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(Stroke. 2009;40:41.)
© 2009 American Heart Association, Inc.

Original Contributions

The Relationship Between Baseline Blood Pressure and Computed Tomography Findings in Acute Stroke

Data From the Tinzaparin in Acute Ischaemic Stroke Trial (TAIST)

Gillian M. Sare, MRCP; Philip M.W. Bath, FRCP; Laura J. Gray, PhD; Thierry Moulin, MD; France Woimant, MD; Timothy England, MRCP; Chamila Geeganage, MSc; Hanne Christensen, MD, PhD; Peter Paul De Deyn, MD; Didier Leys, MD; Desmond O'Neill, FRCPi; E. Bernd Ringelstein, MD for the TAIST Investigators

From Institute of Neuroscience (G.M.S., P.M.W.B., L.J.G., T.E., C.G.), University of Nottingham, Nottingham, UK; Stroke Unit (T.M.), CHU Besancon, University of Franche-Comte, Besancon, France; Department of Neurology (F.W.), Lariboisiere University Hospital, France; Department of Neurology (H.C.), Bispebjerg Hospital, Copenhagen, Denmark; Department of Neurology (P.P.D.D.), A. Z. Middelheim, ZNA, University of Antwerp, Antwerpen, Belgium; Clinique Neurologique (D.L.), CHRU de Lille, Lille, France; Department of Age Related Health Care (D.O.), Adelaide &Meath Hospital, Dublin, Ireland; Klinik für Neurologie (E.B.R.), Universität Münster, Münster, Germany.

Correspondence to Professor Philip Bath, Stroke Trials Unit, University of Nottingham, Clinical Sciences Building, City Hospital campus, Nottingham NG7 2UH UK. E-mail philip.bath{at}nottingham.ac.uk

Background and Purpose— High blood pressure (BP) is present in 80% of patients with acute ischemic stroke and is independently associated with poor outcome. There are few data examining the relationship between admission BP and acute CT findings.

Methods— TAIST was a randomized controlled trial assessing 10 days of treatment with tinzaparin versus aspirin in 1489 patients with acute ischemic stroke (<48 hr) with admission BP of 220/120 mmHg. CT brain scans were performed before randomization and after 10 days. The relationships between baseline BP and adjudicated CT findings were assessed. Odds ratios per 10 mmHg change in BP were calculated.

Results— Higher systolic BP (SBP) was associated with abnormal CT scans because of independent associations with chronic changes of leukoariosis (OR, 1.12; 95% CI, 1.05–1.17) and old infarction (OR, 1.12; 95% CI, 1.06–1.17) at baseline, and signs of visible infarction at day 10 (OR, 1.06; 95% CI, 1.00–1.13). A lower SBP was associated with signs of acute infarction (OR, 0.94; 95% CI, 0.89–0.99). Hemorrhagic transformation, dense middle cerebral artery sign, mass effect, and cerebral edema at day 10 were not independently associated with baseline BP.

Conclusion— Although high baseline BP is independently associated with a poor outcome after stroke, this was not shown to be through an association with increased hemorrhagic transformation, cerebral edema, or mass effect; trial design may be suboptimal to detect this. Higher SBP is associated with visible infarction on day 10 scans. The influence of changing BP in acute stroke on CT findings is still to be ascertained.

Key Words: acute stroke • CT • hypertension • ischaemia • outcome

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