If the cause of your stroke is unknown (cryptogenic), cardiac monitoring may be necessary to help determine if atrial fibrillation (AFib) is a factor.

You may be asked to wear a portable heart monitor for several days to try to identify AFib but, in some cases, a longer-term option may be needed. A recent study showed that for many cryptogenic stroke patients, it could take more than 80 days for AFib to appear because the episodes happen infrequently, often without symptoms.2

With continuous, long-term monitoring, your doctor can get information about your heart to help make a diagnosis and find the right answer for you.

Learn about the Reveal LINQ System  


  1. Liao J, Khalid Z, Scallan C, Morillo C, O’Donnell M. Noninvasive cardiac monitoring for detecting paroxysmal atrial fibrillation or flutter after acute ischemic stroke: a systematic review. Stroke 2007;38:2935–2940.
  2. Sanna T, Diener HC, Passman RS, et al. Cryptogenic Stroke and Underlying Atrial Fibrillation (CRYSTAL AF). N Engl J Med. June 26, 2014;370(26):2478-2486.