The purpose of the data collection was to answer to the hypothesis that the association of D-dimer blood level and several clinical items in a new risk score could predict the absence of atrial thrombus before catheter ablation. Demographics, clinical, biological, treatment, and score data were collected. Categorical data were used for gender, clinical history, clinical condition, therapy, and diagnostic of intra-atrial thrombus. Continuous data were used for age, left ventricular ejection fraction, drug dosage, d-Dimer level, and CHADS2 score. The primary outcome was the number of patients with atrial thrombus diagnosed by transesophageal ultrasound up to 48 hours before ablation. The secondary outcomes were 1) the CHADS2 Score determined 48 hours before ablation and 2) risk Factors of atrial thrombus (variables related to the presence of atrial thrombus 48 hours before ablation). Significant risk factors were used to determine the Atrial Thrombus Exclusion (ATE) Score. The ATE score include hypertension (= 1 point), cardiac insufficiency (= 1 point), history of stoke (= 1 point) and d-dimer level >270ng/mL (= 1 point). The ATE score of zero was strongly associated with the absence of atrial thrombus.

Data were collected from medical records and laboratory results