The problem: The procedure requires fasting, consumption of powerful laxaties, anaesthesia and the insertion of a optical scope in the rectum. It also carries the risk of a punctured colon.
The problem: The procedure requires fasting, consumption of powerful laxaties, anaesthesia and the insertion of a optical scope in the rectum. It also carries the risk of a punctured colon.
问题在于：筛查过程要求快速，需要在麻醉下将强缓泻剂从光镜一并置入直肠，且具有结肠穿孔风险。