Analysis of colonoscopic perforations at a local clinic and a tertiary hospital

Table 1 Frequency of perforation depending on the type of endoscopic procedure

		Total	Diagnostic	Therapeutic	Polypectomy	EMR	ESD
Shirakawa Clinic between April 2006 and December 2010
Number	n	10  826	8201	2625	1609	885	131
Perforation	n (%)	8 (0.07)	0 (0)	8 (0.3)	1 (0.06)	2 (0.2)	5 (3.8)
Maebashi Red Cross Hospital between January 1996 and December 2010
Number	n	32  148	24  361	7787	5500	2244	43
Perforatio	(%)	9 (0.03)	3 (0.01)	6 (0.08)	1 (0.02)	4 (0.17)	1 (2.3)

EMR: Endoscopic mucosal resection; ESD: Endoscopic submucosal dissection.