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Related Experiment Videos

Selective transsacral nerve root blocks.

A J Clark1, S A Awad

  • 1Department of Anaesthesia, Dalhousie University, Halifax, Nova Scotia, Canada.

Regional Anesthesia
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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One milliliter of injectate effectively achieves selective sacral nerve root blocks. While larger volumes increase spread, they may complicate results interpretation by affecting unintended nerve roots.

Area of Science:

  • Pain Management
  • Neurology
  • Anesthesiology

Background:

  • Selective sacral nerve root blocks are used for pain management.
  • The optimal volume of local anesthetic/radiopaque dye for these blocks is not well-established.
  • Understanding injectate spread is crucial for accurate block efficacy assessment.

Purpose of the Study:

  • To compare the effectiveness and spread of 1 ml versus 2 ml of injectate in selective sacral nerve root blocks.
  • To determine if a smaller volume can achieve successful nerve root blockade.
  • To evaluate the impact of injectate volume on spread and potential for off-target nerve involvement.

Main Methods:

  • A comparative study involving patients undergoing selective sacral nerve root blocks.
  • Administration of either 1 ml or 2 ml of a local anesthetic/radiopaque dye combination.

Related Experiment Videos

  • Assessment of block success via urodynamic testing or pain relief scoring.
  • Radiographic evaluation of injectate spread.

    • Main Results:

    • Selective sacral nerve root blocks were achieved in 7/9 patients with 1 ml and 8/9 patients with 2 ml of injectate.
    • The 2 ml group demonstrated significantly greater injectate spread compared to the 1 ml group.
    • Patients who initially had unsuccessful blocks with 1 ml were later successfully treated with 1 ml at a different nerve root.

    Conclusions:

    • One milliliter of injectate is sufficient to produce a selective sacral nerve root block.
    • Increasing injectate volume enhances spread but increases the risk of involving adjacent nerve roots.
    • Smaller volumes may offer greater selectivity and reduce ambiguity in interpreting block outcomes.