Comparison of Fixed Tilt and Tuned Waveforms in Right-sided Implants

Current era implantable cardioverter defibrillators (ICDs) have high defibrillation efficacy.
This has stimulated a debate about whether DFT testing should be performed at all.1-3
However, this dialog has primarily centered around left sided implants, a group that is
characterized by a small incidence of high defibrillation thresholds (DFTs).

The mechanism of phase duration programming to improve DFTs would seem to be most effectively
applied to a group of patients with a high incidence of high DFTs such as right sided
implants. This study therefore aims to prospectively evaluate direct phase duration
programming on DFTs in right sided implants.

Inclusion Criteria:

- Patient meets standard indication for an ICD/ CRT-D

- Patient will be implanted with an FDA approved SJM ICD/ CRT-D that has a higher
capacitance (maximum delivered energy - 36 J)

- Pulse generator will be implanted on the right-side

- Patient is able to tolerate DFT testing.

- RV lead will be placed in the RV apex or inferior septum

Exclusion Criteria:

- Patient is pregnant.

- Patient is less than 18 years old.

- SVC coil was turned ON during DFT testing