Clinical reliability and utility of skin perfusion pressure measurement in ischemic limbs—Comparison with other noninvasive diagnostic methods

Relationship between skin perfusion pressure (SPP) and ankle blood pressure (ABP) (A; n = 351), SPP and toe blood pressure (TBP) (B; n = 367), and SPP and transcutaneous oxygen pressure (tcPO₂) (C; n = 380). There was a linear correlations between SPP and ABP (P < .0001, r = 0.748), SPP and TBP (P < .0001, r = 0.853), and SPP and tcPO₂ (P < .0001, r = 0.0620).

ROC curve for the threshold of each examination. Cut-off values: ankle blood pressure (ABP), 80 mm Hg; toe blood pressure (TBP), 30 mm Hg; SPP, 40 mm Hg; and transcutaneous oxygen pressure (tcPO₂), 30 mm Hg. The measurement of SPP was more reliable than the measurements of ABP, TBP, and tcPO₂.

Relationship between skin perfusion pressure (SPP) and ankle blood pressure (ABP) (A; n = 73), SPP and toe blood pressure (TBP) (B; n = 64), and SPP and transcutaneous oxygen pressure (tcPO₂) (C; n = 93) in healed and unhealed lesions. ○ healed, ● unhealed There was a significant correlation between SPP and ABP (P <.001, r = 0.646), SPP and TBP (P < .001, r = 0.690), SPP and tcPO₂ (P < .001, r = 0.455).