Pain and Efficacy Rating of a Microprocessor-Controlled Metered Injection System for Local Anaesthesia in Minor Hand Surgery

Table 2

Results for comparison of primary outcome measure (VAS) using single-sided t-test for visual analog scales 0–100 mm. See Table 1 for questions.

	Microprocessor-controlled injection	Traditional method of injection	𝑃 value
	𝑛=20 [Mean (SD)]	𝑛=20 [Mean (SD)]
Question  1	22 (23)	29 (22)	.34
Question  2	18 (22)	26 (23)	.30
Question  3	8 (17)	9 (9)	.95
Question  4	4 (9)	6 (10)	.49
Question  5	29 (36)	34 (29)	.65
Question  6	13 (17)	15 (16)	.67
Question  7	11 (15)	12 (13)	.75
Volume of anesthetic used	3.4 (0.1)	5 (2)	.0002
Total injection time (seconds)	248 (39)	156 (54)	<.0001