Abstract
OBJECTIVES: The study sought to describe the concept of algorithm-based screening with an external subcutaneous implantable cardioverter-defibrillator (S-ICD) to evaluate sensing using the rhythm discrimination algorithm of the device.
BACKGROUND: In a proportion of patients, screening for S-ICD therapy with the dedicated screening tool results in false negative and false positive results.
METHODS: Both patients who failed the standard screening and who passed with abnormal baseline ECGs were screened with an external S-ICD to evaluate sensing at rest and during exercise in all 3 sensing vectors (algorithm-based screening). Patients with adequate sensing were implanted with an S-ICD. Follow-up data regarding (in)appropriate shocks was collected.
RESULTS: Algorithm-based screening was performed in 15 patients. Group 1 consists of 8 who failed standard screening and Group 2 consists of 7 who passed and had abnormal ECGs. Six of 8 who failed standard screening in all sensing vectors demonstrated adequate sensing with the external S-ICD and were implanted with an S-ICD. Of these 6 implanted patients in Group 1, 1 inappropriate shock was observed duration median of 17 months' follow-up and 2 episodes of ventricular fibrillation were successfully treated. Of the 7 patients in Group 2, who passed standard screening, 2 demonstrated inadequate sensing during additional screening with the external S-ICD. No appropriate or inappropriate shocks were observed in Group 2 during 10 months' follow-up.
CONCLUSIONS: Algorithm-based screening with the external S-ICD may improve patient selection and reduce the number of false positive and false negative screening results of the standard screening method.
Original language | English |
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Pages (from-to) | 605-614 |
Number of pages | 10 |
Journal | JACC. Clinical electrophysiology |
Volume | 2 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2016 |