Supraventricular Tachycardia Collection Study

To collect supraventricular tachycardia (SVT) data for developing and testing sensing and detection algorithms for a subcutaneous implantable cardioverter defibrillator (ICD).

The purpose of the SVT Collect study is to collect supraventricular tachycardia episode data for developing and testing new sensing and detection algorithms for a future subcutaneous ICD.

Inclusion Criteria:

• Subjects aged 18 or above, or of legal age to give consent specific to the national law of the countries in which the trial is being conducted
• Subjects indicated for implantable cardioverter defibrillator (ICD)/cardiac resynchronization therapy defibrillator (CRT-D) implant or ICD/CRT-D change-out, OR subjects indicated for an ICD/CRT-D that are undergoing ablation or electrophysiology (EP) study (including Non-invasive EP Study [NIPS])
• Subjects are willing to provide Informed Consent

Exclusion Criteria:

• Subjects who are ventricular pacing dependent
• Subjects with a preexisting dual/triple chamber pacemaker or ICD who have a history of atrioventricular (AV) block with atrial pacing < 120 beats per minute (BPM) while awake.
• Subjects who are unable to tolerate elevated ventricular rates (≥170BPM)
• Any condition which precludes the subject's ability to comply with the study requirements
• Enrollment in a concurrent study (without prior study management approval) that may confound the results of this study
• Subjects who are legally incompetent
• Subjects meet exclusion criteria required by local laws and regulations (e.g. age, breast feeding, etc).