title: Risk factors for endovenous heat-induced thrombosis after endovenous radiofrequency ablation performed in Thailand.
abstract: OBJECTIVE
  We aimed to determine the incidence of and associated risk factors for endovenous heat-induced thrombosis (EHIT) after endovenous radiofrequency ablation (RFA).
  
  
  METHODS
  We retrospectively reviewed the medical records of 82 patients with 97 great saphenous veins undergoing RFA from 2012 to 2014.
  
  
  RESULTS
  The incidence of EHIT was 10.3%. Class 1, 2, and 3 EHIT was found in 50%, 30%, and 20% of legs, respectively. No class 4 EHIT, deep vein thrombosis, or pulmonary emboli occurred. Univariate analysis revealed that the associated risk factors for EHIT were a vein diameter of >10 mm, operative time of >40 min, and Caprini score of >6. Multivariate analysis revealed that the independent risk factors associated with EHIT were a vein diameter of >10 mm and operative time of >40 min.
  
  
  CONCLUSIONS
  A vein diameter of >10 mm and operative time of >40 min might be predictive factors for EHIT following RFA.
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand nuttawut@gmail.com.
authors.forename: Nuttawut
authors.initials: N
authors.lastname: Sermsathanasawadi
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Tsz Yin
authors.initials: TY
authors.lastname: Voravitvet
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Khamin
authors.initials: K
authors.lastname: Chinsakchai
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Chumpol
authors.initials: C
authors.lastname: Wongwanit
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Chanean
authors.initials: C
authors.lastname: Ruangsetakit
authors.affiliation: Division of Vascular Surgery, Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Pramook
authors.initials: P
authors.lastname: Mutirangura
mesh_terms: D000368:Aged; D017115:Catheter Ablation / Q000009:adverse effects*; D005260:Female; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology*; D011655:Pulmonary Embolism / Q000453:epidemiology / Q000209:etiology; D012189:Retrospective Studies; D012307:Risk Factors; D012501:Saphenous Vein / Q000378:metabolism*; D013785:Thailand; D020246:Venous Thrombosis / Q000453:epidemiology / Q000209:etiology
keywords: Endovenous heat-induced thrombosis; endothermal ablation; radiofrequency ablation; varicose veins; venous insufficiency