Document Detail

Cephalad angulation of epidural needle insertion may be an important factor for safe epidural space approach: a mathematical model.
MedLine Citation:
PMID:  22063377     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND OBJECTIVES: Epidural approach angle is one of the determining factors for needle traveling length to reach the epidural space. Likewise, the margin of safety against accidental dural puncture should be affected by epidural approach angle because the space available for epidural needle tip movement in the epidural space is depending on the inserting angle to the epidural space. The purpose of this study is to conjecture the effect of the angle formed with the skin and an epidural needle on the margin of safety against accidental dural puncture using a mathematical model.
CASE REPORT: Suppose that the width of the epidural space is A mm and that the force advancing the epidural catheter is Ckgf and the diameter of the catheter is D mm. In this situation, assuming that the cephalad angle with the midline approach formed with the skin and an epidural needle is θ, the following parameters can be determined: the available distance for the needle tip in the epidural space = A/sinθmm; cephalad advancing force of catheter = C*cosθkgf; and the pressure at the site of dura matter where the epidural catheter is pushing = 400*C*sinθ.πD(-2) The longer the distance available for the needle tip, the larger the margin of safety for dura injury by the epidural needle. It is supposed that θ should be set smaller to make the margin of safety larger. Likewise, smaller θ could decrease the pushing pressure and more effectively create a distinct cephalad advancing force.
CONCLUSIONS: Acute cephalad angulation should be considered to increase the margin of safety for epidural approach and catheterization.
Satoki Inoue; Masahiko Kawaguchi; Hitoshi Furuya
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Revista brasileira de anestesiologia     Volume:  61     ISSN:  1806-907X     ISO Abbreviation:  Rev Bras Anestesiol     Publication Date:    2011 Nov-Dec
Date Detail:
Created Date:  2011-11-08     Completed Date:  2012-03-27     Revised Date:  2014-04-07    
Medline Journal Info:
Nlm Unique ID:  0401316     Medline TA:  Rev Bras Anestesiol     Country:  Brazil    
Other Details:
Languages:  eng; mul     Pagination:  764-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Editora Ltda. All rights reserved.
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MeSH Terms
Anesthesia, Epidural / instrumentation*,  methods*
Epidural Space
Mathematical Concepts
Models, Theoretical
Comment In:
Braz J Anesthesiol. 2013 Jul-Aug;63(4):375   [PMID:  24565249 ]
Rev Bras Anestesiol. 2012 Nov-Dec;62(6):885-6   [PMID:  23176997 ]

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