NCT01170559

Who might be able to join this trial:

• You are 18 years of age or older
• You have a clear history of episodes where your heart suddenly starts beating very fast, with a clear start and stop, and these may come with shortness of breath or dizziness
• Your episodes of fast heartbeat stop on their own before you reach a hospital
• Your episodes happen less often than once every two weeks
• Your fast heartbeat episodes have never been recorded on a heart monitoring test (such as an ECG or a heart monitor you wear at home)
• Your resting ECG (a standard heart electrical test done while you are still) shows normal results

Who may not be able to join:

• You have a medical reason why a small heart monitor cannot be implanted under your skin — for example, you take blood thinners at a level that is too high, or you currently have an infection or fever (confirm with trial site)
• Your palpitations feel like single missed or "skipped" beats rather than episodes of fast heartbeat
• You have been diagnosed with, or are suspected to have, a serious heart valve problem or heart muscle disease
• You have an abnormal sound heard through a stethoscope when a doctor listens to your heart
• You have any abnormality shown on a standard ECG heart tracing
• You have an overactive thyroid gland (a condition called thyrotoxicosis)
• You are unwilling to have the small implantable heart monitor placed under your skin if it is offered to you

Important: Always verify eligibility with the trial site directly before applying.