ABSTRACT

Objective:

This article aims to describe the adaptation and translation process of the Bush-Francis Catatonia Rating Scale (BFCRS) and its reduced version, the Bush-Francis Catatonia Screening Instrument (BFCSI) for Brazilian Portuguese, as well as its validation.

Methods:

Semantic equivalence processes included four steps: translation, back translation, evaluation of semantic equivalence and a pilot-study. Validation consisted of simultaneous applications of the instrument in Portuguese by two examiners in 30 catatonic and 30 non-catatonic patients.

Results:

Total scores averaged 20.07 for the complete scale and 7.80 for its reduced version among catatonic patients, compared with 0.47 and 0.20 among non-catatonic patients, respectively. Overall values of inter-rater reliability of the instruments were 0.97 for the BFCSI and 0.96 for the BFCRS.

Conclusion:

The scale's version in Portuguese proved to be valid and was able to distinguish between catatonic and non-catatonic patients. It was also reliable, with inter-evaluator reliability indexes as high as those of the original instrument.

Keywords:
catatonia; humans; psychometrics; translations

RESUMO

Objetivo:

O artigo tem como objetivo descrever o processo de tradução e adaptação da Escala de Catatonia Bush-Francis (ECBF) e de sua versão reduzida (ICBF) para o Português, bem como sua validação.

Métodos:

O processo de equivalência semântica foi realizado em quatro passos: tradução, retro-tradução, avaliação da equivalência semântica e estudo-piloto. A validação consistiu em aplicações dos instrumentos em português simultâneas por dois avaliadores em 30 pacientes com catatonia e 30 pacientes sem catatonia.

Resultados:

Média dos escores totais em pacientes catatônicos foi de 20,07 para a versão completa e 7,80 para versão reduzida, contra 0,47 e 0,20 em pacientes não-catatônicos respectivamente. Valores gerais para confiabilidade inter-observador dos instrumentos foi de 0,97 para ICBF e 0,96 para ECBF.

Conclusão:

A versão em Português da escala provou ser válida e capaz de diferenciar pacientes catatônicos daqueles sem catatonia. Também mostrou ser confiável, com índices inter-avaliadores tão altos quanto no instrumento original.

Palavras-chave:
catatonia; humanos; psicometria; traduções

Catatonia has historically been associated with schizophrenia, but it has also been connected to other diagnostic categories such as organic diseases¹1. Gelenberg AJ. The catatonic syndrome. Lancet. 1976;1(7973):1339-41. doi:10.1016/S0140-6736(76)92669-6
https://doi.org/10.1016/S0140-6736(76)92... ^,22. Wilcox JA, Nasrallah HA. Organic factors in catatonia. Br J Psychiatry. 1986;149(6):782-4. doi:10.1192/bjp.149.6.782
https://doi.org/10.1192/bjp.149.6.782... and several mental disorders³3. Abrams R, Taylor MA. Catatonia: A prospective clinical study. Arch Gen Psychiatry. 1976;33(5):579-81. doi:10.1001/archpsyc.1976.01770050043006
https://doi.org/10.1001/archpsyc.1976.01... ^,44. Barnes M P, Saunders M., Walls TJ., Saunders I, Kirk CA. The syndrome of Karl Ludwig Kahlbaum. J Neurol Neurosurg Psychiatry 1986;49(9):991-6. doi:10.1136/jnnp.49.9.991
https://doi.org/10.1136/jnnp.49.9.991... ^,55. Ries RK. DSM-III implications of the diagnoses of catatonia and bipolar disorder. Am J Psychiatry, 1985;142(12):1471-4. doi:10.1176/ajp.142.12.1471
https://doi.org/10.1176/ajp.142.12.1471... . More precisely, in the DSM-5⁶6 . American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 5th ed.. Washington, DC: American Psychiatric Association; 2013., catatonia is not an independent nosologic category. Diversely, the DSM-5 states that: a) catatonia is associated with other mental disorders (for example, neurodevelopmental disorders, psychotic disorders, bipolar disorder); b) a catatonic disorder may be due to another medical condition and; c) there are unspecified catatonia disorders. According to the DSM-5, catatonia is defined by three or more of the following 12 psychomotor features: stupor, catalepsy, waxy flexibility, mutism, negativism, posturing, mannerism, stereotypy, agitation not caused by external stimuli, grimacing, echolalia and echopraxia.

Despite the ongoing belief that catatonia has become less frequent due to the advent of antipsychotic medication, catatonia may actually be underdiagnosed and little-recognized by untrained examiners⁷7. Fink M, Taylor MA. Catatonia: a clinician's guide to diagnosis and treatment. Cambridge University Press: Cambridge; 2003.^,88. Rosebush PI, Hildebrand AM, Furlong BG, Mazurek MF. Catatonic syndrome in a general psychiatric inpatient population: frequency, clinical presentation, and response to lorazepam. J Clin Psychiatry. 1990;51(9):357-62.^,99. Chalasani P, Healy D, Morriss R. Presentation and frequency of catatonia in new admissions to two acute psychiatric admission units in India and Wales. Psychol Med. 2005;35(11):1667-75. doi:10.1017/S0033291705005453
https://doi.org/10.1017/S003329170500545... ^,1010. Heijden FM, Tuinier S, Arts NJ, Hoogendoorn ML, Kahn RS, Verhoeven WM. Catatonia: disappeared or under-diagnosed? Psychopathology. 2005;38(1):3-8. doi:10.1159/000083964
https://doi.org/10.1159/000083964... . As it is a severe and possibly lethal disorder, early diagnosis and treatment are paramount. Nevertheless, there are few studies about the syndrome, especially regarding its treatment. A search of the term “catatonia” was performed in the Medline database in 2011 with no time boundaries regarding publication year, and yet only 48 clinical trials were retrieved. Of those, only 16 had catatonia as the main theme. Most emphasized treatment of the disorder and did not address its etiopathogeny. None of them used specific scales to diagnose catatonia and few studies were controlled¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... .

Scales to evaluate catatonia have been proposed and developed in the last decades but are still very few in number. The review from 2011¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... showed that there are seven tools for the evaluation and classification of catatonia available in the literature, all in English: Modified Rogers Catatonia Scale¹²12. Lund CE, Mortimer AM, Rogers D, McKenna PJ. Motor, volitional and behavioural disorders in schizophrenia. 1: assessment using the Modified Rogers Scale. Br J Psychiatry. 1991;158(3):323-7. doi:10.1192/bjp.158.3.323
https://doi.org/10.1192/bjp.158.3.323... ; Rogers Catatonia Scale¹³13. Starkstein SE, Petracca G, Tesón A, Chemerinski E, Merello M, Migliorelli R et al. Catatonia in depression: prevalence, clinical correlates, and validation of a scale. J Neurol Neurosurg Psychiatry. 1996;60(3):326-32. doi:10.1136/jnnp.60.3.326
https://doi.org/10.1136/jnnp.60.3.326... ; Bush-Francis Catatonia Rating Scale (BFCRS)¹⁴14. Bush G, Fink M, Petrides G, Dowling F, Francis A. Catatonia. I. Rating scale and standardized examination. Acta Psychiatr. Scand. 1996a;93(2):129-36. doi:10.1111/j.1600-0447.1996.tb09814.x
https://doi.org/10.1111/j.1600-0447.1996... ; a revision of the BFCRS proposed by Ungvari¹⁵15. Ungvari GS, Goggins W, Leung SK, Gerevich J. Schizophrenia with prominent catatonic features (‘catatonic schizophrenia’). II. Factor analysis of the catatonic syndrome. Prog. Neuropsychopharmacol. Biol. Psychiatry. 2007;31(2):462-8. doi:10.1016/j.pnpbp.2006.11.012
https://doi.org/10.1016/j.pnpbp.2006.11.... ; Northoff Catatonia Rating Scale¹⁶16. Northoff G, Koch A, Wenke J, Eckert J, Böker H, Pflug B et al. Catatonia as a psychomotor syndrome: a rating scale and extrapyramidal motor symptoms. Mov Disord. 1999;14(3):404-16. doi:10.1002/1531-8257(199905)14:3<404::AID-MDS1004>3.0.CO;2-5
https://doi.org/10.1002/1531-8257(199905... ; Braunig Catatonia Rating Scale¹⁷17. Bräunig P, Krüger S, Shugar G, Höffler J, Börner I. The catatonia rating scale I — development, reliability, and use. Compr Psychiatry. 2000;41(2):147-58. doi:10.1016/S0010-440X(00)90148-2
https://doi.org/10.1016/S0010-440X(00)90... ; and the Kanner Scale¹⁸18. Carroll BT, Kirkhart R, Ahuja N, Soovere I, Lauterbach EC, Dhossche Det al. Katatonia: a new conceptual understanding of catatonia and a new rating scale. Psychiatry (Edgmont). 2008;5(12):42-50..

The Bush-Francis Scale, created in 1996, is the most widely used due to its validity, reliability and ease of application. The Bush-Francis Scale has two versions: a longer one (BFCRS) with 23 items rated from 0 to 3 to evaluate catatonic symptom severity; and a reduced version, the Bush-Francis Catatonia Screening Instrument (BFCSI), with only the first 14 items, to evaluate presence or absence of catatonic symptoms, and to screen for syndrome. The original version of that scale was tested by its authors in a sample of 28 catatonic patients and showed a high inter-evaluator reliability (kappa = 0.93). Besides, diagnoses formulated with the BFCSI were in accordance with other criteria for catatonia, between 75% and 100%. That confirmed the conclusion that the instrument is reliable and valid¹⁴14. Bush G, Fink M, Petrides G, Dowling F, Francis A. Catatonia. I. Rating scale and standardized examination. Acta Psychiatr. Scand. 1996a;93(2):129-36. doi:10.1111/j.1600-0447.1996.tb09814.x
https://doi.org/10.1111/j.1600-0447.1996... .

No versions of the Bush-Francis Scale in other languages were found. To the best of our knowledge, there is no screening and classification instrument for catatonia adapted to Portuguese, nor one in which psychometric characteristics have been studied¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... .

The present article aims to describe the process of translation and adaptation of the BFCRS into Brazilian Portuguese as well as its validation.

METHODS

Forward and back translation and semantic equivalence processes

The BFCRS's semantic equivalence process included four steps: translation, back translation, semantic equivalence evaluation and a pilot-study, according to Herdman et al.'s protocol¹⁹19. Herdman M; Fox-Rushby J, Badia X. A model of equivalence in the cultural adaptation of HRQoL instruments: the universalist approach. Qual Life Res. 1998;7(4):323-35. doi:10.1023/A:1008846618880
https://doi.org/10.1023/A:1008846618880... .

Two translations into Portuguese of the original BFCRS were made by two bilingual psychiatrists, independently from each other. Both translations were back translated into English by two other bilingual psychiatrists, also independently from each other. These back translations were evaluated with regard to their adequacy by one of the authors of the original scale (A. Francis). Finally, a third set of two bilingual psychiatrists (who were not involved in the previous phases) created a version of the BFCRS in Brazilian Portuguese based on the BFCRS's original text, both translations, back translations and the author's evaluation of the back translations. This version incorporated a few items from one of the translated versions. Other items in the synthetic version were a combination of items of each translation. Before developing the final version; items were evaluated with regard to the conceptual equivalence by two psychiatrists, and items rated as unclear were changed. A few items required a third alternative to the translated versions and that was done in order to achieve the best semantic equivalence possible.

Validation

A complete final version of the scale in Portuguese was applied to patients in a psychiatric hospital – Federal University of Rio de Janeiro Psychiatry Institute (IP/UFRJ) – in Rio de Janeiro, and patients in a non-psychiatric hospital – Federal University of Belo Horizonte General Hospital, in Belo Horizonte, between June, 2011 and November, 2013.

The criteria used to diagnose catatonia were made according to the DSM-IV-TR²⁰20. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 4th ed. Washington, DC: American Psychiatric Association; 2000., that is, the presence of at least two of the following symptoms: catalepsy, agitation, negativism, posturing, and echophenomena (echolalia or echopraxia). The catatonia diagnosis was determined by only one of the researchers in each center: ALSN, in Rio de Janeiro and RN, in Belo Horizonte.

The Brazilian version of the instrument was applied to 30 catatonic patients, 23 in Rio de Janeiro and seven in Belo Horizonte. The patients were the first 30 who were hospitalized with the diagnosis of catatonia in both hospitals from the beginning of the study. During the same period, the instrument was also applied to the first 30 non-catatonic inpatients in the Rio de Janeiro hospital, who agreed to participate.

The scale was applied to each of the 60 patients simultaneously, though independently, by two psychiatrists, with the objective of evaluating inter-observer agreement.

Statistical analysis

Means and standard deviations were compared through the t-Student test for independent samples²¹21. McClave JT, Sincich T. Statistics. New Jersey: Prentice Hall; 2012.. Inter-observer agreement was evaluated through Pearson's product-moment correlation. Correlation was calculated for each item and for the total score of both scales. The r value considered was ≥ 0.70, both for the total scores of the scales and the scores of each item, which is considered a high score. The analyses were conducted using the software SPSS 21.0²²22. IBM Corp. Released 2012. IBM SPSS statistics for Windows, Version 21.0, Armonk: IBM Corp; 2012..

Ethical statement

All the patients – or alternatively their family, whenever patients were not able to express their will – agreed to take part in the study. They also signed an informed consent form. This research was approved by the Institutional Ethical Board of IPUB/UFRJ.

RESULTS

Table 1 shows a few of the translations as examples, back translation and preparation phases of the Brazilian Portuguese version of the BFCRS. The author of the scale was of the opinion that, in general, one of the back translations was closer to the original version and, for that reason, it was taken into greater consideration when preparing the Brazilian version of the BFCRS.

During the preparation of the final version, a few items proved divergent as neither of the translations was fully adequate for the item's purpose. Because of this, the researchers charged with preparing the summary version replaced a few terms with the objective of improving the instrument, as in items 4 and 5. Other items, such as 17 and 18, had terms in German that had no translation in Portuguese. The terms were, therefore, kept in German. For some items, one of the translations was closer to the original text and, for that reason, this translation was maintained in the final form. There was no divergence for most of the items and both translations were very similar and compatible with the original version.

As shown in Table 2, the total scores given by examiner 1 to the catatonic patients were, on average, significantly higher than the scores given to non-catatonic patients, both for the longer scale (BFCRS) as well as the shorter form (BFCSI). This shows that the Brazilian version of the instrument is able to distinguish both groups.

When considering only the catatonic patients, inter-rater reliability for the evaluation of each item of the instrument was high, as can be seen in Table 3. The total score correlation was also high, which means that even when the evaluators did not give the same score for each item, the total scores showed strong agreement in the end.

DISCUSSION

This study consisted of the translation and adaptation into Brazilian Portuguese of the most valuable scale for the evaluation of catatonic states, the BFCRS¹⁴14. Bush G, Fink M, Petrides G, Dowling F, Francis A. Catatonia. I. Rating scale and standardized examination. Acta Psychiatr. Scand. 1996a;93(2):129-36. doi:10.1111/j.1600-0447.1996.tb09814.x
https://doi.org/10.1111/j.1600-0447.1996... . Validation of the instrument was made in two ways. Initially, when applied to catatonic and non-catatonic patients, the Brazilian version of the BFCRS was able to distinguish between both groups. As well, it showed a high inter-observer reliability index.

The inter-rater reliability indexes found in this study were practically identical to the ones obtained by the authors of the original instrument when it was validated¹⁴14. Bush G, Fink M, Petrides G, Dowling F, Francis A. Catatonia. I. Rating scale and standardized examination. Acta Psychiatr. Scand. 1996a;93(2):129-36. doi:10.1111/j.1600-0447.1996.tb09814.x
https://doi.org/10.1111/j.1600-0447.1996... . The original version of the scale was tested by the authors in a sample of 28 catatonic patients and showed inter-rater reliability (kappa = 0.93). In our sample, the correlation values found were also high for both the longer form (r = 0.96) and for the screening version (r = 0.97). In our study, we used Pearson's correlation, which is usually applied when two experts are observing the same phenomenon and both give scores from a range, which was our case²³23. Saal FE, Downey RG, Lahey MA. Rating the ratings: assessing the psychometric quality of rating data. Psychol Bull. 1980;88(2):413-28. doi:10.1037/0033-2909.88.2.413
https://doi.org/10.1037/0033-2909.88.2.4... . Elsewhere, on the original scale, the authors used Cohen's kappa, which determines agreement among judges, typically used when judging the suitability of an item to a scale and for nominal data²⁴24. Strijbos JW, Martens RL, Prins FJ, Jochems WM. Content analysis: what are they talking about? Comp Educ. 2006;(1):29-48. doi:10.1016/j.compedu.2005.04.002
https://doi.org/10.1016/j.compedu.2005.0... . The correlation assumes that the scale of response is an interval, as in our case²⁵25. Bland J M, Altman DG. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet. 1986;1(8476):307-10..

A literature review conducted by Sienaert et al. in 2011¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... pointed out that the original version of the BFCRS deserves special mention among available instruments that presently evaluate catatonia for its ease of application – the screening version may be applied in about five minutes by a well-trained examiner. The Braunig Catatonia Rating Scale, in contrast, takes about 45 minutes to be applied. In addition, the BFCRS offers a semi-structured interview, diverging from other instruments, like the Rogers Catatonia Scale and Modified Rogers Catatonia Scale, for example. These authors consider it preferable, in routine clinical practice, to improve the prompt detection of the catatonic syndrome and to measure the treatment response¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... . Catatonia evaluation scales have rarely been used in studies that measure response to treatment. Nevertheless, one study has already shown that the BFCRS is sensitive to the changes in the severity of the catatonic symptoms during treatment with lorazepam and electroconvulsive therapy²⁶26. Bush G, Fink M, Petrides G, Dowling F, Francis A. Catatonia. II. Treatment with lorazepam and electroconvulsive therapy. Acta Psychiatr. Scand. 1996b;93(2):137-43. doi:10.1111/j.1600-0447.1996.tb09815.x
https://doi.org/10.1111/j.1600-0447.1996... . Despite being considered valid and widely used, a lack of uniformity and the existence of inaccurate definitions and symptoms are said to be some of its limitations²⁷27. Kirkhart R, Ahuja N, Lee JW, Ramirez J, Talbert R, Faiz K et al. The detection and measurement of catatonia. Psychiatry (Edgmont). 2007;4(9):52-6.. We found only one revision of the BFCRS proposed by Gabor Ungvari, who applied the instrument to 225 randomly selected, chronic schizophrenic inpatients. However, in Sienaert's review, this was considered purely a statistical manipulation, and not a distinct scale¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... .

The psychometric properties of all the instruments available for the evaluation of catatonia have not been addressed in this work, because the main goal was the comparison between the original version and the Brazilian version. However, the expansion of this comparison may strengthen, in a second study, the arguments in favor of the greater applicability of the BFCRS.

The idea that catatonia is associated with schizophrenia has been incorporated into several editions of the DSM and International Classification of Diseases²⁸28. Taylor MA, Fink M. Catatonia in psychiatric classification: a home of its own. Am J Psychiatry. 2003;160(7):1233-41. doi:10.1176/appi. ajp.160.7.1233
https://doi.org/10.1176/appi.ajp.160.7.1... and is still defended by several authors²⁹29. Pfuhlmann B, Stöber G. The different conceptions of catatonia: historical overview and critical discussion. Eur Arch Psychiatry Clin Neurosci. 2001;251(S1):I4-7. doi:10.1007/PL00014199
https://doi.org/10.1007/PL00014199... . Such an historical definition partially explains the lack of care regarding the catatonic syndrome and its dramatic underdiagnosis¹⁰10. Heijden FM, Tuinier S, Arts NJ, Hoogendoorn ML, Kahn RS, Verhoeven WM. Catatonia: disappeared or under-diagnosed? Psychopathology. 2005;38(1):3-8. doi:10.1159/000083964
https://doi.org/10.1159/000083964... . It has become clear, though, that catatonic symptoms can be observed not only in schizophrenia but also in several mental disorders, especially affective disorders³⁰30. Daniels J. Catatonia: clinical aspects and neurobiological correlates. J Neuropsychiatry Clin Neurosci. 2009;21(4):371-80. doi:10.1176/jnp.2009.21.4.371
https://doi.org/10.1176/jnp.2009.21.4.37... ^,3131. Fink M, Shorter E, Taylor MA. Catatonia is not schizophrenia: kraepelin's error and the need to recognize catatonia as an independent syndrome in medical nomenclature. Schizophr Bull. 2010;36(2):31-20. doi:10.1093/schbul/sbp059
https://doi.org/10.1093/schbul/sbp059... . Nowadays, many researchers consider catatonia as an independent nonspecific nosologic category since it can easily be recognized and distinguished from other conditions, has specific development and shows effective responses to treatment⁷7. Fink M, Taylor MA. Catatonia: a clinician's guide to diagnosis and treatment. Cambridge University Press: Cambridge; 2003.^,2828. Taylor MA, Fink M. Catatonia in psychiatric classification: a home of its own. Am J Psychiatry. 2003;160(7):1233-41. doi:10.1176/appi. ajp.160.7.1233
https://doi.org/10.1176/appi.ajp.160.7.1... ^,3232. Dhossche DM, Wachtel LE. Catatonia is hidden in plain sight among different pediatric disorders: a review article. Pediatr Neurol. 2010;43(5):307-15. doi:10.1016/j.pediatrneurol.2010.07.001
https://doi.org/10.1016/j.pediatrneurol.... . Nevertheless, this is not referred to in present diagnostic compendiums. Such a poor classification status discourages the diagnosis of catatonia in non-psychotic disorders¹⁰10. Heijden FM, Tuinier S, Arts NJ, Hoogendoorn ML, Kahn RS, Verhoeven WM. Catatonia: disappeared or under-diagnosed? Psychopathology. 2005;38(1):3-8. doi:10.1159/000083964
https://doi.org/10.1159/000083964... . The lack of a psychopathological definition and conceptual understanding of catatonia¹⁸18. Carroll BT, Kirkhart R, Ahuja N, Soovere I, Lauterbach EC, Dhossche Det al. Katatonia: a new conceptual understanding of catatonia and a new rating scale. Psychiatry (Edgmont). 2008;5(12):42-50. jeopardizes research in the field. There is a growing need of a clear definition of the concept as well as of reliable evaluation instruments to guide both researchers and clinicians in catatonia diagnoses and evaluation, not to mention treatment. Improving detection and evaluation of catatonia is important due to the fact that the presence of catatonic symptoms has significant prognostic and therapeutic value¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... .

Improvements brought about by the standardization of evaluation, classification and diagnosis through psychometric instruments for a syndrome with high morbidity and mortality rates that historically has been underdiagnosed, especially when wrongly treated, justify the efforts for the development and improvement of proper instruments¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... . The use of scales will make diagnosis and therapeutic practices easier in the clinical realm and will enable further clinical trials on this so far underexamined syndrome¹¹11. Sienaert P, Rooseleer J, De Fruyt J. Measuring catatonia: a systematic review of rating scales. J Affect Disord. 2011;135(1-3):1-9. doi:10.1016/j.jad.2011.02.012
https://doi.org/10.1016/j.jad.2011.02.01... .

The BFCRS version in Portuguese presented here shows high validity, reliability and inter-rater reliability indexes, similar to the original version. The BFCRS is the most widely-used scale for catatonia evaluation available at present. We believe that the Brazilian version will be of great use for the Portuguese-speaking populations both in clinical practice and in research, since no other instrument for the evaluation of catatonia has so far been available in the language.

References

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