如何掌握无症状性颈动脉杂音一直是一个有争论而又不易解决的课题.颈动脉杂音的部位应确定于颈中部下颌角后下方.需与生理性杂音、静脉杂音、动静脉瘘、动脉瘤、肱动脉、锁骨下动脉、椎动脉与颈动脉硬化引起的杂音相鉴别.一般动脉狭窄达50%时杂音增强,但当狄窄达85%至90％时杂音可能消失.根据Thompsor的统计:颈内动脉狭窄与真正可以听到杂音约为75%和85%之间,另一方面证实颈内动脉病变和出现杂音之间的关系约为 How to master asymptomatic carotid noise has been a controversial but not easy to solve the problem.Carotid artery site should be located in the neck below the mandibular angle after the need to physiological noise, venous noise, arteriovenous fistula, aneurysm , Brachial artery, subclavian artery, vertebral artery, and carotid atherosclerosis.Generally, the murmurs increase when the arterial stenosis reaches 50%, but the murmur may disappear when the Dizzy reaches 85% to 90%. According to Thompsor’s statistics, Internal carotid artery stenosis can actually be heard between about 75% and 85%, on the other hand confirmed the relationship between internal carotid artery lesions and the emergence of noise is about