• Edward Pringle, Charles Phillips, Lutgarde Thijs, Christopher Davidson, Jan A Staessen, Peter W de Leeuw, Matti Jaaskivi, Choudomir Nachev, Gianfranco Parati, Eoin T O'Brien, Jaakko Tuomilehto, John Webster, Christopher J Bulpitt, Robert H Fagard, and Syst-Eur investigators.
• Royal Sussex County Hospital, Brighton, UK.
• J. Hypertens. 2003 Dec 1;21(12):2251-7.

ObjectiveTo investigate whether baseline systolic blood pressure variability was a risk factor for stroke, cardiovascular mortality or cardiac events during the Syst-Eur trial.DesignThe Syst-Eur study was a randomized, double-blind, placebo-controlled trial, powered to detect differences in stroke rate between participants on active antihypertensive treatment and placebo. Systolic blood pressure variability measurements were made on 744 participants at the start of the trial. Systolic blood pressure variability was calculated over three time frames: 24 h, daytime and night-time. The placebo and active treatment subgroups were analysed separately using an intention-to-treat principle, adjusting for confounding factors using a multiple Cox regression model.ParticipantsAn elderly hypertensive European population.Main Outcome MeasuresStroke, cardiac events (fatal and non-fatal heart failure, fatal and non-fatal myocardial infarction and sudden death) and cardiovascular mortality (death attributed to stroke, heart failure, myocardial infarction, sudden death, pulmonary embolus, peripheral vascular disease and aortic dissection).ResultsThe risk of stroke increased by 80% (95% confidence interval: 17-176%) for every 5 mmHg increase in night-time systolic blood pressure variability in the placebo group. Risk of cardiovascular mortality and cardiac events was not significantly altered. Daytime variability readings did not predict outcome. Antihypertensive treatment did not affect systolic blood pressure variability over the median 4.4-year follow-up.ConclusionIn the placebo group, but not the active treatment group, increased night-time systolic blood pressure variability on admission to the Syst-Eur trial was an independent risk factor for stroke during the trial.

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