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Table 3 Association of representative variables of tissue oxygenation with variables of resaturation and hyperemia following tourniquet deflation (n = 26)

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

Variable Resaturation magnitude (∆Tpost-end) Resaturation rate (%/second) Hyperemic response (∆Tpost-0)
R value P value R value P value R value P value
Baseline oxygenation (T0) 0.02 0.92 −0.01 0.95 −0.87 < 0.001
Maximal hypoxia (Tend) −0.94 < 0.001 0.43 0.03 −0.19 0.34
Hypoxic duration 0.26 0.20 −0.17 0.41 0.41 0.04
Hypoxic load (AUC) 0.66 < 0.001 −0.08 0.70 0.09 0.68
  1. T0 = immediately before tourniquet insufflation; Tend = immediately before tourniquet deflation; Tpost = 3–5 min after tourniquet deflation. ∆Tpost-end = difference between tissue oxygenation immediately before and after tourniquet deflation; ∆Tpost-0 = difference between tissue oxygenation immediately after tourniquet deflation and before tourniquet inflation (baseline); AUC = area under curve