Patients with standard indication for pacemaker therapy or Cardiac Resynchronization Therapy (CRT), who will be implanted with a pacemaker or CRT device of the Eluna pacemaker family. Single-, Dual- and Tripple-chamber pacemakers are applicable.

Heart failure patients with indication for Cardiac Resynchronization Therapy (CRT) therapy, who will be implanted with the left ventricular Sentus BP lead. Patients can receive either CRT pacemaker or CRT-D (CRT with defibrillator function).

New pacemaker generation with new functions, like wandless RF telemetry "SafeSync"

The safety of the Eluna pacemaker family will be evaluated by asking the investigator to record any adverse event. While all adverse events have to be recorded throughout the study, only the number of SADEs possibly or securely related to the pacemaker will be the basis for endpoint calculation of the SADE-free rate.

The safety of the Sentus BP left ventricular lead will be evaluated by asking the investigator to record any adverse event. While all adverse events have to be recorded throughout the study, only the number of SADEs possibly or securely related to the Sentus BP lead will be the basis for endpoint calculation of the SADE free rate.