Research based on the global burden of disease study from 1990 to 2021 is being used to predict future trends in ischemic stroke. However, the focus of the research appears to be unclear, with some studies examining stroke and its subtypes, while others look at related conditions such as migraine and subarachnoid hemorrhage. Various regions and populations are being studied, including asia, the us, and specific age groups, with some studies providing projections up to 2035 or 2050.