A system for pacing a heart, comprising: an electrostimulation circuit configured to generate stimulation pulses for delivery at one or more target sites; and a control circuit (230; 430) configured to receive a cardiac electrical activity, the control (230; 430) circuit including: a capture verification circuit configured to detect a His-bundle capture status using the received cardiac activity; and a pacing control circuit configured to control the electrostimulation circuit to: generate a His-bundle pacing, HBP, pulse to capture a His-bundle of the heart; and generate a left-ventricular pacing, LVP, pulse to capture the left ventricle of the heart if the detected His-bundle capture status, in response to the HBP pulse, satisfies a specific condition; the system further comprising an ambulatory medical device AMD,, a first lead, a second lead, one or more electrodes (112A, 112B), and one or more left-ventricular electrodes (132A, 132B, 132C), wherein the AMD includes a sensing circuit configured to sense cardiac activity, wherein the AMD is configured to be coupled to (i) the first lead associated with the one or more electrodes (112A, 112B) to deliver the HBP pulse, and (ii) the second lead associated with the one or more left-ventricular electrodes (132A, 132B, 132C) to deliver the LVP pulse; characterized in that the HBP pulse to capture a His-bundle of the heart is generated after an atrial-to-His bundle interval subsequent to sensed atrial activity in a cardiac cycle. an electrostimulation circuit configured to generate stimulation pulses for delivery at one or more target sites; and a control circuit (230; 430) configured to receive a cardiac electrical activity, the control (230; 430) circuit including: a capture verification circuit configured to detect a His-bundle capture status using the received cardiac activity; and a pacing control circuit configured to control the electrostimulation circuit to: generate a His-bundle pacing, HBP, pulse to capture a His-bundle of the heart; and generate a left-ventricular pacing, LVP, pulse to capture the left ventricle of the heart if the detected His-bundle capture status, in response to the HBP pulse, satisfies a specific condition; a capture verification circuit configured to detect a His-bundle capture status using the received cardiac activity; and a pacing control circuit configured to control the electrostimulation circuit to: generate a His-bundle pacing, HBP, pulse to capture a His-bundle of the heart; and generate a left-ventricular pacing, LVP, pulse to capture the left ventricle of the heart if the detected His-bundle capture status, in response to the HBP pulse, satisfies a specific condition; generate a His-bundle pacing, HBP, pulse to capture a His-bundle of the heart; and generate a left-ventricular pacing, LVP, pulse to capture the left ventricle of the heart if the detected His-bundle capture status, in response to the HBP pulse, satisfies a specific condition; the system further comprising an ambulatory medical device AMD,, a first lead, a second lead, one or more electrodes (112A, 112B), and one or more left-ventricular electrodes (132A, 132B, 132C), wherein the AMD includes a sensing circuit configured to sense cardiac activity, wherein the AMD is configured to be coupled to (i) the first lead associated with the one or more electrodes (112A, 112B) to deliver the HBP pulse, and (ii) the second lead associated with the one or more left-ventricular electrodes (132A, 132B, 132C) to deliver the LVP pulse; characterized in that the HBP pulse to capture a His-bundle of the heart is generated after an atrial-to-His bundle interval subsequent to sensed atrial activity in a cardiac cycle.