What does this research mean for the field?

The Automatic Gain Control algorithm in Boston Scientific ICDs can inappropriately elevate the sensing threshold following high-amplitude ventricular signals, leading to undersensing of ventricular fibrillation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The study aims to explore failures in the sensing algorithm of ICDs that may prevent effective ventricular fibrillation treatment.

June 24, 2026HeartRhythm Case ReportsOpen Access

When Automatic Gain Control Fails: Ventricular Fibrillation Undersensing in the Setting of High-Amplitude Ventricular Signals

Q: What is the clinical evidence from this study?

Study design: Other. Population: Ventricular fibrillation. Intervention: Automatic Gain Control (AGC) algorithm in Boston Scientific ICDs. Primary outcome: Ventricular fibrillation undersensing.

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Key result

Automatic Gain Control in Boston Scientific ICDs may cause VF undersensing after high-amplitude signals.

Why the study?

Does the Automatic Gain Control (AGC) algorithm in Boston Scientific ICDs lead to ventricular fibrillation undersensing in the setting of high-amplitude ventricular signals?

Population

Patients with Boston Scientific implantable cardioverter-defibrillators (ICDs)

Design

Case_report

Authors

JSJurgen ShtembariElectrophysiology DSDhan Bahadur ShresthaGeneral Cardiology HYHirad YarmohammadiElectrophysiology

Discussion

Member takes

Implication

Raises caution for rare VF undersensing with AGC in Boston Scientific ICDs; hypothesis-generating case report requiring further study.

Key Points

The study aims to explore failures in the sensing algorithm of ICDs that may prevent effective ventricular fibrillation treatment.
Analyzed the performance of Boston Scientific ICDs employing an Automatic Gain Control algorithm.
Investigated conditions under which AGC may inadequately adjust ventricular sensitivity.
AGC may increase the sensing threshold improperly, resulting in undetected low-amplitude VF signals.
Documented instances where therapy delivery was missed due to sensing failures during high-amplitude signals.

Structured PICO

Does the Automatic Gain Control (AGC) algorithm in Boston Scientific ICDs lead to ventricular fibrillation undersensing in the setting of high-amplitude ventricular signals?

Population

Patients with Boston Scientific implantable cardioverter-defibrillators (ICDs)

Intervention

Boston Scientific Automatic Gain Control (AGC) algorithm

Outcome

Ventricular fibrillation undersensingsafety

The Automatic Gain Control algorithm in Boston Scientific ICDs can rarely fail by inappropriately increasing the sensing threshold after high-amplitude signals, leading to potentially fatal undersensing of ventricular fibrillation.

Cite This Study

Shtembari et al. (2026) studied Ventricular fibrillation. Automatic Gain Control (AGC) algorithm in Boston Scientific ICDs was evaluated on Ventricular fibrillation undersensing. The Automatic Gain Control algorithm in Boston Scientific ICDs may inappropriately increase the sensing threshold after high-amplitude signals, causing undersensing of ventricular fibrillation.

synapsesocial.com/papers/6a3c2375d15afadd906fa306 https://doi.org/10.1016/j.hrcr.2026.06.019

Topics

Cardiac device therapy

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When Automatic Gain Control Fails: Ventricular Fibrillation Undersensing in the Setting of High-Amplitude Ventricular Signals

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Topics

When Automatic Gain Control Fails: Ventricular Fibrillation Undersensing in the Setting of High-Amplitude Ventricular Signals

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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