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Table 3 Perioperative parameters regarding hidden blood loss

From: Hidden blood loss between percutaneous pedicle screw fixation and the mini-open Wiltse approach with pedicle screw fixation for neurologically intact thoracolumbar fractures: a retrospective study

 

PPSF

MWPSF

P value

Intraoperative blood loss (ml)

31.9 ± 9.6

44.0 ± 14.9

0.001

Preoperative Hb values (g/L)

142.3 ± 12.7

140.6 ± 13.5

0.46

Postoperative Hb values (g/L)

122.0 ± 13.0

123.0 ± 13.5

0.67

ΔHb (g/L)

20.3 ± 6.7

17.5 ± 6.4

0.021

Preoperative Hct values (%)

42.7 ± 3.7

41.8 ± 4.0

0.22

Postoperative Hct values (%)

38.3 ± 3.8

38.0 ± 4.0

0.63

Average Hct values (%)

40.5 ± 3.6

40.0 ± 3.9

0.38

PBV (L)

4.36 ± 0.61

4.17 ± 0.74

0.14

EBV (ml)

477.6 ± 228.8

401.0 ± 171.3

0.04

VBL (ml)

31.9 ± 9.6

44.0 ± 14.9

0.001

HBL (ml)

445.7 ± 228.9

357.0 ± 170.7

0.021

TBL (ml)

477.6 ± 228.8

401.0 ± 171.3

0.04

HBL %

91.2 ± 7.7

83.7 ± 22.9

0.02

  1. Data are represented as mean ± SD
  2. Hb haemoglobin, ΔHb Hb difference from preoperative to postoperative, Hct haematocrit, PBV patient’s blood volume, EBV estimated blood loss volume, VBL visible blood loss, HBL hidden blood loss, TBL, total blood loss, HBL%, the percentage of HBL