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Objective  To determine the impact of a national strategy to promote implementation of a guideline on the management of mild, non-proteinuric hypertension in pregnancy.

Design  Simple, interrupted time series analysis.

Setting  Four maternity units in Scotland.

Population  Women delivering a live or stillborn baby.

Methods  Dissemination of the guideline under the auspices of a national clinical effectiveness programme, supported by a national launch meeting and feedback from a survey of obstetricians highlighting aspects of care that could be improved.

Main outcome measures  Appropriateness of initial investigation and subsequent clinical management, and costs of guideline development and implementation activities.

Data collection  Twenty-four months pre-intervention and 12 months post-intervention data were abstracted from a random sample of case notes.

Results  Initial investigation was consistent with recommendations for 59.9% out of 1263 women and subsequent clinical management for 67.6% out of 1081 in whom a diagnosis could be made from available data. There were no significant changes in the appropriateness of initial investigation (10.6%; 95% confidence interval [CI] −0.1% to 19.3%; decreasing by 1.2% per month post-implementation, 95% CI −2.5% to 0.1%) or clinical management (−0.3%; 95% CI −8.7% to 11.2%). Guideline development and implementation cost an estimated £2784 per maternity unit in Scotland.

Conclusions  Clinical care of mild hypertension in pregnancy remains highly inconsistent. The lack of the intervention effect may be related to the complexity of the guideline recommendations and the nature of the implementation strategy.