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Updated: Jan 17, 2026
A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Evaluation of subcutaneous implantable cardioverter defibrillator eligibility in ventricularly paced patients during
Georgios Leventopoulos1, Kornilia Pepa2, Kassiani-Maria Nastouli2
1Department of Cardiology, University Hospital of Patras, Patras, 26504, Greece. levent2669@gmail.com.
Background And Purpose:
T-wave oversensing is the leading cause of inappropriate shocks in subcutaneous ICDs (S-ICDs). This study assessed S-ICD eligibility in ventricularly paced patients using automated screening at rest and during exercise.
Methods:
Fifty patients with a dual-chamber pacemaker or ICD, or a cardiac resynchronization therapy device (CRT), and paced QRS complexes were screened. Eligibility was defined as at least one acceptable sensing vector at rest (supine and standing) and during treadmill exercise at 100 bpm.
Results:
Mean age was 72.4 ± 9 years, 80% male. Of the 50 patients (46 patients (92%) had dual-chamber and 4 CRT devices), 17 (34%) passed screening at rest, but only 8 (16%) remained eligible during exercise. Right ventricular (RV) lead position and electrocardiographic (ECG) features showed no significant impact.
Conclusion:
S-ICD eligibility is low among paced patients, and exercise further reduces suitability. Unlike non-paced patients, screening in this group should routinely include exercise evaluation.
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