Purpose of Technology:

Despite extensive clinical evaluation, the mechanism of syncope (transient loss of consciousness) remains unexplained in a large portion of patients. Implantable cardiac loop recorders (ILRs) are small, battery-operated, electrocardiogram (ECG) monitors, inserted during a minor surgical procedure that evaluates patients with recurrent syncope of unknown origin for underlying arrhythmias. IRLs can record a patient’s heart rhythm for up to 36 months. This feature enables detection of infrequent syncopal symptoms, which may only occur once every several months.

Relevant Questions:

  • Do ILRs provide a more accurate and timely diagnosis in patients with recurrent, unexplained syncope compared with other diagnostic modalities (e.g., standard ECG, external loop recorder, etc.)?

  • Do ILRs provide information that improves treatment decision making and health outcomes (e.g., reduction in syncope recurrence, falls and fall-related injuries, sudden death)?

  • Are ILRs safe for assessment of patients experiencing syncope?

  • Have definitive patient selection criteria been established for use of an ILR for diagnosis of syncope?


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