Safety and Efficacy of the Supine Position with the Right Shoulder Raised versus the Left Lateral Position in Peroral Endoscopic Myotomy for Achalasia: A Large-Sample Retrospective Study

Table 2

Comparisons of POEM-related parameters and adverse events between the two groups.

	Supine position with the right shoulder raised group ()	Left lateral position group ()	p value
Types of myotomy [n (%)]	—	—	0.087
Inner circular muscle incision	14 (2.4)	4 (3.2)	—
Circular muscle incision + balloon shaping	19 (3.3)	6 (4.9)	—
Glasses-type muscle incision	14 (2.4)	5 (4.1)	—
Progressive full-thickness myotomy	494 (85.3)	93 (75.6)	—
Full-thickness muscle incision	38 (6.6)	15 (12.2)	—
Operating time, mean (range) (min)	43.5 (17–180)	54.6 (22–170)	<0.001
Tunnel length, mean (range) (cm)	10.6 (4–20)	11.9 (7–26)	0.297
Myotomy length, mean (range) (cm)	—	—	—
Esophageal	5.0 (0–13)	4.7 (0–21)	0.108
Gastric	2.0 (0–4)	1.9 (0–3)	0.937
Total	7.0 (3–15)	6.6 (2–23)	0.103
All intraoperative adverse events [n (%)]	53 (9.2)	26 (21.1)	<0.001
Mucosal injury	9 (1.6)	2 (1.6)	1.000
Pneumothorax	6 (1.0)	2 (1.6)	0.927
Pneumoperitoneum	16 (2.8)	9 (7.3)	0.027
Pneumomediastinum	2 (0.3)	3 (2.4)	0.040
Subcutaneous emphysema	20 (3.4)	10 (8.1)	0.020
Fever (temperature > 38.0°C) [n (%)]	14 (2.4)	2 (1.6)	1.000