Peroral endoscopic myotomy for achalasia and patients with normal lower-esophageal-sphincter integrated relaxation pressure: A propensity-score-matched retrospective study

Table 2 Comparisons of procedure-related parameters, n (%)

	Normal LES-IRP group (n = 71)	Increased LES-IRP group (n = 410)	P value
ASA classification			0.328
I	6 (8.5)	62 (15.1)
II	64 (90.1)	342 (83.4)
III	1 (1.4)	6 (1.5)
Operation time, median (Q1-Q3) (minute)	40.0 (33.0-51.0)	42.0 (32.0-55.0)	0.519
Tunnel length, median (Q1-Q3) (cm)	12.0 (9.0-12.0)	12.0 (10.0-12.0)	0.738
Myotomy length, median (Q1-Q3) (cm)	7.0 (5.0-9.0)	7.0 (6.0-9.0)	0.661
Types of myotomy			0.425
Inner circular muscle myotomy	7 (9.9)	70 (17.1)
Full-thickness muscle myotomy	3 (4.2)	30 (7.3)
Partial-thickness muscle myotomy	4 (5.6)	19 (4.6)
Glass-style anti-reflux myotomy	1 (1.4)	9 (2.2)
Progressive full-thickness myotomy	56 (78.9)	282 (68.8)
Intraoperative adverse events	5 (7.0)	58 (14.2)	0.186
Bleeding	1 (1.4)	2 (0.5)
Mucosal injury	3 (4.2)	29 (7.1)
Gas-related adverse events	1 (1.4)	27 (6.6)
Pneumothorax	0 (0.0)	1 (0.2)
Pneumoperitoneum	1 (1.4)	13 (3.2)
Pneumomediastinum	0 (0.0)	2 (0.5)
Subcutaneous emphysema	0 (0.0)	11 (2.7)

Data were expressed as median (Q1-Q3) or n (%). Continuous variables were compared by Mann-Whitney U test. Categorical variables were compared by χ² test or Fisher exact test. ASA classification: American Society of Anesthesiologists classification; Q1: First quartile; Q3: Third quartile; LES-IRP: Lower esophageal sphincter integrated relaxation pressure.