• Thomas Schimpf and Christoph Stellbrink.
• Medizinische Klinik I, Universitätslklinikum der RWTH Aachen. tschimpf@ukaachen.de
• Med Klin. 2003 Feb 15; 98 (2): 91-5.

BackgroundAtrial fibrillation is the most common arrhythmias with increasing incidence in the elderly. The increased morbidity associated with atrial fibrillation is mainly caused by cardiac emboli, mostly from the left atrial appendage, that may cause cerebral ischemic infarctions. Although electrical cardioversion of atrial fibrillation has been the standard therapy for restoration of sinus rhythm for many years, questions regarding the optimal anticoagulation for the prevention of thromboembolic complications remain unanswered.Current GuidelinesCurrent guidelines advocate the use of oral anticoagulation (adjusted to an Internal Standardized Ratio [INR] of 2.0-3.0) for at least 3-4 weeks before cardioversion for atrial fibrillation of > 48 h duration. Because of the atrial contractice dysfunction following cardioversion, the so-called "atrial stunning", anticoagulation for another 3-4 weeks after cardioversion is recommended. Alternatively, early cardioversion using high-dose intravenous heparin after exclusion of intraatrial thrombi by transesophageal echocardiography is possible, also followed by 3-4 weeks of oral anticoagulants. Because of the fear of bleeding complications, these anticoagulation schemes are frequently underused in the clinical setting, especially in older patients. Thus, new therapeutic approaches for anticoagulation in the setting of cardioversion are currently being investigated.Future PerspectivesLow molecular weight heparins allow outpatient therapy because no intravenous therapy initiation is necessary and the need for anticoagulation monitoring is reduced. Whether oral thrombin antagonists may increase the safety of chronic anticoagulation because of their higher therapeutic index compared to warfarin has to be determined in future studies.

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