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Rapid-cycling bipolar I disorder: Course and treatment outcome of a large sample across Europe
Journal of Psychiatric Research, 06/25/09

Cruz N et al. - The EMBLEM results suggest that in naturalistic settings, patients with mania and RC differ from NRC in socio-demographic characteristics, treatment prescriptions and clinical outcome measures with a consistently worse occupational outcome and comorbidities. RC represents a longitudinally severe form of bipolar disorder, with poorly evidence-based diagnostic and therapeutic tools.

Methods

EMBLEM (European Mania in Bipolar Longitudinal Evaluation of Medication) is a long-term prospective observational study of in- and outpatients with an acute mania/mixed episode conducted in 14 European countries.
Demographic and clinical variables were collected at baseline, including the presence or absence of DSM-IV rapid-cycling during the past year.
Outcome measures included the 5-item Hamilton Depression Rating Scale (HAMD-5) and Young Mania Rating Scale (YMRS) over 12 weeks, as well as the Clinical Global Impressions-Bipolar Disorder Scale (CGI-BP overall, mania and depression) over 12 months.

Results

Of 3684 patients enrolled, 3089 patients provided reliable data to qualify for either RC (N = 535, 17.3%) or non-RC (NRC, N = 2554), according to DSM-IV.
RC prevalence varied across countries (p < 0.001).
Baseline and 12 week outcomes on the YMRS and HAMD-5, 12 month ratings on the CGI-BP subscales and work impairment at 12 months were significantly different (p < 0.001) between groups, being worse in RC.
RC patients were more likely to receive antidepressants and lamotrigine (p < 0.001).
Using logistic regression, RC was associated to country (p < 0.001), female sex (p = 0.029), outpatients (p = 0.035), more history of attempted suicide (p < 0.001) and alcohol abuse (p < 0.001).

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