Subject-matter relates inter alia, to an apparatus comprising:an implantable medical device, comprising:a first electrostimulation voltage generator, configured to generate a first electrostimulation voltagea first capacitor, coupled to the first electrostimulation voltage generator, and configured to be capable of storing the first electrostimulation voltagea second capacitor, wherein a capacitance of the second capacitor is configurable between different at least first and second capacitance valuesa processor, comprising an evoked-response sensing mode, the processor configured to place the second capacitor in series with the first capacitor during delivery of the first electrostimulation voltage to an electrostimulation target, such that the first capacitance value is used during the delivery when in an evoked-response sensing mode and the second capacitance value is used during the delivery when not in an evoked-response sensing mode, wherein the evoked-response sensing mode comprises at least one of an autocapture mode or an autothreshold mode, and wherein the processor is configured to re-configure the second capacitor from the second capacitance value to the first capacitance value when the evoked-response sensing mode is enabled, wherein the second capacitance value exceeds the first capacitance value, and wherein the processor is configured to re-configure the second capacitor from the second capacitance value to the first capacitance value by substituting a different capacitor for use as the second capacitor when the evoked-response sensing mode is enabled.
