Radiofrequency catheter ablation (RFA) is a widely used therapy for management of supravenhicular and ventricular tachycardias. Thromboembolic complications are described in about 1% of the patients undergoing RFA. The aim of the study was to analyse prothrombotic states in females with thrombotic complications after RFA with emphasis on those using oral contraceptives (OC). Methods: We retrospectively analysed data of 212 females who underwent RFA for supravenhicular and ventricular

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... s. Females were divided into two groups based on use of OC. We evaluated laboratory (in patients with thrombotic complications after RFA) and clinical risk factors of thromboemholism. Echocardiography was performed one day before and after RFA. Results: We observed thrombotic complications in 6 (2.8%) females, two in the first group (23 females with OC) and four in the second group (189 females without OC) -p=O.13. In the first group only OC was identified as a risk factor, in the second group we identified factor V Leiden mutation in one case and one female had a positive history of thromboembolic event. Four out of six thrombotic complications (free-floating thrombi in right atrium or in inferior vena can) were asymptomatic. Conclusion: Use of oral contraceptives does not seem to be a major risk factor for thrombotic complications in females who underwent RFA. Echocardiographic detection of asymptomatic thrombotic complications contributed to the higher percentage of these complications in OUT study. Preventive pre-and post-ablation anticoagulation therapy and echocardiography for screening of symptomless thrombotic complications, in patients with a positive history or with a clinical risk factors of thromboembolism, needs further discussion. piT P RIMARY OPEN COOLED TIP ABLATION OF CAVOTRICUSPID ISTHMUS