Biventricular stimulation device with shortened inter-ventricular delay

A biventricular cardiac stimulation device comprising:

• a pulse generator configured to interact respectively with ventricles of a heart to deliver stimulation pulses to each of the ventricles;
• a control unit connected to the pulse generator that operates the pulse generator to emit a stimulation pulse to a first-stimulated ventricle, followed by a VV time delay, followed by a stimulation pulse to a second-stimulated ventricle;
• an evoked response detector configured to interact with the ventricles and having independent, first and second ventricular sensing channels that detect ventricular evoked response in the respective ventricles, said evoked response detector searching for an evoked response following delivery of a stimulation pulse to said first-stimulated ventricle in an evoked response detection time window;
• said control unit setting said VV time delay to be shorter than said evoked response detection time window;
• and
• said evoked response detector closing said evoked response detecting time window, or discarding detections therein, in response to emission of the stimulation pulse to the second-stimulated ventricle during said evoked response detection time window following said first-stimulated ventricle.