Pre-Tachyarrhythmia Practice Exam

After cardioversion, the risk of thromboembolism can persist because thrombi may have formed during atrial fibrillation and the atrial myocardium can stay functionally abnormal (stunned) for weeks. If the AF has lasted more than 48 hours or the duration is unknown, stopping anticoagulation right away would leave a window of high stroke risk during the period when the heart rhythm has just been restored but the atrial’recovery isn’t complete. The recommended approach is to continue anticoagulation for at least three weeks after cardioversion in these cases, and to consider using a transesophageal echocardiogram to look for left atrial thrombus and guide further decisions about stopping anticoagulation. This reflects the principle that rhythm control does not immediately eliminate embolic risk, so protection with anticoagulation is still needed in the early post-cardioversion period.