缺血性卒中是西方国家的第三大死因，尽管做了大量的调查，但仍有４０％的缺血性卒中患者病因不清。已有报道青年不明原因卒中患者右向左分流的发生率较高，但在非选择性急性卒中人群中的情况还不清楚。该研究的目的是确定在非选择性人群中右向左分流的大小与卒中危险度的... Ischemic stroke is the third leading cause of death in Western countries, and despite a large number of investigations, 40% of patients with ischemic stroke remain elusive. It has been reported that young patients with unexplained stroke have a higher incidence of right-to-left shunting, but the situation is not yet clear in non-selective acute stroke populations. The purpose of this study was to determine the size of the right-to-left shunt and the risk of stroke in a non-selective population.