Retrograde inspection vs standard forward view for the detection of colorectal adenomas during colonoscopy: A back-to-back randomized clinical trial

Table 1 Patient characteristics and withdrawal times in the standard forward view and retroflected view arm

	SFV arm		RFV arm
Patients, n (m/f)	88 (39/49)		88 (37/51)
Age, yr
mean	59.3 ± 15.2		59.9 ± 15.6
range	18-86		20-88
Withdrawal time (min)	1st SFV	2nd SFV	1st RFV	2nd RFV
Cecum & ascending colon	1:51 (1:05-2:27)	1:47 (0:42-2:25)	1:53 (1:27-2:17)	1:52 (0:50-2:17)
Transverse colon	1:46 (0:59-2:54)	1:49 (1:05-2:41)	1:50 (1:20-2:50)	1:44 (0:30-2:49)
Descending & sigmoid colon	2:36 (1:58-4:22)	2:30 (1:00-3:41)	2:23 (1:23-2:54)	2:29 (1:31-2:59)

RFV: Retroflected view; SFV: Standard forward view.

Table 2 Polyp detection rates and adenoma detection rates after first and second inspection in the standard forward view and retroflected view arm

	SFV arm	RFV arm	P value
PDR
1st Inspection	33/88 = 37.5%	35/88 = 39.8%	0.870
2nd Inspection	41/88 = 46.6%	41/88 = 46.6%	1.000
ADR
1st inspection	30/88 = 34.1%	31/88 = 35.2%	1.000
2nd inspection	39/88 = 44.3%	37/88 = 42%	0.8791

RFV: Retroflected view; SFV: Standard forward view; PDR: Polyp detection rate; ADR: Adenoma detection rate.

Table 3 Characteristics of the polyps detected during first and second inspection in the standard forward view and retroflected view arm

	SFV arm		RFV arm
	1st SFV	2nd SFV	1st SFV	2nd RFV
Adenoma size
< 5 mm	29	12	14	16
5-10 mm	19	16	31	17
> 10 mm	7	3	8	2
Adenoma localization
Cecum and ascending colon	18	9	21	11
Transverse colon	11	6	9	11
Descending and sigmoid colon	26	16	23	13
Histology
LGIEN	53	27	48	33
HGIEN	1	2	2	0
SSA wo dysplasia	1	1	2	2
SSA with dysplasia	0	1	1	0
Paris classification
Is	21	9	28	18
Ip	2	1	0	0
IIa	28	16	18	15
IIb	4	5	7	2

RFV: Retroflected view; SFV: Standard forward view; LGIEN: Low grade intraepithelial neoplasia; HGIEN: High grade intraepithelial neoplasia; SSA: Sessile serrated adenoma.