Key result
Phantom crosstalk in a CRT-D without an atrial lead produces misleading post-shock electrograms masking true VT.
Why the study?
Unexpected atrial-like signals after ICD shock in a patient lacking an atrial lead present a diagnostic dilemma.
Case Report (n=1)
Phantom crosstalk can cause misleading atrial-like signals on post-shock electrograms in CRT-D systems without an atrial lead, representing a diagnostic pitfall.
Answers are grounded in this paper and cite their sources.
Clinicians should suspect phantom crosstalk in post-shock atrial-like signals without atrial leads; leaves open its incidence and need for validation studies.
Unexpected atrial-like signals appearing after ICD shock in a patient without an atrial lead raise a diagnostic dilemma. In this case, a CRT-D delivered appropriate therapy for ventricular tachycardia, yet post-shock electrograms suggested an alternative mechanism. Careful analysis revealed phantom crosstalk as the source of this misleading pattern, highlighting a subtle but important pitfall in device interpretation.
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Parlavecchio et al. (2026) conducted a case report in LMNA Cardiomyopathy (n=1). CRT-D was evaluated. Phantom crosstalk in a CRT-D system without an atrial lead produced misleading post-shock electrograms that masked true ventricular tachycardia.
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