Development of an ex vivo model of endovenous laser ablation of the great saphenous vein in a pilot study1 1 Research performed at Department of Surgery, Universidade Federal do Paraná (UFPR), Curitiba-PR, Brazil. Part of PhD degree thesis, Postgraduate Program in Clinical Surgery. Tutor: Jorge Rufino Ribas Timi

Walter Junior Boim Araujo Jorge Rufino Ribas Timi Fabiano Luiz Erzinger Filipe Carlos Caron Alan Knolseisen Cambrussi About the authors

ABSTRACT

PURPOSE:

To develop an ex vivo model for the analysis of macroscopic, histological and immunohistochemical changes after experimental endovenous laser ablation (EVLA) of the great saphenous vein (GSV).

METHODS:

We describe a model produced with glass tubes and introducer sheaths to mimic the physiological conditions of EVLA procedures, such as tumescence and blood flow. A pilot study was conducted to evaluate an ex vivo procedure of EVLA of an incompetent GSV segment using a 1470-nm radial fiber diode laser (7 W power) and an automatic pull-back device. The vein segment was analyzed macroscopically and by hematoxylin & eosin staining, elastic fiber histochemistry, Gomori's trichrome staining, and alpha-smooth muscle actin immunohistochemistry.

RESULTS:

No perforations were observed macroscopically. No muscle cell adhesion was observed in the central part of the ablated vein, showing tissue disruption. There was low labeling for elastic fibers, disruption of muscle fibers, and a reduced expression of the specific marker for this cell type.

CONCLUSION:

This ex vivo endovenous laser ablation model is a low cost alternative to in vivo experiments, providing standardized experimental conditions.

Key words:
Varicose Veins; Laser Therapy; Ablation Techniques

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