An implantable medical device can establish one or more artificial conduction pathways during tachyarrhythmia. The mobile terminal includes a metal rear cover used as a grounding component and at least one antenna, where the antenna includes a grounding pin, and the grounding pin is electrically connected to the metal rear cover. The filtration aid and at least some dirt becomes stirred up and re-coated on the filter medium by liquid flowing into the container when the filter is started up once more. The first step can be a flame assisted CVD step and the second step a plasma assisted CVD step or vice versa. To ascertain a change in speed, pulse intervals within a first allowable tolerance range are compared in a first step for equality and in a second step for inequality in terms of duration, during one wheel revolution.