Performing a capture test on a stimulated cardiac cycle based on the analysis of a cardiac vectogram using an active medical device including circuits and control logic for delivering electrical stimulation pulses to a heart chamber； collecting electrical activity of the heart chamber and producing two distinct temporal components (Vbip, Vuni) from two distinct intracardiac electrogram EGM signals from the heart chamber. The capture test detects an occurrence of a depolarization wave induced by the stimulation of the heart chamber, and determines a two-dimensional non-temporal characteristic (VGM) representative of the stimulated cardiac cycle, from the variation of one of the temporal components (Vuni) versus the other temporal component (Vbip). A bi-dimensional analysis delivers at least one descriptor parameter of the two-dimensional non-temporal characteristic, and determines a presence or loss of a capture based on the at least one descriptor parameter.
