title: Factors influencing the incidence of endovenous heat-induced thrombosis (EHIT).
abstract: BACKGROUND
  Extension of thrombus from the great saphenous vein into the common femoral vein can be an early postprocedural complication of endothermal ablation (ETA).
  
  
  METHODS
  A retrospective review was performed over a 3-year period. Intraprocedural ultrasound images demonstrating the distance of the catheter tip to the saphenofemoral junction (SFJ) were available for 519 procedures, and this distance was measured.
  
  
  RESULTS
  Twenty-one (4.0%) cases of endovenous heat-induced thrombus (EHIT) were diagnosed. In all, 15 (6.4%) EHITs occurred following endovenous laser ablation and 6 (2.1%) after radiofrequency (P = .02). Distance from catheter tip to SFJ, vein diameter, concomitant treatments, and perioperative anticoagulation were not significant risk factors for EHIT. Of the clinical factors assessed, gender (P = .002), Clinical, Etiologic, Anatomic and Pathophysiologic classification 3 to 6 (P = .003), history of prior thrombosis (P = .04), and Caprini thrombosis risk factor assessment score (P = .004) were significant. On multivariate analysis, Caprini score (P = .0002) and male gender (P = .0003) remained significant.
  
  
  CONCLUSIONS
  Male gender and increased Caprini score are predictive factors for EHIT following ETA.
authors: VeinSolutions of North Suburban Boston, Stoneham, MA, USA.
authors: Soo J
authors: SJ
authors: Rhee
authors: Nancy L
authors: NL
authors: Cantelmo
authors: Mark F
authors: MF
authors: Conrad
authors: Julianne
authors: J
authors: Stoughton
mesh_terms: D000328:Adult; D000368:Aged; D001900:Boston / Q000453:epidemiology; D017115:Catheter Ablation / Q000009:adverse effects* / Q000295:instrumentation; D016009:Chi-Square Distribution; D057510:Endovascular Procedures / Q000009:adverse effects* / Q000295:instrumentation; D004867:Equipment Design; D005260:Female; D005268:Femoral Vein / Q000000981:diagnostic imaging / Q000601:surgery*; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D015994:Incidence; D053685:Laser Therapy / Q000009:adverse effects* / Q000295:instrumentation; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D012501:Saphenous Vein / Q000000981:diagnostic imaging / Q000601:surgery*; D012737:Sex Factors; D013997:Time Factors; D016896:Treatment Outcome; D014463:Ultrasonography; D014648:Varicose Veins / Q000000981:diagnostic imaging / Q000601:surgery*; D062666:Vascular Access Devices; D014689:Venous Insufficiency / Q000000981:diagnostic imaging / Q000601:surgery*; D020246:Venous Thrombosis / Q000453:epidemiology*