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High Versus Low Flow Rates During Lumbar Epidural Block
  1. Shaul Cohen, MD,
  2. Willem M. Luykx, MD and
  3. Gertie F. Marx, MD
  1. From the Department of Anesthesiology, Albert Einstein College of Medicine, Bronx, New York

Abstract

In vitro and in vivo studies have shown that rapid injection of solution through a large bore needle is associated with a higher flow rate than rapid injection through a small bore needle or catheter. In the epidural space, higher flow rates appear to lead to a wider spread of the injectate with exposure of the drug to more absorptive vessels. Flow rates can be reduced by either injecting through a small bore needle or catheter or, when injecting through a large bore needle, by limiting the speed of injection.

  • Epidural analgesia
  • Flow rate
  • Injection pressure

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Footnotes

  • Address reprint requests to Dr. Marx: Department of Anesthesiology, Albert Einstein College of Medicine, 1300 Morris Park Avenue‐J‐1226, Bronx, NY 10461.

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