Implantable heart monitoring device

An implantable hear monitor comprising:

• a sensing unit configured to be connected to at least one electrode configured to pick up electric potentials,
• wherein the sensing unit is configured to
• process electrical signals corresponding to said electric potentials,
• detect signal components representing a myocardial contraction, and
• generate sense signals representing detected events corresponding to myocardial contractions;
• a signal quality analysis unit configured to
• determine whether a noise condition (NC) and/or a low signal indication is present for an event, and
• generate a noise condition and/or low signal indication signal;
• and
• an evaluation unit connected to said sensing unit and said signal quality analysis unit,
• wherein said evaluation unit is configured to
• evaluate sense signals and noise condition and/or low signal indication signals,
• treat the detected events as non-valid if a noise condition (NC) and/or low signal indication signal is present for that event, and
• use only intervals defined by two consecutive events which do not have a noise condition (NC) and/or a low signal indication to determine a rate of events of the sense signal.