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Table 2 Absolute values and changes of somatic tissue oxygen saturation (SstO2) and cerebral tissue oxygen saturation (SctO2) at different time points (n = 26)

From: Tourniquet-induced tissue hypoxia characterized by near-infrared spectroscopy during ankle surgery: an observational study

  T0 Tend Tpost ΔTpost-0a ΔTpost-endb
SstO2-distal (%) 77.5 ± 7.7 15.6 ± 9.7 90.9 ± 4.0 13.8 ± 8.0* 75.4 ± 11.5*
SstO2-prox (%) 82.3 ± 6.1 81.1 ± 7.8 78.4 ± 7.3 −3.6 ± 4.5* −2.7 ± 2.3*
SstO2-contra (%) 81.2 ± 6.8 81.3 ± 10.0 78.3 ± 10.5 −5.6 ± 6.3* − 3.0 ± 3.2*
SctO2 (%) 77.5 ± 6.2 79.9 ± 7.9 80.1 ± 8.0 2.0 ± 6.3 0.2 ± 2.7
  1. SstO2-distal = SstO2 distal to the tourniquet; SstO2-prox = SstO2 proximal to the tourniquet; SstO2-contra = SstO2 on the contralateral leg; T0 = immediately before tourniquet insufflation; Tend = immediately before tourniquet deflation; Tpost = 3–5 min after tourniquet deflation
  2. *P < 0.001
  3. apaired Student's t-test between Tpost and T0
  4. bpaired Student's t-test between Tpost and Tend