Experimental evaluation of accuracy of radiofrequency ablation using conventional ultrasound or a third-dimension navigation tool.

Autor: Stippel DL; Department of Visceral and Vascular Surgery, University of Cologne, Joseph-Stelzmann-Strasse 9, Germany. Dirk.Stippel@uni-koeln.de, Böhm S, Beckurts KT, Brochhagen HG, Hölscher AH
Jazyk: angličtina
Zdroj: Langenbeck's archives of surgery [Langenbecks Arch Surg] 2002 Nov; Vol. 387 (7-8), pp. 303-8. Date of Electronic Publication: 2002 Oct 19.
DOI: 10.1007/s00423-002-0315-9
Abstrakt: Background: Successful radiofrequency-induced ablation is dependent on correct placement of the device. The ultraguide system is a three-dimensional positioning system creating an overlay of the real-time ultrasound image and a virtual image of the device.
Methods: Tumor mimics were produced by injecting an agarose/cellulose/glycerol gel into pig livers on table. The precision of device placement was evaluated either using a freehand ultrasound procedure or using the aid of the ultraguide system either by an experienced or inexperienced surgeon. Tumor mimics were ablated by a protocol yielding an ablation only discretely larger than the mimics to enhance the importance of precise positioning.
Results: The sizes of the 40 tumor mimics were: largest diameter 14.1+/-2.2 mm, volume 0.89+/-0.40 cm(3). The largest diameter of ablation was 25.6+/-3.7 mm, the smallest diameter 21.9+/-2.9 mm, and the volume 7.20+/-2.38 cm(3). The experienced surgeon was successful in 7 of 10 cases with and without the ultraguide, the inexperienced surgeon in 4 of 10 without and 7 of 10 with the ultraguide.
Conclusions: The ultraguide system may facilitate precise device placement for the less experienced surgeon. It seems worthwhile to evaluate a possible benefit of the system during placement of devices under operating room conditions.
Databáze: MEDLINE
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