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Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle

BACKGROUND: For accuracy in navigated transcranial magnetic stimulation (nTMS), determination of the hotspot location of small hand muscles is crucial because it is the basis for the resting motor threshold (RMT) and, therefore, its spatial resolution. We investigated intra- and interobserver differ...

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Autores principales: Sollmann, Nico, Hauck, Theresa, Obermüller, Thomas, Hapfelmeier, Alexander, Meyer, Bernhard, Ringel, Florian, Krieg, Sandro M
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774221/
https://www.ncbi.nlm.nih.gov/pubmed/24006839
http://dx.doi.org/10.1186/1471-2202-14-94
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author Sollmann, Nico
Hauck, Theresa
Obermüller, Thomas
Hapfelmeier, Alexander
Meyer, Bernhard
Ringel, Florian
Krieg, Sandro M
author_facet Sollmann, Nico
Hauck, Theresa
Obermüller, Thomas
Hapfelmeier, Alexander
Meyer, Bernhard
Ringel, Florian
Krieg, Sandro M
author_sort Sollmann, Nico
collection PubMed
description BACKGROUND: For accuracy in navigated transcranial magnetic stimulation (nTMS), determination of the hotspot location of small hand muscles is crucial because it is the basis for the resting motor threshold (RMT) and, therefore, its spatial resolution. We investigated intra- and interobserver differences of hotspot mapping to provide evidence for the reproducibility of this method. Ten subjects underwent nTMS motor mapping of the hotspot for the abductor pollicis brevis muscle (APB) three times. The first two sessions were performed by the same examiner; the third mapping was performed by a different examiner. Distances between the first and second mappings (intraobserver variability) and between the second and third mappings (interobserver variability) were measured. RESULTS: Intraobserver variability had a mean of 8.1 ± 3.3 mm (limits of agreement (LOA) 1.7 to 14.6 mm), whereas mean interobserver variability was 10.3 ± 3.3 mm (LOA 3.8 to 16.7 mm). Concerning RMT, CCC was 0.725 (95% CI: 0.276; 0.914). The mean variability in the same cortical depth was measured as 5.7 ± 3.3 mm (LOA −0.7 to 12.2 mm) for intraobserver and 9.2 ± 3.3 mm (LOA 2.7 to 15.8 mm) for interobserver examinations. When evaluating the RMT, CCC was 0.709 (95% CI: 0.244; 0.909). CONCLUSIONS: Overall, intraobserver variability showed higher reliability than interobserver variability. Our findings show that we can achieve good reliability in hotspot determination, ranging within the calculated precision of the system.
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spelling pubmed-37742212013-09-17 Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle Sollmann, Nico Hauck, Theresa Obermüller, Thomas Hapfelmeier, Alexander Meyer, Bernhard Ringel, Florian Krieg, Sandro M BMC Neurosci Research Article BACKGROUND: For accuracy in navigated transcranial magnetic stimulation (nTMS), determination of the hotspot location of small hand muscles is crucial because it is the basis for the resting motor threshold (RMT) and, therefore, its spatial resolution. We investigated intra- and interobserver differences of hotspot mapping to provide evidence for the reproducibility of this method. Ten subjects underwent nTMS motor mapping of the hotspot for the abductor pollicis brevis muscle (APB) three times. The first two sessions were performed by the same examiner; the third mapping was performed by a different examiner. Distances between the first and second mappings (intraobserver variability) and between the second and third mappings (interobserver variability) were measured. RESULTS: Intraobserver variability had a mean of 8.1 ± 3.3 mm (limits of agreement (LOA) 1.7 to 14.6 mm), whereas mean interobserver variability was 10.3 ± 3.3 mm (LOA 3.8 to 16.7 mm). Concerning RMT, CCC was 0.725 (95% CI: 0.276; 0.914). The mean variability in the same cortical depth was measured as 5.7 ± 3.3 mm (LOA −0.7 to 12.2 mm) for intraobserver and 9.2 ± 3.3 mm (LOA 2.7 to 15.8 mm) for interobserver examinations. When evaluating the RMT, CCC was 0.709 (95% CI: 0.244; 0.909). CONCLUSIONS: Overall, intraobserver variability showed higher reliability than interobserver variability. Our findings show that we can achieve good reliability in hotspot determination, ranging within the calculated precision of the system. BioMed Central 2013-09-05 /pmc/articles/PMC3774221/ /pubmed/24006839 http://dx.doi.org/10.1186/1471-2202-14-94 Text en Copyright © 2013 Sollmann et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Sollmann, Nico
Hauck, Theresa
Obermüller, Thomas
Hapfelmeier, Alexander
Meyer, Bernhard
Ringel, Florian
Krieg, Sandro M
Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title_full Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title_fullStr Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title_full_unstemmed Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title_short Inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
title_sort inter- and intraobserver variability in motor mapping of the hotspot for the abductor policis brevis muscle
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774221/
https://www.ncbi.nlm.nih.gov/pubmed/24006839
http://dx.doi.org/10.1186/1471-2202-14-94
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