Safety of cardioversion in atrial fibrillation lasting less than 48 h without post-procedural anticoagulation in patients at low cardioembolic risk.

Currently, there is no unified consensus on short-term anticoagulation after cardioversion of atrial fibrillation lasting less than 48 h in low-cardioembolic-risk patients. The aim of this study is to evaluate the rate of transient ischemic attacks, stroke and death in this subset of patients after cardioversion without post-procedural anticoagulation. In a prospective observational study, patients with recent-onset AF undergoing cardioversion attempts in the Emergency Department were evaluated over the past 3 years. Inclusion criteria were conversion to sinus rhythm, low thromboembolic risk defined by a CHA2DS2VASc score of 0-1 points for males (0-2 points for females aged over 65 years), and hospital discharge without anticoagulant treatment. Patients with severe valvular heart disease, underlying systemic causes of AF, and those discharged with anticoagulant therapy were excluded. The main outcomes measured were TIA, stroke and death at thirty days' follow-up after discharge. During the study period, 218 successful cardioversions, obtained both electrically and pharmacologically, were performed on 157 patients. One hundred and eleven patients were males (71%), the mean age was 55.2 years (±standard deviation 10.7), 99 patients (63%) reported a CHA2DS2VASc score of 0, and the remaining 58 (37%) had a risk profile of 1 point. Of these, latter 8 were females (5%) older than 65 years (risk score 2 points). At the thirty days outcome, none of the 150 enrolled patients who completed a follow-up visit has reported TIA or stroke, nor died, in the overall 211 successful cardioversions evaluated. In our study, the rate of thromboembolic events after cardioversion of recent-onset AF of less than 48 h duration, in patients with a 0-1 CHA2DS2VASc risk profile (females 0-2), appeared to be extremely low even in absence of post-procedural anticoagulation. These findings seem to confirm data from previous studies, and suggest that routine post-procedural short-term anticoagulation may be considered as an overtreatment in this very low-risk subset of patients.

Cardioversion of acute atrial fibrillation in the short observation unit: comparison of a protocol focused on electrical cardioversion with simple antiarrhythmic treatment.

BACKGROUND: Direct current cardioversion (DCC) has been shown to be effective for the management of atrial fibrillation (AF) in the emergency department (ED). Pharmacological cardioversion was compared with a strategy including DCC on patients with uncomplicated, recent-onset (<48 h) AF managed in a short observation unit (SOU). METHODS: A prospective observational study was undertaken over a period of 13 months in two institutions. A DCC-centred protocol was applied to 171 AF cases in a hospital (DCC-cohort) and pharmacological cardioversion to 151 AF cases in another hospital (P-cohort). Patients remaining in AF after 24 h were admitted. The outcomes were rate of discharge in sinus rhythm, length of stay in the ED-SOU, rate of hospitalisation and complications of treatment. Data collected were analysed according to Student t test and χ(2) statistics. RESULTS: Discharge in sinus rhythm was achieved in 159/171 cases in the DCC-cohort and 77/151 cases in the P-cohort (93% vs 51%; number needed to treat (NNT) 2.4; 95% CI 2.0 to 3.1, p<0.001), whereas mean length of stay was 7+7 h in the DCC-cohort and 9+6 h in the P-cohort (p=0.43). Eleven cases from the DCC-cohort and 67 from the P-cohort were admitted (admission rate 6% vs 44%; NNT 2.6; 95% CI 2.2 to 3.5, p<0.001). Three short-term complications occurred in the DCC-cohort and five in the P-cohort (2% vs 3%, p=0.59). Two strokes were registered in the DCC-cohort during 6-month follow-up (p undefined). CONCLUSIONS: Electrical cardioversion of recent-onset AF in the SOU is safe, effective and reduces hospitalisations. Further studies are needed to identify the most cost-effective strategy for the management of AF patients in emergency settings.