In our multicentre , partial-factorial trial , we randomly assigned patients admitted to hospital with an acute ischaemic or haemorrhagic stroke and raised systolic blood pressure ( systolic 140-220 mm Hg ) to 7 days of transdermal glyceryl trinitrate ( 5 mg per day ) , started within 48 h of stroke onset , or to no glyceryl trinitrate ( control group ) .