Tremor and Other Hyperkinetic Movements

In Response To:

Frucht SJ. Focal task-specific dystonia—from early descriptions to a new, modern formulation. Tremor Other Hyperkinet Mov. 2014; 4. doi: 10.7916/D8VD6WHP
ABSTRACT | HTML | PDF | XML | ePUB

Letters

Focal Task-specific Dystonia among Professional Musicians in Latin America

Emilia Gatto1,2*, Anabel Chade3,4, Gabriel Persi2, Virginia Parisi2, Ana Ayarza2, Miguel Campuzano2 & Silvia García3

1Department of Movement Disorders, Instituto Neurociencias de Buenos Aires (INEBA), Buenos Aires, Argentina, 2Sanatorio de la Trinidad Mitre, Buenos Aires, Argentina, 3Institute of Cognitive Neurology (INECO) and Institute of Neuroscience, Favaloro University, Buenos Aires, Argentina, 4UDP-INECO Foundation Core on Neuroscience (UIFCoN), Diego Portales University, Santiago, Chile

Keywords: Musicians, dystonia, focal dystonia

Citation: Gatto E, Chade A, Persi G, et al. Focal task-specific dystonia among professional musicians in Latin America. Tremor Other Hyperkinet Mov. 2015; 5. doi: 10.7916/D8XS5T5D

*To whom correspondence should be addressed. E-mail: emiliagatto@fibertel.com.ar; Ga_mem@yahoo.com

Editor: Elan D. Louis, Yale University, USA

Received: December 31, 2014 Accepted: January 13, 2015 Published: February 3, 2015

Copyright: © 2015 Gatto et al. This is an open-access article distributed under the terms of the Creative Commons Attribution–Noncommercial–No Derivatives License, which permits the user to copy, distribute, and transmit the work provided that the original author(s) and source are credited; that no commercial use is made of the work; and that the work is not altered or transformed.

Funding: None.

Financial Disclosures: None.

Conflict of Interest: The authors report no conflict of interest.

To the Editor:

We read with great interest the article “Focal Task-specific Dystonia—From Early Descriptions to a New, Modern Formulation” by Frucht.1

The author presented a new working conceptual model of focal task-specific dystonia (FTSD) attempting to integrate phenomenology, physiology, and treatment. Nevertheless, several aspects of FTSD remain unresolved, and the author suggests that international working groups focusing on musician's dystonia (MD) could contribute to better understanding in the field.

The estimated prevalence of FTSD is 0.5–1% for all professional musicians, although there is wide variation in different populations and in the type of instrument played.25

To investigate the data available from our region, we conducted a systematic search of MD in Latin America. The Medline, EMBASE, and LILACS databases were explored using the subject terms musician's dystonia Latin America, focal dystonia Latin America, and prevalence studies of FTSD in highly skilled musicians from Latin America. We searched for articles in English and in Spanish. Data from Latin American countries about MD are scarce, and only isolated reports or small series of cases were found in the English literature.610

Recently, Aranguiz et al.,6 from Chile, described clinical and demographic characteristics of 12 musicians who developed dystonia. According to the literature, the authors found male predominance (83.3%): eight patients were classical musicians; the hand was the most affected segment (91.7%); and interestingly they described a positive family history of neurological diseases in first-degree relatives in 50% of their patients.

In our country, Argentina, we failed to find extensive epidemiological information concerning MD affecting professional musicians. In previous years, we had conducted a survey in an attempt to estimate the prevalence of FTSD among professional musicians in a community-based study from Argentina.11 Professional musicians from different orchestras in Buenos Aires were invited to complete a confidential and anonymous self-assessment questionnaire that included demographic, epidemiological, and clinical data, and specific questions about FTSD. A total of 190 questionnaires were distributed: 82 (43.15%) were returned, but only 65 were acceptable for the study.

In our series, 16.92% of participants (11/65 individuals) reported suggestive symptoms of FTSD with a mean age of 45.82±14.96 years; European ancestry was reported in 72.23% of the cases. As in other international series, in our survey, men were more affected than women (poner números: 8 men, 3 women ), and we observed a trend towards a positive correlation between FTSD occurrence and longer practice time or longer period playing musical instruments. In agreement with international series, musicians from the Philharmonic Orchestra showed the highest prevalence of FTSD when compared with the City Hall Orchestra. The Philharmonic Orchestra repertoire most likely requires more complex performances and a greater number of hours for practice.

The prevalence of dystonia in our series appears to be higher than others, but we cannot exclude two relevant factors for overestimation of prevalence: the first is related to the screening tool employed for assessment, as we had used a non-validated questionnaire performed ad hoc. The second factor is the absence of clinical examination, especially if we take into account that several of a number of “mimic” conditions, such as pain, overuse, or nerve compression syndrome, could be present.12

The assessment of dystonia in these communities of artists represents a great challenge in Latin America. The lower rate of participation in this survey probably reflects that in Latin America work and economic conditions are different from Europe or North America.4, 5 Moreover, the major concern to participate the survey was the fear of losing their job was a major concern that had to be overcome before subjects took part in the survey. Extensive and comprehensive epidemiological studies, including neurological examination, are required to improve health and work conditions of this population in our region.

Acknowledgments

We thank Prof. Dr. Med. Eckart Altenmüller for his scientific assistance and all participants.

References

1. Frucht SJ. Focal task-specific dystonia—from early descriptions to a new, modern formulation. Tremor Other Hyperkinet Mov (NY). 2014; http://tremorjournal.org/article/view/230.

2. Nutt JG, Muenter MD, Melton LJ, et al. Epidemiology of dystonia in Rochester, Minnesota. Adv Neurol 1988;50:361–365.

3. Nakashima K, Kusumi M, Inoue Y, Takahashi K. Prevalence of focal dystonias in the western area of Tottori Prefecture in Japan. Mov Disord 1995;10:440–443, doi: http://dx.doi.org/10.1002/mds.870100406.

4. Altenmüller E, Jabusch HC. Focal dystonia in musicians: phenomenology, pathophysiology, triggering factor, and treatment. Med Probl Perform Art 2010;25:3–9.

5. Dommerholt J. Performing arts medicine in instrumentalist musicians. Part I. General considerations. J Bodyw Mov Ther 2009;13:311–319, doi: http://dx.doi.org/10.1016/j.jbmt.2009.02.003.

6. Aránguiz R, Chana-Cuevas P, Alburquerque D, Curinao X. Focal dystonia in musicians: phenomenology and musical triggering factors. Neurologia 2014; pii:S0213-4853(14)00021-8 doi: 10.1016/j.nrl.2013.12.024. [Epub ahead of print]

7. Gatto EM, Pardal MM, Reisin RC, Pardal AM. Playing harp, another unusual task-specific dystonia. Mov Disord 2001;16:778–779, doi: http://dx.doi.org/10.1002/mds.1134.

8. Teixeira CS, Kothe F, Pereira F, et al. Musculoskeletal overuse and factors associated in orchestral musicians. Motriz (Online) 2010;16:17–27.

9. Frank A, von Mühlen CA. Factors playing-related musculoskeletal complaints among musicians: prevalence and risk factors. Rev Bras Reumatol 2007;47,188–196, doi: http://dx.doi.org/10.1590/S0482-50042007000300008.

10. Campos de Oliveira CF, Gomide Vezzá FM. A saúde dos músicos: dor na prática profissional de músicos de orquestra no ABCD paulista. [Musicians' health: pain resulting from playing musical instruments among members of orchestras of the ABCD region, São Paulo, Brazil]. Rev Bras Saúde Ocup São Paulo 2010;35:33–40., doi: http://dx.doi.org/10.1590/S0303-76572010000100005

11. Gatto E, Chade A, Persi G, et al. Prevalence of focal task specific dystonia among professional musicians in a community based study from Argentina. Mov Disord 2010;(Supp 25):67 abstract.

12. Rosset-Llobet J, Candia V, Fábregas i Molas S, Dolors Rosinés I Cubells, Pascual-Leone A. The challenge of diagnosing focal hand dystonia in musicians. Eur J Neurol 2009;16:864–869, doi: http://dx.doi.org/10.1111/j.1468-1331.2009.02610.x.

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License.

The opinions expressed within this journal do not necessarily reflect those of Tremor, its staff, its advisory Boards, or affiliates, or those of Columbia University.