Sciatic Block Increases Regional Saturation in Peripheral Artery Occlusive Disease.

Sciatic Block Increases Regional Saturation in Peripheral Artery Occlusive Disease Monitored by NIRS: a Prospective Monocentric Study.

We conducted Single-center prospective observational study to evaluate the improvement of peripheral vascular perfusion monitored with near-infrared spectroscopy, in patients undergoing endovascular surgery after performing sciatic nervous block.

The aims of that study is to check regional oxigen saturation variability in patients suffering from Peripheral Artery Occlusive Disease (IIa to III Fontaine classification) undergoing popliteal sciatic nerve block as analgesic procedure before vascular surgery. We want to evaluate the increase in regional microcirculation after the popliteal nerve blocks due to vasoplegic response and vasodilatation after performing regional anaesthesia. We will place NIRS electrode on the instep of the foot to evaluate regional oxigen saturation in the interested leg before the performing of popliteal sciatic nerve block and then during the surgery (after 5 minuts, 15 minuts, 30 minuts), and after the end of the procedure.

Inclusion Criteria:

• age: > 18 years
• Peripheral artery occlusive desease involving popliteal, tibial and/or peroneal artery
• Stadiation IIa to III in Fontaine classification
• Eligibility for PTA or Stenting

Exclusion Criteria:

• trophic alteration of the application site of the NIRS
• less than 18 years
• Pregnancy
• need of sedation during the procedure
• revascularization performed as emergency surgery
• Allergic reactions with local anaesthetic
• Previous surgery involving the interested artery