The WATCHMANTM may be right for patients who have atrial fibrillation not caused by a heart valve problem (also known as non-valvular AFib), have been recommended for blood thinning medicines by their doctor, and can take anticoagulant medications but need an alternative.  In 2017, CMC began a trial that also tests the effectiveness of the WATCHMANTM in patients who have no tolerance for blood thinners.