renal backflow of contrast agent

例句：

1. 1. Thepatient's kidney function was severely impaireddue to the renal backflow of contrastagent.
   由于造影剂的肾反流，患者的肾功能严重受损。
2. 2. The procedureinvolved injecting acontrast agent into the renal systemto visualize the kidneys.
   该程序涉及将造影剂注入肾脏系统以可视化肾脏。
3. 3. The renal backflow of contrast agentcan cause severe pain and discomfort during theprocedure.
   造影剂的肾反流在手术过程中会引起剧烈的疼痛和不适。