Endovascular aortic repair reduces gluteal oxygenation

Provoked gluteal claudication is a known risk after endovascular aortic repair (EVAR). Lowered gluteal muscle oxygenation (S_gmO₂) may be demonstrated by near-infrared spectroscopy (NIRS).

To evaluate NIRS-determined S_gmO₂ in EVAR patients.

NIRS-determined S_gmO₂ was used in an observational study design (n = 17). From the ambulatory setting, seven EVAR patients were included with reported gluteal claudication from medical records. In 10 patients scheduled for EVAR, S_gmO₂ was measured before and after the procedure. NIRS sensors were applied bilaterally on the gluteal region. Treadmill walking (12% incline, 2.4 km/h) was introduced to stress gluteal muscles.

A reduced S_gmO₂ with regional side difference (P < 0.05) was noted in all 10 patients following EVAR and four reported gluteal claudication. In patients with gluteal claudication (n = 7), treadmill decreased S_gmO₂. The time to recover the S_gmO₂ was prolonged for tissue exposed to occluded hypogastric artery (median = 512 s, range = 73-1207 s vs. median = 137, range = 0-643 s; P = 0.046).

EVAR affects gluteal muscle oxygenation. NIRS could be used to assess whether gluteal claudication is related to lowered S_gmO₂.