Construct validity testing of a laparoscopic surgery simulator (Lap Mentor): evaluation of surgical skill with a virtual laparoscopic training simulator.

Department of Surgery and Surgical Oncology, Charite Universitätsmedizin Berlin, Berlin, Germany.
Surgical Endoscopy (Impact Factor: 3.43). 07/2008; 22(6):1440-4. DOI: 10.1007/s00464-007-9625-x
Source: PubMed

ABSTRACT Before surgical simulators can be implemented for assessment of surgical training, their construct validity should be assessed.
Nine novices (NOV), nine medical students (MS), and nine residents (RES) underwent a laparoscopic skills training on the virtual reality (VR) simulator Lap Mentor. Assessment of laparoscopic skill was based on parameters measured by the computer system before and after training.
Significant difference existed between RES and NOV at seven of nine tasks before training on the VR simulator. After the training in some tasks significant differences were observed between the experienced group (RES) and the nonexperienced groups (MS and NOV) or between medical groups (RES and MS) and nonmedical group (NOV).
Performance parameters of the Lap-Mentor can be used to distinguish between subjects with varying laparoscopic experience.

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    ABSTRACT: Objective The objective of this trial was to assess which type of warm-up has the highest effect on virtual reality (VR) laparoscopy performance. The following warm-up strategies were applied: a hands-on exercise (group 1), a cognitive exercise (group 2), and no warm-up (control, group 3). Design This is a 3-arm randomized controlled trial. Setting The trial was conducted at the department of surgery of the University Hospital Basel in Switzerland. Participants A total of 94 participants, all laypersons without any surgical or VR experience, completed the study. Results A total of 96 participants were randomized, 31 to group 1, 31 to group 2, and 32 to group 3. There were 2 postrandomization exclusions. In the multivariate analysis, we found no evidence that the intervention had an effect on VR performance as represented by 6 calculated subscores of accuracy, time, and path length for (1) camera manipulation and (2) hand-eye coordination combined with 2-handed maneuvers (p = 0.795). Neither the comparison of the average of the intervention groups (groups 1 and 2) vs control (group 3) nor the pairwise comparisons revealed any significant differences in VR performance, neither multivariate nor univariate. VR performance improved with increasing performance score in the cognitive exercise warm-up (iPad 3D puzzle) for accuracy, time, and path length in the camera navigation task. Conclusions We were unable to show an effect of the 2 tested warm-up strategies on VR performance in laypersons. We are currently designing a follow-up study including surgeons rather than laypersons with a longer warm-up exercise, which is more closely related to the final task.
    Journal of Surgical Education 09/2014; · 1.63 Impact Factor


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