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Sex Estimated total blood volume (L) Female =(0.3561 * Ht[m]3) + (0.03308 * Wt[kg]) + 0.1833 Male =(0.3669 * Ht[m]3) + (0.03219 * Wt[kg]) + 0.6041 Ht: height in meters. Ht[m]3: (height in meters)3. Wt: weight in kilograms
- Table 2
Characteristics and Baseline Hematologic Status of Patients who Underwent Posterior Spine Fusion for Adolescent Idiopathic Scoliosis.
Patients Tranexamic acid N=18 Mean (sd) No tranexamic acid N=18 Mean (sd) P value Females n (%) 16 (88.9) 15 (83.3) 0.63 Age (yrs.) 16.1 (3.1) 15.2 (3.4) 0.44 Body mass index (kg/m2) 22.2 (5.2) 20.2 (3.3) 0.19 Preoperative hemoglobin (g/ dL) 13.9 (1.3) 13.9 (1.1) 1.00 Estimated total blood volume (L)14 3.80 (0.89) 3.38 (0.48) 0.15 N: number, Yrs: years,kg/m2: kilograms per meter squared, g/dL: grams per deciliter, L: Liter.
- Table 3
Operative Factors and Blood-related Outcomes of Patients who Underwent Posterior Spine Fusion for Adolescent Idiopathic Scoliosis.
Tranexamic acid n=18 No tranexamic acid n=18 Variable Mean(sd) Median [range] Mean(sd) Median [range] Pvalue Number of levels fused 10.5 (2.2) 11.0 9.6(2.0) 10.0 0.21 Number of osteotomies 1.6 (2.5) [0-8] 0.9 (1.6) [0-5] 0.34 Duration of operation (hours) 6.1(1.1) 6.0 6.1(1.2) 6.3 1.00 Estimated blood loss (ml) 474 (382) 285 583 (316) 500 0.12 Est. blood loss/level fused (ml) 44 (31) 33 61(33) 46 0.06 Percent total blood volume lost 12.1(8.8) 8.23 17.3 (8.8) 14.30 0.03 Percent TBV lost/level fused 1.1(0.7) 1.0 1.8 (1.0) 1.0 tf3-10.05 TBV: total blood volume
↵* p=0.048, Bold = p<0.05, Est.: estimated, ml: milliliters