A Randomized Study on the Effectiveness of Prophylactic Clipping during Endoscopic Resection of Colon Polyps for the Prevention of Delayed Bleeding

Table 1

The characteristics of the patients and lesions and the endoscopic factors in the clipping and nonclipping groups.

		Total	Bleeding	No bleeding	value
Numbers of lesions in male and female patients	Male	208	6	202	N.S.
	Female	80	1	79
Age (mean ± SE)		67.4 ± 10	62.4 ± 13	67.5 ± 10	N.S.
Anticoagulant drugs	+	8	0	8	N.S.
	−	280	7	273
Antiplatelet drugs	+	38	2	36	N.S.
	−	250	5	245
Location	Rectum	27	1	26	N.S.
	Others	261	6	255
	Cecum	19	0	19
	Ascending	54	1	53
	Transvers	70	3	67
	Descending	25	0	25
	Sigmoid	96	2	94
Morphology	Pedunculated	41	1	40	N.S.
	Sessile and flat	247	6	241
Size (cm)	<2	274	5	269
	≥2	14	2	12	<0.01
Pathology	Adenoma	273	5	268	N.S.
	Carcinoma	15	2	13
Method	EMR	234	5	229	N.S.
	Polypectomy	54	2	52
Exposed vessel	+	7	1	6	N.S.
	−	281	6	275
Length of procedure (mean ± SE)		413 ± 463	937 ± 1623	396 ± 360	<0.01
Specialists	+	177	3	174	N.S.
Less-experienced endoscopists	−	111	4	107

N.S.: not significant.
EMR: endoscopic mucosal resection.
Exposed vessel: obvious vessels in the ulceration after endoscopic resection.