Monitoring salivary amylase activity is useful for providing timely analgesia under sedation

Table 1 Patient characteristics

	H-group	M-group	L-group	P value
No. of patients	14	8	19
Gender (male/female)	9/5	6/2	16/3	0.429
Age (yr)	71.5 ± 11.7	71.6 ± 8.9	69.9 ± 7.0	0.569
(range)	(40-84)	(58-86)	(58-81)
Body weight (kg)	57.3 ± 10.6	62.4 ± 10.0	58.8 ± 8.7	0.443
(range)	(43.1-82)	(49-80.3)	(44-76)
No. of tumors	14	8	19
Location U/M/L	1/5/8	0/2/6	3/6/10	0.464
Less, post/great, ant	9/5	3/5	10/9	0.485
Resected tumor size (mm)	29.0 ± 10.0	29.3 ± 12.7	30.2 ± 11.4	0.827
(range)	(15-49)	(17-58)	(12-50)
Procedure time (min)	78.0 ± 54.1	92.5 ± 55.9	73.7 ± 46.8	0.717
(range)	(35-240)	(35-200)	(20-205)

The data are presented as the mean ± SD. U: Upper third of the stomach; M: Middle third of the stomach; L: Lower third of the stomach; Less: Lesser curvature; Great: Greater curvature; Ant: Anterior wall; Post: Posterior wall.

Table 2 Body movement during salivary amylase activity elevation

	H-group	M-group	L-group	P value
No. of patients	14	8	19
No. of elevated sAMY (times)	26	30	16
≥ twice the actual value	26	11	0
< twice the actual value	0	19	16
with body movement	17	16	6	0.215 (10.078)
without body movement	9	14	10

¹Indicates a comparison between the H- and L-groups. sAMY: Salivary amylase activity.

Table 3 Technical status during salivary amylase activity elevation

	H-group	L-group	P value
No. of elevated sAMY (times)	26	16
Operative techniques
Incision	9	4	0.430
Dissection	11	10
Hemostasis	6	2
Endoscopic direction
Straight	12	6	0.582
Inversion	14	10
Forceful endoscopic insertion or over insufflation
Presence	22	9	0.042
Absence	4	7

sAMY: Salivary amylase activity.

Table 4 Interventions used to treat salivary amylase activity elevation and the improvement in terms of body movement [number of episodes of salivary amylase activity elevation/recovery rate of salivary amylase activity (%)]

Body movement	Presence	Absence
Number (times)	17	9
Release of gastric wall tension only	2/86.2	5/66.1
Medication (pentazocine injection) only	12/94.7	3/95.9
Release and medication (pentazocine)	2/119.6	0/-
Medication (midazolam or propofol injection) only	1/124.2	1/85.6

Recovery rate of sAMY (%) = (the elevated sAMY level-decreased sAMY level immediately after intervention)/the elevated sAMY level × 100. sAMY: Salivary amylase activity.