Continuous Surveillance of Lower Limb Perfusion During Aortic Surgery With Near-Infrared Spectroscopy: A Pilot Study

Abstract

Background: Near-infrared spectroscopy (NIRS) is a noninvasive technique that allows continuous monitoring of the regional hemoglobin oxygen saturation (rSO₂) index. We evaluated its application to survey perioperative lower limb perfusion. Methods: A total of 10 patients (7 men, aged 71) were monitored during abdominal surgery for aortic aneurysms. The rSO₂ index was measured at the M gastrocnemius (optode 1) and at the dorsum of the foot (optode 2). Results: Mean baseline rSO₂ values for optodes 1 and 2 were 67 and 66, respectively. After clamping the aorta or iliacofemoral arteries, rSO₂ dropped to 32 for optode 1 (P < .0001) and to 27 for optode 2 (P < .0001). After declamping, rSO₂ increased to 74 for optode 1 (P = .0012 vs baseline) and also to 74 for optode 2 (P = .0018 vs baseline). Conclusion: Near-infrared spectroscopy is an easily applicable, noninvasive tool for continuous surveillance of lower extremity perfusion during aortic reconstruction.

Keywords

NIRS AAA ischemia reperfusion

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