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Influence of Intraoperative Neuromonitoring on Surgeons’ Technique During Thyroidectomy

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Abstract

Background

When assessing the value of intraoperative nerve monitoring (IONM) during routine thyroidectomy, it is necessary to consider its influence on the surgeon’s dissection technique. We investigated the effect of IONM on individual surgeon performance by determining the learning curve associated with this tool.

Methods

A one-year prospective study was conducted between May 2008 and April 2009 within a team of three experienced endocrine surgeons. The measure of surgical performance was based on the detection of immediate postoperative recurrent laryngeal nerve palsy by laryngoscopy. Individual learning curves associated with IONM acquisition were drawn with the cumulative sum (CUSUM) chart. Each surgeon was questioned about possible changes he had experienced in his own surgical technique after the introduction of IONM.

Results

A total of 475 consecutive patients who underwent thyroid surgery with IONM were included. The pattern of learning curves varied among surgeons and ranged from 35 to 304 procedures required for complete IONM acquisition. The surgeon with the longest learning curve also described a drastic modification of his technique related to nerve dissection.

Conclusions

Intraoperative nerve monitoring can induce changes in surgical practice. The different learning curve patterns among surgeons may reflect the variable degree to which surgeons will modify their own dissection technique. Such an effect on learning must be considered when assessing the impact of using IONM on patient safety.

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Acknowledgments

The authors are grateful to David J. Biau (Service de Chirurgie Orthopédique et Traumatologique, Hôpital Cochin, Paris, France) for helpful contributions in designing the LC-CUSUM chart (Fig. 2). The authors are also grateful to Philippe Messy for extracting the study data from the hospital information system, and Sandrine Touzet for participating in the critical revision of the manuscript (Hospices Civils de Lyon, Pôle Information Médicale Evaluation Recherche, Lyon, France).

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Correspondence to Antoine Duclos.

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Duclos, A., Lifante, JC., Ducarroz, S. et al. Influence of Intraoperative Neuromonitoring on Surgeons’ Technique During Thyroidectomy. World J Surg 35, 773–778 (2011). https://doi.org/10.1007/s00268-011-0963-4

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