Evaluating long-term attachment of two different endoclips in the human gastrointestinal tract

Table 1 Clip retention rates over three periods

Period	Period 1		Period 2						Period 3
Evaluation	During 2nd endoscopy (before HDRBT, after EBRT)		Images after wk 1 (During HDRBT)		Images after wk2 (during HDRBT)		Images after wk 3 (during HDRBT)		During 3rd endoscopy (after HDRBT)
Patient	Quickclip (visualized/placeda)	Resolution (visualized/placeda)	Quickclip (visualized/placedb)	Resolution (visualized/placedb)	Quickclip (visualized/placedb)	Resolution (visualized/placedb)	Quickclip (visualized/placedb)	Resolution (visualized/placedb)	Quickclip (visualized/placedc)	Resolution (visualized/placedc)
1	0/1	0	2/5	0	1/5	0	1/5	0	0/1	0
2	4/11	0	7/7	0	6/7	0	6/7	0	0/6	0
3	0	0	1/1	1/1	1/1	1/1	1/1	1/1	1/1	1/1
4	2/2	1/1	2/2	0/1	2/2	0/1	2/2	0/1	0/2	0
5	0/1	0/1	no images	no images	no images	no images	no images	no images	0/2	0/1
6	0/1	1/1	2/2	1/1	2/2	1/1	2/2	1/1	0/2	0/1
7	0	1/1	0	1/1d	-	-	-	-	-	-
8	0/2	0/1	1/1	1/1	0/1	1/1	no images	no images	0	0/1
9	1/2	1/1	1/2	1/1	0/2	1/1	0/2	1/1	0	1/1
Total	7/20 (35%)	4/6 (67%)	16/20e (80%)	5/6e (83%)	12/20 (60%)	4/5 (80%)	12/19 (63%)	3/4 (75%)	1/14 (7%)	2/5 (40%)

^a“Placed” includes those clips placed during the first endoscopy;

^b“Placed” includes those clips that were placed at the 2nd endoscopy but also those (7 Quickclips and 4 Resolution) that were still attached from the 1st endoscopy;

^c“Placed” are the number of clips at last visualization in period 2 (for patient 5 this is during placement during period 2);

^dThis patient died due to a sudden cardiac arrest during the HDRBT;

^eDue too missing images of patient 5, the 2 placed Quickclips and 1 Resolution clip were excluded from the analysis in the corresponding period; EBRT: external beam radiotherapy; HDRBT: high dose rate brachytherapy.