THE GIRAFFE Study: Genomic Risk Markers for Atrial Fibrillation Following Extended Cardiac Rhythm Monitoring
THE GIRAFFE Study: Genomic Risk Markers for Atrial Fibrillation Following Extended Cardiac Rhythm Monitoring
Our primary hypothesis is that a risk score comprised of approximately 10 single nucleotide
 polymorphisms (SNPs) that are associated with atrial fibrillation at the Genome Wide
 Association Study (GWAS) level is associated with the development of atrial fibrillation
 among previously undiagnosed patients at high risk for atrial fibrillation. A current example
 of these SNPs is shown in Table 1. As a secondary hypothesis, we will test the association
 between atrial fibrillation diagnosed in this study with a subset of SNPs reported to be
 associated with atrial fibrillation and with fine-mapping SNPs. We will also test the
 association between atrial fibrillation of less than and greater than 30 seconds and a panel
 of approximately 10 SNPs.
Inclusion Criteria:

 -  Symptoms of high clinical suspicion for atrial fibrillation prompting referral for
 ambulatory cardiac rhythm monitoring for potential atrial fibrillation.

 AND

 -  At high risk for atrial fibrillation, defined as any one of the following: ischemic
 stroke with no defined etiology (In prior 6 months) [3, 4, 6, 7], hypertension [33],
 increased body mass index (BMI >30kg/m2) [33], heart failure [33], clinically
 significant murmur [33], prolonged PR interval on resting ECG [33], chronic kidney
 disease [34], hypertrophic cardiomyopathy [35], congenital heart disease [36], chronic
 obstructive pulmonary disease [37, 38], sleep apnea [39-41], thyroid disease [42, 43],
 family history of atrial fibrillation [44], diabetes [45] or excess alcohol
 consumption (Male > 14 drinks/week, Female >7 drinks/week)[46].

 -  Age 40 years or older

 -  Capable of providing informed consent

 -  Capable of wearing a Zio Patch for up to 14 days

 -  Capable of providing a blood sample

 Exclusion Criteria:

 -  Previously documented atrial fibrillation or atrial flutter.

 -  Prior cardiac surgery (coronary artery bypass grafting, valve replacement or repair,
 pericardial stripping, etc) within the past 30 days.

 -  Hyperthyroidism.

 -  Have known skin allergies, conditions, or sensitivities (e.g. allergy to adhesives,
 psoriasis) as the Zio Patch should not be used on patients with known skin allergies,
 conditions, or sensitivities.

 -  Are receiving pacing therapy.

 -  Are anticipated to receive or require external cardiac defibrillation during the
 monitoring period.

 -  Are anticipated to have exposure to high frequency surgical equipment during the
 monitoring period.