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Scott K, O'Donovan C, Brancati GE, Cervantes P, Ardau R, Manchia M, Severino G, Rybakowski J, Tondo L, Grof P, Alda M, Nunes A. Phenotypic clustering of bipolar disorder supports stratification by lithium responsiveness over diagnostic subtypes. Acta Psychiatr Scand 2024; 150:91-104. [PMID: 38643982 DOI: 10.1111/acps.13692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 03/08/2024] [Accepted: 04/10/2024] [Indexed: 04/23/2024]
Abstract
INTRODUCTION The aim of this study was to determine whether the clinical profiles of bipolar disorder (BD) patients could be differentiated more clearly using the existing classification by diagnostic subtype or by lithium treatment responsiveness. METHODS We included adult patients with BD-I or II (N = 477 across four sites) who were treated with lithium as their principal mood stabilizer for at least 1 year. Treatment responsiveness was defined using the dichotomized Alda score. We performed hierarchical clustering on phenotypes defined by 40 features, covering demographics, clinical course, family history, suicide behaviour, and comorbid conditions. We then measured the amount of information that inferred clusters carried about (A) BD subtype and (B) lithium responsiveness using adjusted mutual information (AMI) scores. Detailed phenotypic profiles across clusters were then evaluated with univariate comparisons. RESULTS Two clusters were identified (n = 56 and n = 421), which captured significantly more information about lithium responsiveness (AMI range: 0.033 to 0.133) than BD subtype (AMI: 0.004 to 0.011). The smaller cluster had disproportionately more lithium responders (n = 47 [83.8%]) when compared to the larger cluster (103 [24.4%]; p = 0.006). CONCLUSIONS Phenotypes derived from detailed clinical data may carry more information about lithium responsiveness than the current classification of diagnostic subtype. These findings support lithium responsiveness as a valid approach to stratification in clinical samples.
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Affiliation(s)
- Katie Scott
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Claire O'Donovan
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Giulio Emilio Brancati
- Department of Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Pablo Cervantes
- Department of Psychiatry, McGill University Health Centre, Montreal, Quebec, Canada
| | - Rafaella Ardau
- Unit of Clinical Pharmacology, University Hospital of Cagliari, Cagliari, Italy
| | - Mirko Manchia
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Giovanni Severino
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy
| | - Janusz Rybakowski
- Department of Adult Psychiatry, Poznan University of Medical Sciences, Poznan, Poland
| | - Leonardo Tondo
- Department of Psychiatry, Harvard Medical School, Boston, Nova Scotia, USA
- Lucio Bini Mood Disorder Center, Cagliari, Italy
| | - Paul Grof
- Mood Disorders Center of Ottawa, Ottawa, Ontario, Canada
- Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
| | - Martin Alda
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Abraham Nunes
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada
- Faculty of Computer Science, Dalhousie University, Halifax, Nova Scotia, Canada
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Lopez-Jaramillo C. Advancing psychiatric care: The transition from symptom-based diagnosis to personalized psychiatry. Eur Neuropsychopharmacol 2024; 80:36-37. [PMID: 38310747 DOI: 10.1016/j.euroneuro.2023.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 10/30/2023] [Indexed: 02/06/2024]
Affiliation(s)
- Carlos Lopez-Jaramillo
- Department of Psychiatry, Faculty of Medicine, Universidad de Antioquia, Medellin, Colombia.
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