Objective To design a vectorcardiography(VCG) monitoring apparatus at low cost,with good quality,and easy operation for gastroscopy, and to evaluate its effects in the procedure.

• 目的 将一种造价低、性能好、操作简便、适合胃镜检查的持续性心电向量图 (VCG)缺血监护设备 ,试用于胃镜检查者 ,评价其作用与效果。