Safety and Efficacy Study of an A1-Adenosine Receptor Agonist to Slow Heart Rate in Atrial Fibrillation

Inclusion Criteria * Primary diagnosis of atrial fibrillation with rapid ventricular response of any duration as documented by an ECG Exclusion Criteria * Presence of other significant cardiac disease or history of significant neurological, hepatic,cardiovascular, renal, gastrointestinal, thyroid, respiratory, rheumatologic, or hematologic disease or impairment that in the investigator's judgment is serious enough to preclude the patient from safely participating in the study