The primary endpoint for this study was the percentage of occluded venous segments at the 6-month follow-up. Extension of the occluded saphenous vein segment was measured at each visit through a tape guided by ultrasound to determine occlusion points. A segment was considered patent if it was compressible and with reflux after muscle compression in a standing position. The length of the occluded vein segment was compared with the length of the segment where thermal ablation was performed, thus allowing us to calculate the segment closure percentage. Secondary end-points were the presence of ecchymosis, induration, paresthesia, skin burns and deep vein thrombosis.