MR Imaging Analysis Of Neurovascular Compression Angle In Patients With Vestibular Paroxysmia

Background and ObjectiveVertigo is a kind of dynamic or positional illusion caused by the obstacle of the space position,Because of its serious impact on the quality of life of patients,Is one of the main causes of the patient's treatment,Vertigo in the Department of internal medicine, accounting for about 5%,Clinically benign positional vertigo (BPPV)? Meynier's disease?vestibular neurons?vestibular migraine and other more common.Vestibular disease (VP) intermittency due to its low incidence,VP accounts for about 4%of the vascular vertigo,the clinicians lack of a deep understanding of VP,The main manifestations of the VP was recurrent vertigo,The common symptoms of postural or gait balance disorders%tinnitus and hearing loss,There was a large difference in the frequency of seizures,Up to hundreds of times,Vertigo duration ranged from a few seconds to a few minutes,The provoke factors that induce vertigo include changes in the head or body position?resting state?specific postures,and so on. Ineffective for vestibular inhabitant drugs,The vp have a good effect for the antiepilepyic drugs such as carbamazepine which can significantly reduce the frequency of dizziness,vertigo duration and the severity of vertigo.When the drug treatment effect is not obvious or serious adverse reactions, Microvascular decompression is also a choice for clinical treatment, And it can obtain better effect.Hufner etc in 2008 developed the VP diagnostic criteria, One of the most important is the discovery of MRI vascular nerve entrapment into the diagnostic criteria.With the rapid development of high resolution magnetic resonance imaging technology, It makes a clear display of the fine structure of the posterior fossa, And it has important guiding function for the choice of operation mode.In recent years, At home and abroad, the literature on VP imaging showed a gradual increase, Make it a hot research topic, Location and degree of compression of responsible vascular compression of the vestibulocochlear nerve may have effects on the incidence of VP? However, there is no report on the relationship between the angle of vascular compression and the incidence of VP.In this study,based on the three dimensional time of flight magnetic resonance angiography analyze the incidence of vascular nerve compression?the responsible blood vessels?the compression type and discusses the angle between the vascular and vestibulocochlear how induce VP.MethodsCollect thirty patients with VP in our hospital from November 2013 to November 2014 were collected and thirty patients with vertigo were collected as control group, we us three dimensional-time of flight-MR angiography to find NVCC phenomenon. The frequency and the type of neurovascular cross-compression (NVCC), the source of the liability vessel and the angle between the blood vessel and Vestibulocochlear nervewere retrospective analysis between the two groups.ResultsThe frequency of NVCC was 93.3%in VP group, there were significant between VP group and vertigo group(x2=6.296, P=0.012,P<0.05), The most common NVCC type of compression was vascular loop compression in VP group(53.6%), there were no obvious differences in types of NVCC between the two groups (?~2=2.813, P=0.421,P>0.05). The most common offending vessel was anterior inferior cerebellar in VP group(76.7%), therewas no obvious difference in the origin of the offending vesselbetween the twogroups (P>0.05).In VP group, there were 24 patients(80.0%) that the angle was between 45°nd 135°hich has much higher than control group(12/30,40.0%, ?~2=10.000, P=0.002,P<0.05).Conclusions1.The incidence of vascular nerve interaction pressure (NVCC) was higher in.VP patients.2.The most common vascular compression of the vestibulocochlear nerve compression type was loop compression which is mainly trigered by anterior inferior cerebellar artery.3.With the increase of the angle between the responsibility of vascular and vestibulocochlear nerve,at 90 degrees, the maximum force is perpendicular to the direction of the force,The possibility of the incidence of VP between 45 degrees to 135 degrees in the angle between the vascular nerve.