Williamson T H, Baxter G M, Dutton G N
Tennent Institute of Ophthalmology, Western Infirmary, Glasgow, UK.
Ophthalmology. 1993 Mar;100(3):312-7. doi: 10.1016/s0161-6420(93)31649-0.
Color Doppler velocimetry allows simultaneous imaging by B-scan and Doppler ultrasound. This facilitates estimation of blood velocity in the orbital vessels. A pulse arterial waveform providing blood velocity measurements can be obtained from the optic nerve head. The vascular pattern in this region consists of multiple peripapillary blood vessels and a central artery. The exact contribution of the arteries in this area to velocimetry readings was undetermined.
In this study, the arterial pulses at the optic nerve head of seven patients with central retinal artery occlusion (CRAO) and seven with anterior ischemic optic neuropathy (AION) were examined by color Doppler velocimetry.
No velocimetric measurements were obtainable at the optic nerve head in three of four patients with acute CRAO (examined within 24 hours of onset) despite color recordings obtainable in the peripapillary region. In contrast, all patients with AION showed characteristic arterial pulse waveforms from the artery that was situated centrally in the optic nerve. No peripapillary color indices were detectable in three of the four patients with ischemic optic neuropathy who were examined within 24 hours of onset of their symptoms. Follow-up investigation showed that there was reperfusion of both arterial circulations within 1 week.
The results demonstrate that color Doppler ultrasound of the optic nerve head provides velocimetric measurements of blood flow in the central retinal artery. Although some investigators using different apparatuses have produced velocimetry measurements from the posterior ciliary arteries, in this study reliable measurements were not obtainable form color indices in the peripapillary area.
彩色多普勒测速技术可通过B超和多普勒超声同时成像。这有助于估计眼眶血管中的血流速度。可以从视神经乳头获得提供血流速度测量值的脉冲动脉波形。该区域的血管模式由多个视乳头周围血管和一条中央动脉组成。该区域动脉对测速读数的确切贡献尚不确定。
在本研究中，通过彩色多普勒测速技术检查了7例视网膜中央动脉阻塞（CRAO）患者和7例前部缺血性视神经病变（AION）患者视神经乳头处的动脉搏动。
4例急性CRAO患者（在发病24小时内检查）中有3例在视神经乳头处无法获得测速测量值，尽管在视乳头周围区域可获得彩色记录。相比之下，所有AION患者均显示出位于视神经中央的动脉的特征性动脉搏动波形。4例缺血性视神经病变患者中有3例在症状发作后24小时内接受检查，未检测到视乳头周围的彩色指数。随访调查显示，两种动脉循环在1周内均有再灌注。
结果表明，视神经乳头的彩色多普勒超声可提供视网膜中央动脉血流的测速测量值。尽管一些使用不同设备的研究人员已从睫状后动脉获得了测速测量值，但在本研究中，无法从视乳头周围区域的彩色指数获得可靠的测量值。
