A switch driving circuit for driving a full-controlled power switch is disclosed, including a pulse-width modulation unit, a pulse transformer, an anti-interference module, a pulse-width demodulation unit and a driving-power amplifier. The method includes: placing a signal injection device proximate the pacer of the patient and injecting a signal across a skin barrier of the patient toward the pacer; in response to the signal received at the pacer, pacing the patient’s heart in a fixed asynchronous pacing mode; and, acquiring cardiac information relating to the patient’s fixed asynchronously paced heart. This is done by carrying out threshold value formation in the zone of the boundary regions of the partial volumes with result image Dz. The interior rearview mirror system may include a link with a mobile accessory that may be a personal accessory of an occupant of the vehicle, and the mobile accessory may include at least one of a keypad, a touch pad and a stylus-actuated screen.