Risk factors for haemorrhagic transformation in patients with acute ischaemic stroke receiving recombinant tissue plasminogen activator. ES, effect size; NIHSS, National Institute of Health stroke scale. Risk factors for haemorrhagic transformation in patients with acute ischaemic stroke receiving recombinant tissue plasminogen activator. ES, effect size; NIHSS, National Institute of Health stroke scale. Yijia Guo et al. Stroke Vasc Neurol 2018;svn-2018-000141 © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.