Does Eliminating Coffee Avoid Fibrillation?

Inclusion Criteria: * Men or women ≥ 21 years of age * Sustained AF or atrial flutter (provided patient has a history of AF) * Planned/scheduled direct current electrical cardioversion * Consumption greater than or equal to one cup of coffee per day sometime in the past 5 years * Willing and able to comply with coffee abstinence or continuation for at least 6 months * Life expectancy of at least 6 months * Willing and able to return and comply with scheduled phone follow up visits * Willing and able to provide written informed consent Exclusion Criteria: * Established allergy or adverse reaction to coffee * Stated inability to comply with coffee abstinence or continuation * AF ablation in preceding 3 months or planned in next 3 months * Recent cardiothoracic surgery in preceding 3 months * Pregnancy or desire to get pregnant within next 6 months. * Current enrollment in an investigation or study of a cardiovascular device or investigational drug that would interfere with this study * Any other criteria, which would make the patient unsuitable to participate in this study as determined by the Principal Investigator (e.g., an uncontrolled drug and/or alcohol addiction)