A electromedical implant configured to improve arrhythmia detections based on active muscle noise detection, comprising: a device body comprising a device body electrode, a flexible lead body comprising a subcutaneous ECG electrode situated at the tip of said flexible lead body and a piezoelectric transducer embedded within the flexible lead body to generate a voltage based on vibrations or movements that cause deformation of the flexible lead body; a signal analysis element connected to said device body electrode, said subcutaneous ECG electrode and said piezoelectric transducer; a memory connected to said signal analysis element; said signal analysis element comprising at least one detection element (402, 412) configured to detect peak markers or signal features in the electrical signals obtained from said electrodes (103, 203) and said piezoelectric transducer; said signal analysis element is configured to determine if a potential arrhythmia condition exists based on said peak markers or said signal features detected in the electrical signals obtained from said electrodes (103, 203) by an analysis for specific sequences that are indicative for different arrhythmias; characterized in that said signal analysis element is further configured to analyze coherency of said peak markers or said signal features from said electrodes (103, 203) and said piezoelectric transducer; and, indicate an arrhythmia detection if said potential arrhythmia condition exists and said coherency is below a predefined threshold and indicate a false arrhythmia detection if said potential arrhythmia condition exists and said coherency is above said predefined threshold. a device body comprising a device body electrode, a flexible lead body comprising a subcutaneous ECG electrode situated at the tip of said flexible lead body and a piezoelectric transducer embedded within the flexible lead body to generate a voltage based on vibrations or movements that cause deformation of the flexible lead body; a signal analysis element connected to said device body electrode, said subcutaneous ECG electrode and said piezoelectric transducer; a memory connected to said signal analysis element; said signal analysis element comprising at least one detection element (402, 412) configured to detect peak markers or signal features in the electrical signals obtained from said electrodes (103, 203) and said piezoelectric transducer; said signal analysis element is configured to determine if a potential arrhythmia condition exists based on said peak markers or said signal features detected in the electrical signals obtained from said electrodes (103, 203) by an analysis for specific sequences that are indicative for different arrhythmias; characterized in that said signal analysis element is further configured to analyze coherency of said peak markers or said signal features from said electrodes (103, 203) and said piezoelectric transducer; and, indicate an arrhythmia detection if said potential arrhythmia condition exists and said coherency is below a predefined threshold and indicate a false arrhythmia detection if said potential arrhythmia condition exists and said coherency is above said predefined threshold.