The evaluation of intracranial bypass patency in neurosurgical practice

BackgroundThe patency of cranial bypasses must be carefully evaluated during and after the microsurgical procedure. Although, several imaging techniques are used to evaluate the patency of bypasses, their findings are sometimes difficult to interpret.PurposeThe goal of this study was to assess the consistency of different diagnostic modalities for evaluating intracranial bypass patency.Patients and methodThis prospective study included 19 consecutive patients treated with EC-IC or IC-IC bypass for MoyaMoya disease (MMD) or complex/giant aneurysms between June 2016 and June 2018. In the early postoperative period (< 7 days), all patients had transcranial Doppler (TCD), CT angiography (CTA) and MRA to demonstrate patency of anastomoses and to confirm exclusion of the aneurysm. When findings of anastomosis patency differed between these techniques, conventional angiography was performed.ResultsAll anastomoses were patent on indocyanine green videoangiography at the end of microsurgical procedure. The results of noninvasive postoperative exams were consistent to demonstrate the patency of anastomoses in 13 patients. In 4 patients, a discrepancy in patency of anastomoses arose between TCD, CTA and MRI in the early postoperative period. In 2 other patients, the interpretation of bypass patency remained inconclusive before the decision to occlude the aneurysm. In these 6 patients, a significant edema was noted in 2 cases, a postoperative subdural hematoma in 1 case, a low flow in the anastomosis in 1 case and vasospasm in 2 cases. The anastomosis was patent on the conventional angiography in five patients.ConclusionNoninvasive imaging techniques provide useful data about the patency but their findings should be carefully interpreted due to local anatomical, physiological, and pathological factors. In case of discrepant findings, conventional angiography including supraselective catheterization of the donor vessel is suggested.     

脑动脉瘤栓塞疗法完美实施的基础

目的：探索栓塞疗法治疗脑动脉瘤达到理想结果的条件。方法：１９９６年４月至２０００年４月间栓塞治疗３３例动脉瘤患者。以球囊栓塞４例,以机械解脱式钨丝弹簧圈栓塞２０例,以电解脱式铂金弹簧圈栓塞９例。结果：闭塞载瘤动脉４例,１００％闭塞８例,９５％闭塞１５例,９０％闭塞６例。无手术并发症。随访（门诊或信访）３３例无再出血。造影随访８例,其中术后１个月复查造影的２例均保持术后栓塞程度,术后３个月复查的３例     

动脉瘤性蛛网膜下腔出血后脑积水

目的：探讨动脉瘤性蛛网膜下腔出血（ＳＡＨ）后脑积水的类型、ＣＴ表现和治疗原则。方法：回顾分析１９８４年６月至１９９７年１２月经手术治疗的２１例动脉瘤性ＳＡＨ后脑积水情况,分别对动脉瘤发生部位、大小、ＳＡＨ次数、Ｈｕｎｔ－Ｈｅｓｓ分级和临床症状进行了统计和分析。结果：治疗后良好１４例,轻残２例,重残２例,死亡３例。结论：脑积水是动脉瘤性ＳＡＨ后的常见并发症之一,对预后有直接的影响。急性梗阻性脑积水以脑室外引流治疗最为有效,慢性交通性脑积水的治疗以脑室腹腔分流为宜     

Pseudoaneurysm of the superficial femoral artery following accidental trauma: result of treatment by percutaneous stent-graft placement

Accidental trauma frequently involves the extremities, and can extend to involve their blood supply, causing exsanguinating hemorrhage and pseudoaneurysm in the involved blood vessel. This is traditionally managed by surgical repair. We report a case in which control of life-threatening hemorrhage and exclusion of a large, post-traumatic pseudoaneurysm in the superficial femoral artery was performed by a commercially available stent-graft, without complication. This treatment method may be a safe and effective alternative to surgery in selected patients. Received: 10 February 1998; Revision received: 31 March 1998; Accepted: 20 April 1998     

Metallurgical evaluation of the compatibility of surgical clips with their appliers

Summary Five aneurysm clips and their respective appliers (Heifetz, Vari-Angle, McFadden, Scoville, and Yaargil) were tested for the production of small metal shards that could provoke a foreign body reaction or increase the risk of a stresscorrosion failure. Pivot and Vari-Angle-McFadden clips produced numerous large shards, the Scoville clip produced a few fine shards, and the Yaargil and Heifetz clips produced none. Metal shard production due to cold metal transfer is attributed to the abrasive mechanical interaction between clips and appliers made from metals with different degrees of hardness.     

Magnetic resonance angiography compared to intra-arterial digital subtraction angiography in patients with subarachnoid haemorrhage

Summary In order to evaluate the sensitivity and specificity of magnetic resonance angiography (MRA) in spontaneous subarachnoid haemorrhage, 14 patients with recent haemorrhage verified by CT or lumbar puncture were investigated with both selective intra-arterial digital subtraction angiography (IA-DSA) and MRA by two independent teams, each having the same preangiographic information. The results were compared with each other and whenever possible (all positive cases except one) with those of surgical intervention. Seven patients were identified by MRA and IA-DSA as having a single aneurysm on the circle of Willis, 1 an aneurysm of the posterior inferior cerebellar artery 1 an aneurysm of the internal carotid artery (siphon) and 2 patients with two aneurysms on the circle of Willis. MRA and IA-DSA both failed to demonstrate aneurysms in 2 cases. Three patients had negative results on both methods and no surgical intervention was attempted. The aneurysms ranged from 0.3 to 1.5 cm in size. In most cases there was agreement between MRA and DSA, leading us to believe that, if the proper protocols are followed, MRA is a powerful alternative to other established methods in the detection of intracranial aneurysms. At this stage it will not replace IA-DSA prior to surgery, but the ability to obtain various projections using 3D MRA may improve surgical planning.     

A ruptured dissecting aneurysm of the anterior radiculomedullary artery caused by vertebral angiography

We report here a 54-year-old man with an aneurysm arising on a cervical anterior radiculomedullary artery. The aneurysm ruptured just after vertebral angiography for a vascular anomaly of the brain, and it appeared to be fusiform, with thrombosis following angiography. Considering the sequential radiological studies and clinical course, it was assumed to be a dissecting aneurysm caused by the angiography. MRI showed severe swelling of the cervical spinal cord and an infarct in the territory of the anterior spinal artery. The mechanism of this rare complication is discussed. Received: 29 March 1999 Accepted: 18 August 1999     

Combined endovascular therapy of ruptured aneurysms and cerebral vasospasm

We describe two patients with subarachnoid haemorrhage due to a ruptured intracranial aneurysm and severe symptomatic vasospasm. The aneurysm was occluded with detachable coils followed by intra-arterial infusion of papaverine to treat vasospasm as an one-stage procedure. There was significant resolution of the vasospasm. The long-term clinical outcome in one patient was excellent, the other still has minor deficits. Combined endovascular aneurysm therapy followed by intra-arterial spasmolysis with papaverine is a technically feasable therapeutic alternative in patients with symptomatic vasospasm. Received: 5 November 1999/Accepted: 12 July 2000     

33例椎-基底动脉瘤的临床观察

目的：探讨椎－基底动脉瘤治疗方法与预后关系。材料与方法：报告３３例椎－基底动脉瘤。动脉瘤破裂致ＳＡＨ１８例，动脉瘤直径从５ｍｍ到４５ｍｍ。其中９例行保守治疗。直接手术治疗中，９例夹闭术，２例瘤壁加固术。１３例行血管内栓塞治疗。结果：９例保守治疗中３例因再次出血死亡。１１例直接手术均痊愈。１３例血管内栓塞治疗后１～３个月后复查造影，闭塞率＞８０％者１２例。结论：椎－基底动脉瘤积极手术治疗可降低死亡率，依动脉瘤部位与大小采用不同手术入路至关重要，血管内栓塞治疗适于直接手术难以达到者，疗效肯定。     

MSCT血管成像在主动脉瘤诊断中的应用价值

目的:探讨MSCTA技术在主动脉瘤中的应用价值。方法:对9例主动脉瘤进行MSCT检查,然后进行图像后处理,包括多平面重组(MPR)、最大密度投影(MIP)、遮盖容积重建(SVR)、仿真内窥镜(VE)等多维重组技术进行血管的显示。结果:6例真性主动脉瘤,2例夹层动脉瘤和1例动脉瘤夹层支架置入,MPR的两维重建三维显示、VR和VE能够清晰而直观生动地显示动脉瘤的解剖细节及其与周围器官的空间解剖关系。结论:MSCT对主动脉瘤的诊断、分类和分型具有独特的优越性,对于选择治疗方法、观察疗效有重要的价值。