Pacemaker Utilization and Ventricular Pacing in Patients Undergoing Trans-catheter Aortic Valve Replacement (TAVR)

Development of atrioventricular (AV) conduction system abnormalities requiring placement of a
permanent pacemaker (PPM) is a known complication of transcatheter aortic valve replacement
(TAVR). Male gender, pre-existing AV conduction system abnormalities, transient AV block
intra-procedurally, and use of a self-expanding valve have all been associated with increased
risk of AV block and need for permanent pacemaker placement. Persistent AV conduction
abnormalities have been documented in approximately 15% of patients who receive an Edwards
Sapien valve, with 4% requiring permanent pacemaker placement. 22-28% of patients who receive
a CoreValve require permanent pacemaker placement in some studies. In one study, 78% of
patients who underwent His bundle electrogram assessment during CoreValve placement had
transient or persistent AV conduction system abnormalities during the procedure.

Pacemakers placed at The Heart Hospital Baylor Plano are produced by two manufactures:
Medtronic, Inc. and St. Jude Medical, Inc. Each of these manufacturers have pacemakers with
algorithms designed to minimize right ventricular pacing. Medtronic's algorithm is referred
to as "MVP" (Managed Ventricular Pacing), and St. Jude Medical's algorithm is referred to as
"VIP" (Ventricular Intrinsic Preference). Each of these techniques purports to reduce
unnecessary right ventricular (RV) pacing through a novel pacemaker algorithm. Both
manufacturers' pacemaker programmers and remote monitoring systems allow for demonstration of
the percentage of ventricular pacing performed by the device.

The Investigators propose to assess the 90 day- ventricular pacing, atrioventricular block
(AVB), intraventricular conduction delay (IVCD), bundle branch block (BBB), and rate
histogram incidence in those patients who undergo pacemaker implantation due to elevated risk
(or occurrence of) high-grade AV block after TAVR.

Inclusion Criteria:

- Patients > 18 years of age

- Patients undergoing Transcatheter Aortic Valve Replacement

- Indication for PPM including:

1. Persistent 3rd degree AVB

2. Transient 3rd degree AVB

3. New Left BBB

4. New bifascicular block

5. New first degree AV block

6. Any conduction disturbance determined by the investigator to be related to the
TAVR procedure 4. Patients receiving post-TAVR PPM with one of the following
devices

a. Medtronic: i. ADAPTA DR -ADDR01 ii. ADAPTA L DR-ADDRL1 iii. ADVISA MRI-A2DR01 b.
St. Jude Medical: i. Zypher 5820 ii. Zypher 5826 iii. Accent pm2110 iv. Accent pm2210
v. Assurity pm2240 vi. Endurity Pm2160

Exclusion Criteria:

- Pregnancy-Women of childbearing potential should have negative urine 'pregnancy test
prior to enrollment

- Patients with implanted pacemaker

- Patients with implantable cardiac defibrillator

- Indication for post TAVR PPM not related to the procedure including sinus node
dysfunction/sick sinus syndrome.

- Medically unable to provide consent