Apparatus and method for detecting and filtering noise artifacts by analysis of a cardiac vectogram is disclosed. An active medical device collects electrical activity signals of a patient's heart over a series of cardiac cycles. At least two distinct temporal components (Vbip, Vuni) are obtained from at least two endocardial electrogram (EGM) signals that are collected concurrently on different respective channels from the same heart cavity. The means for analyzing and filtering of the active medical device operates by: constructing a non-temporal 2D characteristic of a vectogram (VGM) of an analyzed cardiac cycle, using a variation of one of the two distinct temporal components (Vuni) as a function of the other (Vbip)； conducting a morphological analysis of the non-temporal 2D characteristic to derive at least one intrinsic descriptor parameter, including the average angle of velocity vectors of consecutive data points of the 2D characteristic, and classifying the analyzed cardiac cycle as invalid noisy cycle or as valid not noisy cycle, depending on the analysis of the descriptor parameter.
