The esophagus vascular structures were examined with endoscopy and miniature ultrasonic probe and azygos blood flow (AzBF) measured with color doppler ultrasonography at right supraclavicular fossae.

• 运用微探头超声检查治疗前后食管下段静脉结构的情况，彩色多普勒超声检测奇静脉血流动力学方面的改变，进行前后对比研究。