Evidence-based assessment/Instruments/BSDS

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The Bipolar Spectrum Diagnostic Scale (BSDS) is a psychiatric self-rating scale created by Ronald Pies in screening for bipolar disorder (BD).[1] Its initial version consists of a descriptive narrative aimed to capture the nuances and milder variants of BD.[2] Upon revision by Nassir Ghaemi and colleagues, the scale was developed into two sections for a total of 20 questions.[2] The BSDS is widely accepted as an important measure of bipolar disorder alongside other diagnostic tools such as the Mood Disorder Questionnaire and the Bipolar Depression Rating Scale.[3]

Background[edit | edit source]

Bipolar Disorder (BD) is a psychiatric disorder defined by intermittent episodes of depression and (hypo)mania during the individual's lifetime. The DSM-5 and ICD-11 recognise bipolar disorder as a spectrum with three specific subtypes: Bipolar I disorder, Bipolar II disorder and cyclothymic disorder. The lifetime prevalence of BD is approximately 1% in the general population,[4] but rises to 4% when given the broader definition of bipolar spectrum disorder. As a result of the broad and complex nature of bipolar disorder, misdiagnosis is fairly common: 69% of confirmed cases are found to be initially misdiagnosed and more than a third of individuals are misdiagnosed for ten years onwards.[5] For individuals with milder symptoms of BD, this seems to be even more prevalent.

The BSDS was devised to estimate not only severe cases of bipolar disorder, but also milder variants in a more sensitive manner. The scale is ideal for screening, but not for diagnosing BD as the 19 questions do not accurately reflect the main criterion of the DSM-5.[6] The scale has however been found to accurately rule out a diagnosis of BD altogether for an individual.[6]

Development[edit | edit source]

The original English Version of the BSDS consists of a descriptive passage with nineteen statements ending with a blank space. Patients are first advised to read through the entire passage before starting the assessment. Once completed, they are asked to place a check next to each of the nineteen items they feel relates to their personal experience of BD.[7] Each check is worth one point. The passage is written entirely in a third person narrative.

When assessed by Nassir Ghaemi and colleagues, the original scale demonstrated a high diagnostic sensitivity at 0.76, meaning that most people with clinicians' DSM-5-based cases were accurately diagnosed.[7] The BSDS also correctly identified 85% of unipolar-depressed patients as not having bipolar disorder despite similarities in symptoms, indicating a high specificity score.[7] To improve the original version, Ghaemi created an additional section for the BSDS. This section involved a 4-item Likert scale assessing the extent to which individuals felt that the passage related to their own experience of BD. The 4 item scale includes statements of "This story fits me very well." (worth 6 points), "This story fits me fairly well." (worth 4 points), "This story fits me to some degree but not in most respects." (worth 2 points), to "This story does not really describe me at all." (worth 0 points).[7][6] The abridged version of BSDS scores range from 0-25 points with the positive threshold for diagnosis at 13 points and above.

The likelihood of BD according to the BSDS is given based on the overall score of both sections.[1][7] Scores of 0-6 indicates a "highly unlikely" chance of having BD, 7-12 indicates a "low probability", 13-19 indicates a "moderate probability", and a score of 20-25 indicates a "high probability".

Ghaemi's BSDS version increased specificity from the original version from 0.85 to 0.93. The BSDS has since been adjusted and adapted for several other global populations, including Persia, Turkey, and Mexico.[8][9][10]

Reliability and validity[edit | edit source]

The BSDS is a well validated diagnostic tool with a high sensitivity (0.76) and specificity (0.93) score.[2] It was also found to have a high Negative Predictive Value (NPV) of 0.87, suggesting that 87% of the patients who scored below 13 points on the BSDS were correctly identified as not having BD. However, the BSDS was found to have a low Positive Predictive Value (PPV) of 0.36.[11] Zimmermann et al found a NPV as high as 0.98 and a low PPV of 0.16 when using a representative sample size of 1100 outpatients.[12] This PPV score demonstrates a vulnerability to overdiagnosing BD.

In a systematic review and meta-analysis investigating the accuracy of self-report scales for detecting Bipolar Disorder, the BSDS was found to be one of the best performing options along with the Mood Disorder Questionnaire.[13] The BSDS may do better than other scales at detecting different subtypes of bipolar disorder which do not involve a full manic episode, such as bipolar II or cyclothymic disorder.

Translations[edit | edit source]

The following table showcases the translations available for the BSDS

Translations Table
Language Source Article BSDS PDF Peer Review Psychometrics
Arabic N/A Arabic with English No
Chinese Chu et al., 2010 Yes
English Ghaemi et al., 2005 English Version Yes
Hindi Yes
Italian
Japanese Yes
Korean Wang et al., 2008 Korean Version Yes
Persian Shabani et al., 2009 Yes
Portuguese Castelo et al., 2010 Portuguese Version Yes
Spanish Vazquez et al., 2010 Spanish Version Yes (need to check)
Turkish Ince et al., 2019 Yes

Limitations[edit | edit source]

When interpreting results from the BSDS, it is important to note that the BSDS has several limitations. The BSDS is an example of a self-report scale which relies on the individual’s subjective interpretation of their own symptoms and behaviours. An individual may consciously or subconsciously misrepresent the data due to a range of factors from social desirability bias to faulty recall, which can compromise the accuracy of their BSDS score. An additional limitation is that the scale cannot confirm if an individual has bipolar disorder as it does not include all the signs of bipolar spectrum disorder listed by the DSM-5. A further limitation research studies are often conducted on small samples of outpatients, leading to varying scores of the accuracy and reliability of the BSDS.[2]

All these limitations may play some role in why the BSDS has been found to have such a low PPV, leading to the overestimation of BD in individuals completing the scale. As such, it is important that the BSDS be used in conjunction with other clinical information to make a fully accurate diagnosis, but when used alone, the BSDS can have dangerous ramifications in overdiagnosing a serious psychiatric condition such as bipolar disorder to the general population.

See also[edit | edit source]

References[edit | edit source]

  1. ↑ 1.0 1.1 Youngstrom, Eric A.; Egerton, Gregory A.; Genzlinger, Jacquelynne; Freeman, Lindsey K.; Rizvi, Sabeen H.; Van Meter, Anna (2018). "Improving the global identification of bipolar spectrum disorders: Meta-analysis of the diagnostic accuracy of checklists.". Psychological Bulletin 144 (3): 315–342. doi:10.1037/bul0000137. ISSN 1939-1455. http://doi.apa.org/getdoi.cfm?doi=10.1037/bul0000137. 
  2. ↑ 2.0 2.1 2.2 2.3 Nassir Ghaemi, S.; Miller, Christopher J.; Berv, Douglas A.; Klugman, Jeffry; Rosenquist, Klara J.; Pies, Ronald W. (2005). "Sensitivity and specificity of a new bipolar spectrum diagnostic scale". Journal of Affective Disorders 84 (2-3): 273–277. doi:10.1016/S0165-0327(03)00196-4. https://linkinghub.elsevier.com/retrieve/pii/S0165032703001964. 
  3. ↑ Lee, Dongyun; Cha, Boseok; Park, Chul-Soo; Kim, Bong-Jo; Lee, Cheol-Soon; Lee, Sojin (2013). "Usefulness of the combined application of the Mood Disorder Questionnaire and Bipolar Spectrum Diagnostic Scale in screening for bipolar disorder". Comprehensive Psychiatry 54 (4): 334–340. doi:10.1016/j.comppsych.2012.10.002. https://linkinghub.elsevier.com/retrieve/pii/S0010440X12002210. 
  4. ↑ Rowland, Tobias A.; Marwaha, Steven (2018). "Epidemiology and risk factors for bipolar disorder". Therapeutic Advances in Psychopharmacology 8 (9): 251–269. doi:10.1177/2045125318769235. ISSN 2045-1253. PMID 30181867. PMC 6116765. http://journals.sagepub.com/doi/10.1177/2045125318769235. 
  5. ↑ Mooney, Brenda (2022-05-29). "Bipolar Disorder Often Misdiagnosed as Major Depression, Leading to Improper Treatment". U.S. Medicine. Retrieved 2023-04-12.
  6. ↑ 6.0 6.1 6.2 Harrison, Paul J.; Geddes, John R.; Tunbridge, Elizabeth M. (2018). "The Emerging Neurobiology of Bipolar Disorder". Trends in Neurosciences 41 (1): 18–30. doi:10.1016/j.tins.2017.10.006. PMID 29169634. PMC 5755726. https://linkinghub.elsevier.com/retrieve/pii/S0166223617302126. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Zaratiegui, Rodolfo M.; Vázquez, Gustavo H.; Lorenzo, Laura S.; Marinelli, Marcia; Aguayo, Silvia; Strejilevich, Sergio A.; Padilla, Eduardo; Goldchluk, Aníbal et al. (2011). "Sensitivity and specificity of the mood disorder questionnaire and the bipolar spectrum diagnostic scale in Argentinean patients with mood disorders". Journal of Affective Disorders 132 (3): 445–449. doi:10.1016/j.jad.2011.03.014. https://linkinghub.elsevier.com/retrieve/pii/S0165032711000978. 
  8. ↑ Zimmerman, Mark; Galione, Janine N; Chelminski, Iwona; Young, Diane; Ruggero, Camilo J (2010-08-16). "Performance of the Bipolar Spectrum Diagnostic Scale in psychiatric outpatients: Performance of the Bipolar Spectrum Diagnostic Scale". Bipolar Disorders 12 (5): 528–538. doi:10.1111/j.1399-5618.2010.00840.x. https://onlinelibrary.wiley.com/doi/10.1111/j.1399-5618.2010.00840.x. 
  9. ↑ İnce, Bahri; Cansız, Alparslan; Ulusoy, Sevinç; Yavuz, Kasım Fatih; Kurt, Erhan; Altınbaş, Kürşat (2019). "Reliability and Validity Study of the Turkish Version of Bipolar Spectrum Diagnostic Scale". Turk Psikiyatri Dergisi = Turkish Journal of Psychiatry 30 (4): 272–278. ISSN 2651-3463. PMID 32594489. https://pubmed.ncbi.nlm.nih.gov/32594489/. 
  10. ↑ Sánchez de la Cruz, Juan Pablo; Fresán, Ana; González Moralez, Diana Laura; López-Narváez, María Lilia; Tovilla-Zarate, Carlos Alfonso; Pool-García, Sherezada; Juárez-Rojop, Isela; Hernández-Díaz, Yazmín et al. (2018-11-27). "Validation of the Bipolar Spectrum Diagnostic Scale in Mexican Psychiatric Patients". The Spanish Journal of Psychology 21: E60. doi:10.1017/sjp.2018.59. ISSN 1988-2904. PMID 30477597. https://pubmed.ncbi.nlm.nih.gov/30477597/. 
  11. ↑ Shabani, Amir; Mirzaei Khoshalani, Mosleh; Mahdavi, Seyedreza; Ahmadzad-Asl, Masoud (2019). "Screening bipolar disorders in a general hospital: Psychometric findings for the Persian version of mood disorder questionnaire and bipolar spectrum diagnostic scale". Medical Journal of the Islamic Republic of Iran 33: 48. doi:10.34171/mjiri.33.48. ISSN 1016-1430. PMID 31456972. PMC 6708087. https://pubmed.ncbi.nlm.nih.gov/31456972. 
  12. ↑ Zimmerman, Mark; Galione, Janine N. (2011-09-20). "Screening for Bipolar Disorder with the Mood Disorders Questionnaire: A Review". Harvard Review of Psychiatry 19 (5): 219–228. doi:10.3109/10673229.2011.614101. ISSN 1067-3229. https://journals.lww.com/00023727-201109200-00001. 
  13. ↑ Sayyah, Mehdi; Delirrooyfard, Ali; Rahim, Fakher (2022). "Assessment of the diagnostic performance of two new tools versus routine screening instruments for bipolar disorder: a meta-analysis". Brazilian Journal of Psychiatry 44 (3): 349–361. doi:10.1590/1516-4446-2021-2334. ISSN 1809-452X. PMID 35588536. PMC 9169473. http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-44462022000300349&tlng=en. 

Category:Bipolar disorder | Depression (mood) | Mental disorders | Mood disorders | Mania screening and assessment tools | Treatment of bipolar disorder

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