Angulação cefálica da inserção da agulha peridural pode ser um fator importante para a abordagem segura do espaço peridural: um modelo matemático

Abstract

Summary: Inoue S, Kawaguchi M, Furuya H -Cephalad Angulation of Epidural Needle Insertion May Be an Important Factor for Safe Epidural Space Approach: a Mathematical Model. 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.

Angulação cefálica da inserção da agulha peridural pode ser um fator importante para a abordagem segura do espaço peridural: um modelo matemático

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Regarding the mathematical study of Inoue et al 1 , it is appropriate to mention the study by Cheng (Apud Collins) 2 published more than half a century ago in which the width of the circular epidural space (EP) and thickness of the dura mater (DM) were measured. According to Cheng 2 , the axial width of EP at L2-L3 is 6 mm and if the puncture is 30 degrees to the skin, the puncture safety margin (Figure 1 A) 1 becomes 12 mm (sen 30° = 6 mm / A).

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