Stroke, the second leading cause of death worldwide (Ingall, 2004), is one of the major causes of morbidity and mortality. Intracerebral hemorrhage (ICH), a lethal type of stroke, accounts for 20% of all strokes (Qureshi et al., 2001), and occurs in about 50-60% of Asians (Inagawa, 2002). In order to understand the disease process, three animal model of ICH have been used to study the pathophysiology and treatment of ICH, including the microballoon model, the bacterial collagenase injection model (Rosenberg et al., 1990) and the autologous blood injection model (Andaluz et al., 2002; Belayev et al., 2003). In the collagenase injection model, the hemorrhage size is controllable which was induced by small vessel breakdown. This model also can mimic the onset of spontaneous intraparenchymal bleeding and the expansion of continuous bleeding in ICH patients (Kazui et al., 1996; MacLellan et al., 2008; James et al., 2008). In the past several years, our previous studies have proven that our modified collagenase IV injection model is a reliable and reproducible model of ICH in rat (Lu et al., 2014; Gao et al., 2014; Wang et al., 2011). We hereby introduce our model of ICH as following.
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