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Viguera et al. 2007 — Risk of recurrence in women with bipolar disorder during pregnancy

One-paragraph summary

This prospective observational cohort followed 89 pregnant women with DSM-IV bipolar disorder who were euthymic at conception and either continued or discontinued mood-stabilizer treatment near conception. Overall, 71% had a mood recurrence during pregnancy. Discontinuation was associated with twice the recurrence risk, more than fourfold shorter median time to recurrence and fivefold more weeks ill; abrupt or rapid withdrawal shortened recurrence latency 11-fold relative to gradual withdrawal. Most recurrences were depressive or mixed (74%), and 47% occurred during the first trimester (Viguera 2007, PMID 18056236).

Key findings

  • Population: 89 pregnant women with DSM-IV bipolar disorder, euthymic at conception.
  • Any pregnancy recurrence: 71%.
  • Discontinuation versus continuation: approximately twofold greater recurrence risk.
  • Median time to first recurrence after discontinuation: more than fourfold shorter.
  • Proportion of pregnancy weeks ill after discontinuation: fivefold greater.
  • Abrupt/rapid versus gradual discontinuation: 11-fold shorter median recurrence latency.
  • Polarity: 74% of recurrences were depressive or mixed.
  • Timing: 47% of recurrences occurred during trimester one.
  • Reported predictors included bipolar II, earlier onset, more prior recurrences per year, recent illness, antidepressant use and anticonvulsant rather than lithium exposure.

Limitations

  • Treatment continuation was not randomized, so baseline prognosis and treatment indication may confound associations.
  • The cohort was modest and drawn from specialized clinical settings.
  • Individual drugs were not assigned, limiting comparative medication inference.
  • DSM-IV diagnosis and practice patterns predate current perinatal guidance.
  • The study addresses recurrence, not the comparative fetal safety of specific regimens.

Why it matters

The study directly challenged the assumption that pregnancy protects against bipolar episodes and made discontinuation itself a measurable exposure. Its timing, polarity and withdrawal-speed findings underpin modern preconception counseling: fetal medication risk must be balanced against substantial, early and often depressive maternal morbidity, and abrupt cessation can be especially destabilizing.

Cited by wiki pages

  • Pregnancy and reproductive health