Scott R Steele1, Matthew J Martin, Ronald J Place. 1. General Surgery Service, Department of Surgery, Madigan Army Medical Center, Fort Lewis, WA 98431, USA. scott.steele@nw.amedd.army.mil
Abstract
BACKGROUND: Endorectal ultrasound (ERUS) is an accurate method for preoperative staging of rectal cancers. Most often, a rigid 360-degree rotating probe is used. We studied whether flexible probes could attain equivalent accuracy for bowel wall penetration. METHODS: Forty-five patients were prospectively evaluated with flexible devices. Results were compared with 20 rigid and 10 flexible probe studies. To assess learning curves, we used logistic regression analysis and coefficients of correlation on accuracy data to compare ERUS accuracy with the number of examinations. RESULTS: Level of invasion was correct in 49%. Nodal examinations were correct in 78%. Learning curves leveled out at 100 examinations with 87% accuracy for the rigid probe (R = 0.46) and 77% for the flexible devices (R = 0.31). CONCLUSIONS: The coefficient of correlation for each method portends a more reliable learning curve for the rigid devices. Flexible devices were less accurate for level of invasion than the literature reported for rigid devices.
BACKGROUND: Endorectal ultrasound (ERUS) is an accurate method for preoperative staging of rectal cancers. Most often, a rigid 360-degree rotating probe is used. We studied whether flexible probes could attain equivalent accuracy for bowel wall penetration. METHODS: Forty-five patients were prospectively evaluated with flexible devices. Results were compared with 20 rigid and 10 flexible probe studies. To assess learning curves, we used logistic regression analysis and coefficients of correlation on accuracy data to compare ERUS accuracy with the number of examinations. RESULTS: Level of invasion was correct in 49%. Nodal examinations were correct in 78%. Learning curves leveled out at 100 examinations with 87% accuracy for the rigid probe (R = 0.46) and 77% for the flexible devices (R = 0.31). CONCLUSIONS: The coefficient of correlation for each method portends a more reliable learning curve for the rigid devices. Flexible devices were less accurate for level of invasion than the literature reported for rigid devices.
Authors: Jimmy C M Li; Shirley Y W Liu; Anthony W I Lo; Sophie S F Hon; Simon S M Ng; Janet F Y Lee; Ka Lau Leung Journal: Surg Endosc Date: 2010-05-13 Impact factor: 4.584
Authors: Anna Fábián; Renáta Bor; Klaudia Farkas; Anita Bálint; Ágnes Milassin; Mariann Rutka; László Tiszlavicz; Tibor Wittmann; Ferenc Nagy; Tamás Molnár; Zoltán Szepes Journal: Gastroenterol Res Pract Date: 2015-12-24 Impact factor: 2.260
Authors: Dieter Nuernberg; Adrian Saftoiu; Ana Paula Barreiros; Eike Burmester; Elena Tatiana Ivan; Dirk-André Clevert; Christoph F Dietrich; Odd Helge Gilja; Torben Lorentzen; Giovanni Maconi; Ismail Mihmanli; Christian Pallson Nolsoe; Frank Pfeffer; Søren Rafael Rafaelsen; Zeno Sparchez; Peter Vilmann; Jo Erling Riise Waage Journal: Ultrasound Int Open Date: 2019-02-05