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The parasacral sciatic nerve block

G F Morris1, S A Lang, W N Dust

  • 1Department of Anesthesia, Royal University Hospital, Saskatoon, Saskatchewan, Canada.

Regional Anesthesia
|May 1, 1997
PubMed
Summary
This summary is machine-generated.

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The parasacral approach for sciatic nerve blocks is highly effective for lower limb surgery, achieving a 97% success rate. This technique provides anesthesia to the entire sacral plexus and often results in obturator nerve motor block.

Area of Science:

  • Anesthesiology
  • Surgical Innovation
  • Regional Anesthesia

Background:

  • Investigating the clinical utility of a novel parasacral approach for sciatic nerve conduction block.
  • Examining the onset, extent, and success rates of this block for below-knee surgical procedures.

Purpose of the Study:

  • To evaluate the effectiveness of the parasacral approach for sciatic nerve block in lower limb surgery.
  • To assess the block's ability to anesthetize the sacral plexus and associated nerves.

Main Methods:

  • Thirty patients (ASA I-III) undergoing lower limb surgery were included.
  • Sciatic nerve identified via nerve stimulator (< or =0.2 mA); 30 mL of 1.5% lidocaine with epinephrine administered.
  • Trans-sartorial saphenous nerve blocks performed for medial leg anesthesia.

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Main Results:

  • The parasacral sciatic nerve block achieved an overall success rate of 97% for surgical anesthesia.
  • Anesthesia of all sacral plexus components was achieved; 93% showed obturator nerve motor block.
  • Saphenous nerve blocks were 100% effective; no obturator sensory anesthesia was mapped.

Conclusions:

  • The parasacral approach to the sciatic nerve demonstrates high success rates for surgical anesthesia below the knee.
  • This technique effectively blocks the entire sacral plexus and frequently induces obturator nerve motor block.