**Abstract**

Aneurysmal subarachnoid hemorrhage (aSAH) is a devastating neurological condition and these patients often have unfavorable outcomes at the long-term follow-up. Poor-grade aSAH is a severe subtype of aSAH and is defined as World Federation of Neurosurgical Surgeon (WFNS) grade IV or V. All patients should be treated by a multidisciplinary team that consists of vascular neurosurgeons, interventional neuroradiologists, neurologists, and anesthetists. Aneurysm rebleeding occurs in the poor-grade aSAH within the first 72 h after ictus. Timing of treatment for aSAH has shifted from delayed to early treatment of ruptured aneurysms, and there will be a trend toward early or ultra-early treatment for poor-grade aSAH. However, there is no consensus regarding the optimal timing of treatment for poor-grade aSAH. Endovascular coiling has provided a viable alternative to surgical clipping. An increasing number of patients have received endovascular treatment. There are limited data on high-level clinical trials focused on the treatment of poor-grade aSAH. An accurate prediction model remains challenging. Predicting long-term outcome is essential to support treatment decision-making. We reviewed the current therapeutical management and prognosis of poor-grade aSAH.

**Keywords:** intracranial aneurysms, subarachnoid hemorrhage, poor-grade, treatment, prognosis
