English to Czech Medical Medical: Cardiology Wireless Cardiac Stimulation system (WiCS)

In this sentence: "Implant the Electrode in excitable tissue with an acute electrical capture threshold less than 2V at 0.5ms pulse width."

This is a brief description of the device: "The Wireless Cardiac Stimulation® System (WiCS®) from EBR Systems, Inc. is an implantable, cardiac pacing system capable of delivering pacing level energy to the heart without using a lead. The technology used to achieve this leadless, wireless pacing is based on converting ultrasound energy to electrical energy. A subcutaneously implanted ultrasound transmitter initiates an ultrasonic energy pulse that travels through the tissue to intersect an ultrasound receiver implanted in the heart. The receiver converts the ultrasound energy to electrical energy at sufficient amplitudes to stimulate cardiac tissue through pacing electrodes that are integrated into the ultrasound receiver. This receiver is referred to herein as the Electrode."

I believe that the term "myocardial capture threshold" may relate to the term I am seeking.
I need particularly a suitable translation for the term "capture" in this context.

Target audience is medical professionals. All help is much appreciated.