Abstract：
Posterior circulation stroke can present with dizziness/vertigo without other general neurological symptoms or signs, making it difficult to detect, and missed stroke can deteriorate. Therefore, a sign that can be easily identified during an examination would be helpful to improve the detection of this type of stroke.
The objective of this review is to highlight an ocular sign that is seen in posterior circulation strokes called ocular lateral deviation (OLD). OLD is mostly seen in dorsolateral medullary strokes, and it is also seen in pontine and cerebellar strokes. OLD is detected by asking a patient to look straight ahead and then briefly close their eyes. Upon re-opening their eyes, the examiner will see that the eyes have deviated to one side; the patient\'s eyes will then make corrective saccade(s) to return to looking straight ahead. Complete eye deviation is a central sign of posterior circulation stroke.
OLD is an under-recognized vestibular ocular sign of central vestibulopathies including posterior circulation stroke. The most common location is in the dorsolateral medulla, where one-third of such strokes have complete OLD. Eye deviation can also be appreciated on computed tomography or magnetic resonance imaging. OLD can be detected up to 6 months after a posterior circulation stroke.
Checking for the sign of complete eye deviation in patients with dizziness/vertigo could be a simple, quick method for detecting posterior circulation stroke, and a means to improving the patients\' outcome.
The objective of this review is to highlight an ocular sign that is seen in posterior circulation strokes called ocular lateral deviation (OLD). OLD is mostly seen in dorsolateral medullary strokes, and it is also seen in pontine and cerebellar strokes. OLD is detected by asking a patient to look straight ahead and then briefly close their eyes. Upon re-opening their eyes, the examiner will see that the eyes have deviated to one side; the patient\'s eyes will then make corrective saccade(s) to return to looking straight ahead. Complete eye deviation is a central sign of posterior circulation stroke.
OLD is an under-recognized vestibular ocular sign of central vestibulopathies including posterior circulation stroke. The most common location is in the dorsolateral medulla, where one-third of such strokes have complete OLD. Eye deviation can also be appreciated on computed tomography or magnetic resonance imaging. OLD can be detected up to 6 months after a posterior circulation stroke.
Checking for the sign of complete eye deviation in patients with dizziness/vertigo could be a simple, quick method for detecting posterior circulation stroke, and a means to improving the patients\' outcome.
摘要：
背景：后循环中风可表现为头晕/眩晕，而无其他一般神经系统症状或体征，使其难以检测，错过中风会恶化。因此,在检查过程中可以很容易识别的标志将有助于改善对这种类型中风的检测。
目的：本综述的目的是强调在后循环中风中看到的一种眼部体征，称为眼外侧偏斜（OLD）。老年多见于髓背外侧卒中，也见于脑桥和小脑中风。通过要求患者直视前方，然后短暂闭上眼睛来检测OLD。一旦重新睁开眼睛，检查者会看到眼睛已经偏离一侧;然后病人的眼睛会做纠正扫视（S）回到直视前方。眼睛完全偏离是后循环中风的中心标志。
结论：OLD是中央前庭病变包括后循环卒中的前庭眼部体征。最常见的位置是在延髓背外侧，其中三分之一的笔划完全变老了。眼睛偏差也可以在计算机断层扫描或磁共振成像上被理解。可以在后循环中风后6个月内检测到OLD。
结论：检查头晕/眩晕患者的眼睛完全偏离的迹象可能很简单，快速检测后循环中风的方法，以及改善患者预后的手段。
目的：本综述的目的是强调在后循环中风中看到的一种眼部体征，称为眼外侧偏斜（OLD）。老年多见于髓背外侧卒中，也见于脑桥和小脑中风。通过要求患者直视前方，然后短暂闭上眼睛来检测OLD。一旦重新睁开眼睛，检查者会看到眼睛已经偏离一侧;然后病人的眼睛会做纠正扫视（S）回到直视前方。眼睛完全偏离是后循环中风的中心标志。
结论：OLD是中央前庭病变包括后循环卒中的前庭眼部体征。最常见的位置是在延髓背外侧，其中三分之一的笔划完全变老了。眼睛偏差也可以在计算机断层扫描或磁共振成像上被理解。可以在后循环中风后6个月内检测到OLD。
结论：检查头晕/眩晕患者的眼睛完全偏离的迹象可能很简单，快速检测后循环中风的方法，以及改善患者预后的手段。
