Baseline characteristics of the 4011 patients recruited into the ‘Efficacy of Nitric Oxide in Stroke’ (ENOS) trial.

ENOS Investigators; (2014) Baseline characteristics of the 4011 patients recruited into the ‘Efficacy of Nitric Oxide in Stroke’ (ENOS) trial. International journal of stroke, 9 (6). pp. 711-720. ISSN 1747-4930 DOI: 10.1111/ijs.12308
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BACKGROUND: High blood pressure is common in acute stroke and associated with a worse functional outcome. Many patients who present with acute stroke are taking prescribed antihypertensive therapy before their stroke. AIMS: ENOS tested whether lowering blood pressure and continuing pre-stroke antihypertensive therapy are each safe and effective. METHODS: This study is an international multi-centre prospective randomized single-blind blinded-endpoint parallel-group partial-factorial controlled trial of transdermal glyceryl trinitrate(a nitric oxide donor, given for seven-days) vs. no glyceryl trinitrate, and of continuing vs. stopping (temporarily for seven-days) pre-stroke antihypertensive drugs if relevant, inpatients with acute ischaemic stroke or intracerebral haemorrhage and high systolic blood pressure (140–220 mmHg). RESULTS: Recruitment ran from July 2001 to October 2013. Four thousand eleven patients [2097 (52·3%) in the continue/stop arm] were recruited from 173 sites across 23 countries in 5 continents (Asia 14%, Continental Europe 16%, UK 64%). Baseline characteristics include: mean age 70 (standard deviation 12) years; male 57%; mean time from stroke to recruitment 26 (13) h; mean severity (Scandinavian Stroke Scale) 34(13) of 58; mean blood pressure 167 (19)/90 (13) mmHg; ischaemic stroke 83%; and intracerebral haemorrhage 16%. The main trial results will be presented in May 2014. The results will also be presented in updated Cochrane systematic reviews and included in individual patient data meta-analyses of all relevant randomized controlled trials. CONCLUSION: ENOS is a large completed international trial of blood pressure management in acute stroke and includes patients representative of many stroke services worldwide.

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