Ling classification describes endoscopic progressive process of achalasia and successful peroral endoscopy myotomy prevents endoscopic progression of achalasia

Table 3 Demographics and treatment outcomes of the 21 patients with a post-peroral endoscopic myotomy follow-up for > 2 years n (%)

Characteristic	Value
Sex, female/male (n)	9/12
Age (yr), mean (range)	43.8 (16-62)
Duration of symptoms (mo), median (range)	36 (6-120)
Endoscopic follow-up (mo), mean (range)	37.8 (24-51)
Manometry follow-up rate	19 (90.5)
Lower esophageal sphincter pressure (mmHg), mean (range)
Pre-treatment	34.6 (15.3-59.4)
Post-treatment	15.0 (2.1-21.6)
Ling classification
I	8 (38.1)
IIa	7 (33.3)
IIb	5 (23.8)
IIc	0 (0)
III	1 (4.8)
Treatment success rate (Eckardt score ≤ 3)	21 (100)