Association between tourniquet use and intraoperative blood loss during below-knee amputation

Table 1 Demographic characteristics of patients undergoing below knee amputation with and without tourniquet

	No tourniquet	Tourniquet	P value
n	30	67
Age, mean (SD)	43.31 (18.53)	56.05 (14.02)	< 0.001
Gender = M (%)	19 (63.3)	43 (64.2)	1
Height (mean (SD))	1.73 (0.10)	1.75 (0.10)	0.423
Weight (mean (SD))	90.63 (31.57)	98.78 (32.46)	0.252
BMI (mean (SD))	29.96 (9.62)	32.12 (9.81)	0.315
Diabetes (%)	7 (23.3)	27 (40.3)	0.165
Hepatitis C (%)	0 (0.0)	4 (6.0)	0.415
Smoking (%)	6 (20.0)	26 (38.8)	0.112
IV drug use (%)	1 (3.3)	5 (7.5)	0.746
Alcoholism (%)	2 (6.7)	10 (14.9)	0.419
Outside hospital transfer (%)	3 (10.0)	13 (19.4)	0.391
ASA score (%)			0.433
1	1 (3.3)	0 (0.0)
2	12 (40.0)	20 (29.9)
3	15 (50.0)	40 (59.7)
4	2 (6.7)	6 (9.0)
5	0 (0.0)	1 (1.5)
Homeless (%)	0 (0.0)	1 (1.5)	1
Preoperative hemoglobin (mean (SD))	11.91 (2.64)	11.78 (2.74)	0.82
Platelets (mean (SD))	270.83 (153.50)	315.09 (114.02)	0.117
Indication for surgery (%)			< 0.001
Infection	14 (46.7)	53 (79.1)
Trauma	2 (6.7)	9 (13.4)
Tumor	14 (46.7)	5 (7.5)

BMI: Body mass index.

Table 2 Results of multivariate regression modeling

Variable	Estimate (95%CI)	P value
Tourniquet use	-488 mL (-857, -119)	0.01
Indication (vs infection)
Trauma	12 mL (-474, 498)	0.96
Tumor	-190 mL (-624, 245)	0.39

CI: Confidence interval.