Pacemaker dependency after transcatheter aortic valve implantation with the self-expanding medtronic core valve system

Background/objectives: To determine pacemaker (PM) dependency at follow-up visit in patients who underwent new permanent pacemaker implantation (PPI) following transcatheter aortic valve implantation (TAVI). Methods: Single center prospective observational study including 167 patients without previous PM implantation who underwent TAVI with the self-expanding Medtronic CoreValve System (MCS) between November 2005 and February 2011. PM dependency was defined by the presence of a high degree atrioventricular block (HDAVB; second [AV2] and third degree [AV3B]), or a slow (b30 bpm) or absent ventricular escape rhythm during follow-up PM interrogation. Results: A total of 36 patients (21.6%) received a newPMfollowing TAVI. The indication for PMwas AV2B (n=2, 5.6%), AV3B (n=28, 77.8%), postoperative symptomatic bradycardia (n=3, 8.3%), brady-tachy syndrome (n= 1, 2.8%), atrial fibrilation with slow response (n=1, 2.8%) and left bundle branch block (n=1, 2.8%). Long term follow-upwas complete for all patients and ranged from1 to 40 months (median (IQR): 11.5 (5.0-18.0 months). Of those patientswith a HDAVB, 16 out of the 30 patients (53.3%)were PMindependent at follow-up visit (complete or partial resolution of the AV conduction abnormality). Overall, 20 out of the 36 patients (55.6%) who received a new PM following TAVI were PM independent at follow-up. Conclusion: Partial and even complete resolution of peri-operative AV conduction abnormalities after MCS valve implantation occurred in more than half of the patients.

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