Highlights
- •Preliminary studies demonstrated that subcutaneous implantable cardioverter defibrillator (S-ICD) can effectively treat ventricular arrythmias in patients with arrhythmogenic cardiomyopathy (ACM) despite relatively high inappropriate shocks (IS) mostly due to T-wave oversensing (TWOS) and device-related complications.
- •Data on the potential advantages of combining the third-generation S-ICD with modern software upgrade and the intermuscular (IM) two-incision implantation technique in ACM with different phenotypic variants are lacking.
- •According to our findings, although the third-generation S-ICD implanted with the IM two-incision technique appears to be associated with a low risk of device-related complications and IS due to TWOS, the risk of IS due to myopotential should be considered.
Abstract
Background
Long-term data on the potential advantages of combining the third-generation subcutaneous
implantable cardioverter defibrillator (S-ICD) with modern software upgrade including
the “SMART Pass”, modern programming strategies and the intermuscular (IM) two-incision
implantation technique in arrhythmogenic cardiomyopathy (ACM) with different phenotypic
variants are lacking. In this study we evaluated the long-term outcome of patients
with ACM who underwent third-generation S-ICD (Emblem, Boston Scientific) and IM two-incision
technique.
Methods
The study population included 23 consecutive patients [70% male, median age 31 (24–46)
years] diagnosed with ACM with different phenotypic variants who received third-generation
S-ICD implantation with the IM two-incision technique.
Results
During a median follow-up of 45.5 months [16–65], 4 patients (17.4%) received a at
least one inappropriate shock (IS), with median annual event rate of 4.5%. Extra-cardiac
oversensing (myopotential) during effort represented the only cause of IS. No IS due
to T-wave oversensing (TWOS) were recorded. Only one patient (4.3%) experienced device-related
complication consisting of premature cell battery depletion requiring device replacement.
No device explantation because of need for anti-tachycardia pacing or ineffective
therapy occurred. There was no significant difference between patients who did and
did not experienced IS with regard to baseline clinical, ECG and technical characteristics.
Five patients (21.7%) received appropriate shocks on ventricular arrythmias.
Conclusions
According to our findings, although the third-generation S-ICD implanted with the
IM two-incision technique appears to be associated with a low risk of complications
and IS due to cardiac oversensing, the risk of IS due to myopotential mainly during
effort should be considered.
Keywords
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Article info
Publication history
Published online: April 12, 2023
Accepted:
April 11,
2023
Received in revised form:
April 7,
2023
Received:
March 13,
2023
Footnotes
☆All authors take responsibility for all aspects of the reliability and freedom from bias of the data presented and their discussed interpretation.
Identification
Copyright
© 2023 Elsevier B.V. All rights reserved.