Web extra: ongoing research studies* [As supplied by authors]

• MASH: a randomised, placebo-controlled trial of the influence of intravenous magnesium on outcome after aneurysmal subarachnoid haemorrhage (s.m.dorhoutmees@umcutrecht.nl). ISRCTN68742385

• IMASH: a randomised, placebo-controlled trial of the influence of intravenous magnesium on outcome after aneurysmal subarachnoid haemorrhage (http://www.surgery.cuhk.edu.hk/imash-trial). NCT00124150

• A randomised, placebo-controlled trial of the influence of simvastatin on subarachnoid haemorrhage-induced vasospasm (cayata@partners.org). NCT00235963

• A randomised, placebo-controlled trial of the influence of systemic recombinant human erythropoietin on cerebral autoregulation and delayed ischaemic deficit following aneurysmal subarachnoid haemorrhage (pjk21@medschl.cam.ac.uk). NCT00140010

• CONSCIOUS-1: a randomised, placebo-controlled, parallel-group, dose-finding trial of clazosentan for the prevention of vasospasm following aneurysmal subarachnoid haemorrhage (peter.vajkoczy@nch.ma.uni-heidelberg.de). NCT00111085

• HELPS: a randomised trial of hydrocoils versus bare platinum in the endovascular coil treatment of intracranial aneurysms (http://www.helpstudy.org). ISRCTN30531382

• Cerecyte coil trial: a randomised trial of Cerecyte coils versus bare platinum in the endovascular coil treatment of intracranial aneurysms (andy.molyneux@nds.ox.ac.uk). ISRCTN82461286

^* Information obtained from the Current Controlled Trials metaRegister (http://www.controlled-trials.com/mrct) and the Stroke Trials Directory of the Internet Stroke Center (http://www.strokecenter.org/trials/). Either the International Standard Randomised Controlled Trial Number (ISRCTN) or the ClinicalTrials.gov Identifier (NCT) has been provided for each trial, if available.

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