案例:小吴今年26岁,身高1.80米,偏瘦,平时偶而测血压偏低,但也没有不适感。近日与同学聚会,喝了不少啤酒,回家后觉得头重脚轻,倒在床上不久新睡着了。不知何时,他被尿憋醒,起床排尿时,竟在毫无先兆的情况下,突然晕倒在地。家人听到响声后,急忙赶到厕所,发现他平躺在瓷砖地上,面部朝下。大约10分钟后,小吴 Case: Xiao Wu is 26 years old this year, 1.80 meters tall, lean, usually measured blood pressure occasionally low, but no discomfort. Recently with his classmates, drank a lot of beer, go home and feel top-heavy, fell asleep in bed soon new. I do not know when he was awakened by the urine, get up urinating, actually in the absence of aura, suddenly fainted. After hearing the sound, the family hurried to the toilet and found him lying flat on the tile floor with his face down. About 10 minutes later, Xiao Wu