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Vasc Endovascular Surg. 2013 Apr;47(3):207-12. doi: 10.1177/1538574413478494. Epub 2013 Feb 20.

Factors influencing the incidence of endovenous heat-induced thrombosis (EHIT).

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  • 1VeinSolutions of North Suburban Boston, Stoneham, MA, USA.



Extension of thrombus from the great saphenous vein into the common femoral vein can be an early postprocedural complication of endothermal ablation (ETA).


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.


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.


Male gender and increased Caprini score are predictive factors for EHIT following ETA.

[PubMed - indexed for MEDLINE]
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