Accelerometer Sensing for Micra AV Study

Inclusion Criteria: Subject will be implanted with a MicraTM (Model MC1AVR1) for an approved indication. * Subject has history of AV block. * Subject is ≥ 18 years old and as per required local law. * Subject (and/or witness as applicable per local regulations) provides signed and dated authorization and/or consent per institution and local requirements. * Subject is willing and able to comply with the protocol. Exclusion Criteria: * Subject currently enrolled or planning to participate in a potentially confounding drug or device trial during the study. Co-enrollment in concurrent trials is only allowed when documented pre-approval is obtained from the Medtronic Clinical Research Specialist. * Subject implanted with a MicraTM (Model MC1AVR1) on a non-permanent basis (e.g. CIED infection). * Subject is pregnant (if required by local law, women of child-bearing potential must undergo a pregnancy test within seven days prior to MicraTM Model MC1AVR1 implant procedures). * Subject meets any exclusion criteria required by local law (age or other).