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Rapid Cycling Bipolar — MRCPsych Paper B MCQ

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HardMood DisordersRapid Cycling BipolarMRCPsych Paper B

A 35-year-old woman with bipolar I disorder has experienced five distinct affective episodes during the past 12 months, with intervening remission or switches in polarity. She is currently euthymic and asks whether this rapid-cycling course requires a different maintenance strategy. According to NICE CG185, which principle should guide her treatment?

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Correct answer: E — Offer the same interventions used for other bipolar disorders because evidence does not support a separate treatment pathway

The correct answer is E. NICE CG185 explicitly recommends offering people with rapid-cycling bipolar disorder the same interventions as those with other forms of bipolar disorder, because there is no strong evidence supporting a separate treatment pathway. Management should instead be individualised according to episode polarity, previous response, adverse effects, preferences, comorbidity and reproductive safety. Rapid cycling does not reliably establish lithium non-response, so A is incorrect. It also does not automatically justify combination treatment or preferential lamotrigine use, excluding C and D. ECT may be considered for rapid short-term treatment of severe or prolonged mania when other treatments have failed or the condition is life-threatening; episode frequency alone is not an indication for routine maintenance ECT.

Reference: National Institute for Health and Care Excellence. Bipolar disorder: assessment and management (CG185), recommendation 1.1.3. Updated 2025. https://www.nice.org.uk/guidance/cg185/chapter/Recommendations