What is the clinical evidence from this study?

Study design: Review. Population: Arrhythmia requiring implantable cardioverter-defibrillator. Intervention: Extravascular implantable cardioverter-defibrillator (EV-ICD) vs. Subcutaneous implantable cardioverter-defibrillator (S-ICD).

What does this research mean for the field?

Optimal non-transvenous ICD performance requires matching the specific sensing, discrimination characteristics, and complication profiles of the S-ICD or EV-ICD to the individual patient's clinical profile. Novelty: ClaimNovelty.SYNTHESIS. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To compare the sensing architectures, discrimination algorithms, therapy capabilities, procedural complications, and patient-reported outcomes between subcutaneous and extravascular implantable cardioverter-defibrillators.

September 5, 2026Current Cardiology Reports

EV-ICD and S-ICD show declining inappropriate shocks despite respective P-wave and T-wave oversensing concerns.

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Design

Review

Key result

Extravascular and subcutaneous ICDs both show declining inappropriate shock rates, though T-wave oversensing predominates in S-ICD while P-wave oversensing is the primary concern in EV-ICD.

Authors

ASA M Sugrue PFPaul Friedman

Discussion

Member takes

Overview

Declining inappropriate shocks may expand non-transvenous ICD options; leaves open head-to-head trials on long-term performance.

Key Points

To compare the sensing architectures, discrimination algorithms, therapy capabilities, procedural complications, and patient-reported outcomes between subcutaneous and extravascular implantable cardioverter-defibrillators.
Reviewed clinical data and operational mechanisms of the subcutaneous ICD (S-ICD) and extravascular ICD (EV-ICD) non-transvenous platforms.
Evaluated device-specific sensing modalities, inappropriate shock reduction algorithms, lead failure mechanisms, extraction feasibility, and quality-of-life endpoints.
Algorithmic refinements—including SMART Pass and dual-zone programming for S-ICD alongside P-wave oversensing discriminators for EV-ICD—have substantially reduced inappropriate shock rates across both platforms.
Oversensing profiles differ by anatomical placement, characterized predominantly by T-wave oversensing in S-ICD systems and P-wave oversensing in EV-ICD systems.
Patient-reported outcomes show EV-ICD is associated with higher device acceptance and fewer body-image concerns, whereas S-ICD demonstrates psychosocial outcomes comparable to transvenous systems.

Structured PICO

Intervention

Extravascular implantable cardioverter-defibrillator (EV-ICD) and Subcutaneous implantable cardioverter-defibrillator (S-ICD)

Both S-ICD and EV-ICD have improved inappropriate shock rates, but optimal performance requires matching the device's specific sensing characteristics to the patient's clinical profile.

Cite This Study

Sugrue et al. (2026) conducted a review in Arrhythmia requiring implantable cardioverter-defibrillator. Extravascular implantable cardioverter-defibrillator (EV-ICD) vs. Subcutaneous implantable cardioverter-defibrillator (S-ICD) was evaluated. Extravascular and subcutaneous ICDs both show declining inappropriate shock rates, though T-wave oversensing predominates in S-ICD while P-wave oversensing is the primary concern in EV-ICD.

synapsesocial.com/papers/6a9c01196b95aff0620ec80d https://doi.org/10.1007/s11886-026-02404-1

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September 5, 2026Current Cardiology Reports

EV-ICD and S-ICD show declining inappropriate shocks despite respective P-wave and T-wave oversensing concerns.

View Full Paper

Ask AI

Bookmark

Design

Review

Key result

Extravascular and subcutaneous ICDs both show declining inappropriate shock rates, though T-wave oversensing predominates in S-ICD while P-wave oversensing is the primary concern in EV-ICD.

Authors

ASA M Sugrue PFPaul Friedman

Discussion

Member takes

Overview

Declining inappropriate shocks may expand non-transvenous ICD options; leaves open head-to-head trials on long-term performance.

Key Points

To compare the sensing architectures, discrimination algorithms, therapy capabilities, procedural complications, and patient-reported outcomes between subcutaneous and extravascular implantable cardioverter-defibrillators.
Reviewed clinical data and operational mechanisms of the subcutaneous ICD (S-ICD) and extravascular ICD (EV-ICD) non-transvenous platforms.
Evaluated device-specific sensing modalities, inappropriate shock reduction algorithms, lead failure mechanisms, extraction feasibility, and quality-of-life endpoints.
Algorithmic refinements—including SMART Pass and dual-zone programming for S-ICD alongside P-wave oversensing discriminators for EV-ICD—have substantially reduced inappropriate shock rates across both platforms.
Oversensing profiles differ by anatomical placement, characterized predominantly by T-wave oversensing in S-ICD systems and P-wave oversensing in EV-ICD systems.
Patient-reported outcomes show EV-ICD is associated with higher device acceptance and fewer body-image concerns, whereas S-ICD demonstrates psychosocial outcomes comparable to transvenous systems.

Structured PICO

Intervention

Extravascular implantable cardioverter-defibrillator (EV-ICD) and Subcutaneous implantable cardioverter-defibrillator (S-ICD)

Both S-ICD and EV-ICD have improved inappropriate shock rates, but optimal performance requires matching the device's specific sensing characteristics to the patient's clinical profile.

Cite This Study

synapsesocial.com/papers/6a9c01196b95aff0620ec80d https://doi.org/10.1007/s11886-026-02404-1

View Full Paper

Ask AI

Bookmark