岩静脉保护在听神经瘤手术中的临床意义
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摘要
目的:探讨听神经瘤手术中岩静脉保护的临床意义。
     方法:以2009年1月-2011年7月施行的听神经瘤显微手术患者共149例为观察对象。详细回顾研究了岩静脉未保留的患者临床资料特点。采用回顾性研究方法分析对比了岩静脉保留组和未保留组的患者临床资料。同时回顾性研究了听神经瘤术后再次后颅窝减压的7例患者的临床资料特点。
     结果:149例患者中岩静脉保留完整141例,保留率达94.6%。
     岩静脉未能保留患者(以下简称前者)平均年龄为43.5岁,岩静脉保留患者(以下简称后者)平均年龄46岁;前者男女各4例,后者男性50例,女性84例;前者病程平均6.8年,后者病程平均3.8年;前者肿瘤最大径平均46mm,后者肿瘤最大径平均38.6mm;前者肿瘤囊性变为主者仅1例,后者肿瘤囊性变为主有27例。前者术后复查见术区血肿发生为(4/8),小脑水肿发生为(5/8),小脑出血发生为(3/8),1例患者行后颅窝减压。无患者行侧脑室外引流,术后平均住院14天;后者术后复查发现术区血肿40例,小脑水肿56例,小脑出血12例,行后颅窝减压6例,行脑室外引流2例,术后平均住院天数10.6天。
     统计分析两组之间在发生术区血肿和小脑水肿的几率无显著性差异。统计分析显示岩静脉保留组和未保留组的小脑出血发生率有显著性差异。多因素分析显示岩静脉保留是缩短住院天数的保护性因素。
     后颅窝减压的7例患者平均年龄为47.6岁,男3例女4例,病程平均4.0年,肿瘤最大径平均40.7mm,肿瘤囊性变为主者0例。术后复查见术区血肿发生为(6/7),小脑水肿发生为(7/7),小脑出血发生为(5/7)。6例患者岩静脉保留。术后平均住院14天。
     结论:在听神经瘤手术中,应尽可能对岩静脉进行良好的保护,在目前显微外科技术条件下可以得到良好的保护。保护好岩静脉可能减少小脑出血的发生几率,同时可能会缩短术后住院时间。
     一旦未能保留岩静脉,手术中及时扩大缝合硬脑膜甚至敞开硬脑膜,扩大骨窗减压,若小脑外侧份肿胀明显伴挫伤,可考虑切除部分外侧小脑减压,手术后严密观察病情变化,积极做好再次后颅窝减压的准备。
     听神经瘤术后再次行后颅窝减压的主要原因是小脑出血、术区血肿和小脑水肿。建议后颅窝减压指征应适当放宽,才可能减少后颅窝高压引起的枕骨大孔疝致患者突发呼吸停止的死亡。预防措施则是术中注意保护小脑引流静脉和小脑组织,手术结束时彻底止血,术后常规复查CT争取第一时间发现异常。
Objective:To investigate the clinical significance of the protection of petrosal vein in the acoustic neuroma surgery.
     Methods:From January2009to July2011, a total of149acoustic neuroma microsurgical cases were observed. Detail characteristics of clinical data with the petrosal vein without retained cases were reviewed. The retrospective study compared the characteristics of clinical data of petrosal vein without retention group with retention group. Retrospective study of characteristics of clinical data of whom performed second posterior fossa decompression after acoustic neuroma microsurgery were conducted.
     Results:149patients with intact petrosal vein in141cases, the retained rate of94.6%.
     Petrosal vein failed to retain patients (hereinafter referred to as the former), the average age of43.5years, petrosal vein to retain patients (hereinafter referred to as the latter), mean age46years; four cases of the former men and women, the latter50cases of male, female84cases; the former course of the disease with an average of6.8years, the latter course of disease with an average of3.8years; the former tumor average diameter of46mm, the latter tumor size average of38.6mm; only one case of the former tumor cystic mainly,27cases of the latter tumors cystic mainly. Reexamination after the operation former see cerebelepontine angle(CPA) hematoma occurred (4/8), cerebellar edema (5/8), cerebellar hemorrhage (3/8),1patient underwent posterior fossa decompression. No patient with lateral ventricle drainage, postoperative hospital stay of14days; the latter found after the surgery CPA hematoma40cases, and cerebellar edema in56cases and cerebellar hemorrhage in12cases,6cases performed posterior fossa decompression, lateral ventricular drainage two cases, the average postoperative length of hospital stay was10.6days.
     The statistical analysis between the two groups there was no significant difference in the probability of occurrence of CPA hematoma and cerebellar edema. The statistical analysis show there was significant difference of the incidence of cerebellar hemorrhage between petrosal vein retention group and without retain group. Multivariate analysis show petrosal vein reservation was a protective factor for shorter hospital stay.
     Posterior fossa decompression in seven cases with an average age of47.6years,3males and4females, average disease duration of4.0years, an average of40.7mm maximum tumor size, no cystic tumor. After operation CPA hematoma occured (6/7), cerebellar edema (7/7), cerebellar hemorrhage (5/7). Six cases of patients with petrosal vein reserved. The mean postoperative hospital stay was14days.
     Conclusion:In acoustic neuroma surgery, the petrosal vein should be well protected under current microsurgical techniques. Protect the petrosal vein may reduce the risk of cerebellar hemorrhage. Also May shorten the postoperative hospital stay.
     Once the failure to retain the petrosal vein, the timely expansion of the sutured dura after surgery or even open the dura, to expand the bone window for decompression, if the cerebellum swelling significantly associated with contusion, removal of part of the lateral cerebellar for decompression may be considered, intensive observed after surgery, and actively prepared for second posterior fossa decompression.
     The postoperation decompression of posterior fossa in acoustic neuroma cases were mainly due to cerebellar hemorrhage, CPA hematoma and cerebellar edema. Proposed the indications of posterior cranial fossa decompression should be appropriate to widen, as the high pressure in posterior fossa could cause the urgent foramen magnum hernia lead to sudden respiratory arrest which may cause sudden death of patients. Precautionary measures to protect cerebellar draining veins and cerebellum tissue, and intraoperative complete hemostasis, also postoperative routine CT scan could discover abnormality timely.
引文
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