Retrospective Analysis of Ultrasound-Guided Infraclavicular Block: Effect of Experience of Anesthesiologists on Volume of Local Anesthetic Administered

Table 2

Comparison of local anesthetic volume (LAV) used and effectiveness of the ultrasound-guided infraclavicular brachial plexus block between groups I, II, III, and IV.

	Group I			Group II			Group III			Group IV			p
	Mean ± SD, n (%)		Median	Mean ± SD, n (%)		Median	Mean ± SD, n (%)		Median	Mean ± SD, n (%)		Median
Local anesthetic volume (ml)	33.7 ± 4.2		35	32.7 ± 4.1		30	32.4 ± 3.8		30	32.0 ± 4.0		30	0.000
LAV
≤30	305	48.6%		435	64.7%		471	70.1%		616	91.7%		0.000
>30	323	51.4%		237	35.3%		249	29.9%		317	8.3%
Result
Effective	608	96.8%		664	98.8%		715	99.3%		928	99.5%		0.000
Ineffective	20	3.2%		8	1.2%		5	0.7%		5	0.5%

Data were analyzed using the Kruskal–Wallis (Mann–Whitney U test) or chi-square test.