Risk of Pacing-induced Cardiomyopathy

Inclusion Criteria: * Male or female ≥ 18 years * De novo DDD PM implanted at Aalborg University Hospital * PM implantation due to advanced AV block * Duration of pacemaker treatment ≥ 1 year at time of screening * Normal LVEF (≥50%) prior to PM implantation * Actively attending follow-up at the PM outpatient clinic at Aalborg University Hospital after PM implantation Exclusion Criteria: * No written informed consent * Baseline TTE not available or insufficient quality for assessment of LVEF * Contraindications to a new contrast CT if no previous contrast-enhanced cardiac CT, showing RV lead position, is available * RV pacing load \< 40%. * Deceased * Not attending follow-up at the PM outpatient clinic at Aalborg University Hospital after PM implantation * Device complications with removal of original implanted pacing lead \> 3 months after primary implantation * Subjects with severe ischemic heart disease and severe valvular heart disease. * Terminal illness or unable to provide informed consent at time of screening