after applying the proposed method, the extraction effect of two traditional template cancellation methods, namely the average template cancellation method and spatiotemporal cancellation method, gets obviously improved.