Usefulness of the Hook knife in flexible endoscopic myotomy for Zenker’s diverticulum

Table 1 The Dakkak and Bennett score of dysphagia[7]

Grade 0	No dysphagia
Grade 1	Solids
Grade 2	Semi-solids
Grade 3	Liquids
Grade 4	Aphagia

Table 2 Patient characteristics n (%)

Characteristics
Variable	n = 24
Male	18 (75)
Median age (yr)	77
Mean time from onset of symptoms (mo)	18.5
Dysphagia score before treatment
Grade 1	6 (25)
Grade 2	7 (29)
Grade 3	10 (42)
Grade 4	1 (4)
Weight loss	11 (46)
Mean size of diverticula (cm ± SD)	3.0 ± 1.63

Table 3 Dysphagia score before treatment and at end-of-follow-up

Before treatment	End of the follow-up period
	0	1	2	3
1	n = 6	n = 0	n = 0	n = 0
2	n = 7	n = 0	n = 0	n = 0
3	n = 7	n = 1	n = 1	n = 1
4	n = 1	n = 0	n = 0	n = 0
Total	21	1	1	1