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16.03.2016 | Ausgabe 11/2016

Surgical Endoscopy 11/2016

Gaze entropy reflects surgical task load

Zeitschrift:
Surgical Endoscopy > Ausgabe 11/2016
Autoren:
Leandro L. Di Stasi, Carolina Diaz-Piedra, Héctor Rieiro, José M. Sánchez Carrión, Mercedes Martin Berrido, Gonzalo Olivares, Andrés Catena
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00464-016-4851-8) contains supplementary material, which is available to authorized users.
Leandro L. Di Stasi and Carolina Diaz-Piedra have contributed equally to this work.

Abstract

Background

Task (over-)load imposed on surgeons is a main contributing factor to surgical errors. Recent research has shown that gaze metrics represent a valid and objective index to asses operator task load in non-surgical scenarios. Thus, gaze metrics have the potential to improve workplace safety by providing accurate measurements of task load variations. However, the direct relationship between gaze metrics and surgical task load has not been investigated yet. We studied the effects of surgical task complexity on the gaze metrics of surgical trainees.

Methods

We recorded the eye movements of 18 surgical residents, using a mobile eye tracker system, during the performance of three high-fidelity virtual simulations of laparoscopic exercises of increasing complexity level: Clip Applying exercise, Cutting Big exercise, and Translocation of Objects exercise. We also measured performance accuracy and subjective rating of complexity.

Results

Gaze entropy and velocity linearly increased with increased task complexity: Visual exploration pattern became less stereotyped (i.e., more random) and faster during the more complex exercises. Residents performed better the Clip Applying exercise and the Cutting Big exercise than the Translocation of Objects exercise and their perceived task complexity differed accordingly.

Conclusions

Our data show that gaze metrics are a valid and reliable surgical task load index. These findings have potential impacts to improve patient safety by providing accurate measurements of surgeon task (over-)load and might provide future indices to assess residents’ learning curves, independently of expensive virtual simulators or time-consuming expert evaluation.

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Zusatzmaterial
Supplementary material 1 (DOCX 513 kb)
464_2016_4851_MOESM1_ESM.docx
Literatur
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