Objectives: This study evaluated the tissue blood pressure of the direct revascularised (DR) and indirect revascularised (IR) areas after distal bypass surgery using repeated skin perfusion pressure (SPP) measurements.Twenty-two patients received regular haemodialysis and all limbs were classified as Rutherford 5.
Methods: SPP of the direct and indirect revascularization area was measured at 10 time points, including pre- and post-days 3–6, 7–9, 10–12, 13–14, 15–17, 18–20, 21–23, 24–26 and 27–29. Patients were divided into two groups according to the number of postoperative days to the SPP peak at the DR, as follows: group A (n = 14; SPP peak day within 9 days), group B (n = 15; peak day after 10 days).
Results: In total, 446 SPP measurements were collected from 58 measurement sites and the transition of the SPP at the DR was 35.4–62.5–59.5–70.2–58.2–62.2–63.1–63.6–63.8–73.4 mmHg and IR was 29.4–53.4-53.7–58.8–51.3–63.1–47.9–62.1–57.6-61.0 mmHg. No significant differences were observed between SPP at the DR and IR except post-days 18–20 (Figure 1). Fifteen wounds on the DR (62.5%) and five on the IR (100.0%) healed. The wound healing rate and time were 92.9% and 81 days in group A, 53.3% and 222 days in group B (Figure II).
Conclusions: Distal artery bypass improved SPP in the IR and DR of patients with chronic limb-threatening ischaemia. An early SPP peak could be an indicator of wound healing.