目的　探讨不明原因的蛛网膜下腔出血 (SAH)患者重复脑血管造影的益处和危险性。方法　回顾分析 14 0例SAH患者 15 4次 (首次 14 0例 ,重复 14例 )脑血管造影的结果及其并发症。结果　首次造影发现动脉瘤 10 7例 ( 76%) ,烟雾症 2例 ,血管畸形 1例。 14例重复脑血管造影检查时发现前交通动脉瘤 1例 ;12例进行了脑、脊髓MRI扫描 ,发现丘脑、脊髓血管畸形各 1例、全部15 4次造影检查中 ,术后 8h内死亡 1例 ,脑梗死 1例 ,血管痉挛 6例 ,穿刺点感染 2例 ,并发症比例 4 2 %( 10 /15 4)。结论　首次脑血管造影检查时 ,若技术及设备优良 ,拍片仔细 ,结合CTMRI检查及临床特点 ,则重复造影不必进行 ;当首次造影结果无可靠 ,伴有脑血管痉挛或再出血者 ,重复脑血管造影才是合理的 Objective To investigate the benefits and risks of repeat cerebral angiography in patients with unexplained subarachnoid hemorrhage (SAH). Methods A retrospective analysis of 150 cases of SAH patients 15 4 times (the first 140 cases, repeated 14 cases) the results of cerebrovascular angiography and complications. Results The first angiography showed 107 aneurysms (76%), 2 cases of smog and 1 case of vascular malformations. One case of anterior communicating aneurysm was found in 14 cases of repeat cerebral angiography. MRI scan of brain and spinal cord was performed in 12 cases. One case of vascular malformation was found in thalamus and spinal cord. All 15 cases were sacrificed within 8 hours after operation Cases, cerebral infarction in 1 case, vasospasm in 6 cases, puncture point infection in 2 cases, complication rate of 42% (10/154). Conclusions For the first time of cerebral angiography, if the technique and equipment are fine, the film is carefully taken, combined with CTMRI examination and clinical features, the repeat angiography does not have to be performed. When the first angiography results are unreliable, with cerebral vasospasm or rebleeding, repeat cerebrovascular Contrast is reasonable