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Revista Brasileira de Anestesiologia

Print version ISSN 0034-7094On-line version ISSN 1806-907X

Rev. Bras. Anestesiol. vol.65 no.3 Campinas May/June 2015

http://dx.doi.org/10.1016/j.bjane.2014.06.010 

Scientific Articles

Evaluation of brachial plexus fascicles involvement on infraclavicular block: unfixed cadaver study

Luiz Carlos Buarque de Gusmão a   b  

Jacqueline Silva Brito Lima a  

Jeane da Rosa Oiticica Ramalho a  

Amanda Lira dos Santos Leite a   * 

Alberson Maylson Ramos da Silva a  

aUniversidade Federal de Alagoas (UFAL), Maceió, AL, Brazil

bColégio Brasileiro de Cirurgiões, Maceió, AL, Brazil

ABSTRACT

BACKGROUND AND OBJECTIVES:

This study shows how the diffusion of the anesthetic into the sheath occurs through the axillary infraclavicular space and hence proves the efficacy of the anesthetic block of the brachial plexus, and may thereby allow a consolidation of this pathway, with fewer complications, previously attached to the anesthesia.

MATERIALS AND METHODS:

33 armpits of adult cadavers were analyzed and unfixed. We injected a solution of neoprene with latex dye in the infraclavicular space, based on the technique advocated by Gusmão et al., and put the corpses in refrigerators for three weeks. Subsequently, the specimens were thawed and dissected, exposing the axillary sheath along its entire length.

RESULTS AND DISCUSSION:

Was demonstrated involvement of all fasciculus of the plexus in 51.46%. In partial involvement was 30.30%, 18.24% of cases the acrylic was located outside the auxiliary sheath involving no issue.

CONCLUSIONS:

The results allow us to establish the infraclavicular as an effective and easy way to access plexus brachial, because the solution involved the fascicles in 81.76% partially or totally, when it was injected inside the axillary sheath. We believe that only the use of this pathway access in practice it may demonstrate the efficiency.

Key words: Regional anesthesia; Brachial plexus; Block infraclavicular

Introduction

Over the years, brachial plexus blockade by supraclavicular and axillary routes has presented a number of complications and failures, bringing back the use of the infraclavicular route.1

The infraclavicular brachial plexus block was initially advocated by Hirschel2 in 1913. In 1917, Bazy3 introduced a needle below the clavicle, in a "anesthetic line" drawn between the anterior tubercle of the sixth cervical vertebra and the coracoid process. In 1918, Babitsky4 injected the anesthetic between the angle formed by the 2nd rib and the clavicle.

In 1922, Labat5, after injecting the anesthetic at the same point recommended by Bazy, flexed the arm toward the chest and performed another injection of the same solution.

In 1924, Balog6 modified Bazy's technique, but the needle was introduced toward the rib cage, until it touches the second rib, and he retreated the needle a little and deposited the anesthetic.

In 1973, Raj et al.7 introduced the needle at a midpoint of the clavicle, turning it to the side to prevent puncturing the chest wall.

Sims8, 1977, modified the technique by Raj et al. using a standard 3.8 cm needle which directed downward, outward, and backward reached the brachial plexus 2-3 cm after having passed the skin. He emphasizes that it is a rapid, easy and consistent access route for blockade performance.

Whiffler9, 1981, drew a line between the subclavian and axillary arteries, and the puncture was made at the point that this line crossed the coracoid process and reported success in 92.5% of cases and arterial puncture in 50%.

In 1995, Kilka et al.10 reported that the infraclavicular brachial plexus block have lower risk of pneumothorax and low incidence of phrenic nerve block.

In 2001, Imbelloni et al.1 determine that the injection should be at a point 1.5 cm below the site of union between the lateral third and the medial two-thirds of the clavicle, succeeding in 94% of cases.

Although there were fewer complications, cases of vascular and chest wall punctures with consequent pneumothorax were still reported.11

In 2002, Gusmão et al.11 used one hundred fixed cadavers and performed infraclavicular fossa dissection, which was present in 96% of cases, determining that brachial plexus block by this route should be performed after finding the angle formed by the junction of the anterior margin of the deltoid muscle and the clavicle, draw a bisector from the angle to the fossa center, measuring about 2.21 cm, and enter the needle perpendicular to the skin at this site with a depth of 3.0-3.5 cm, piercing the axillary sheath and reaching the brachial plexus, which are located at this level, laterally to the axillary vessels.

Verifying that brachial plexus in most cases lies within the infraclavicular fossa and that the blockade by this access route reaches the brachial plexus fasciculi with few failures and without the complications described in the interscalene, supraclavicular, and axillary techniques, it remained to be demonstrate how the anesthetic spread behaves by using the above described route.

Materials and methods

Complying with what determines the Federal Law N° 8501, November 30, 1992 (Annex), and after institutional approval, 33 axillary regions of unfixed adult cadavers of both sexes donated by the Instituto Médico Legal Estácio de Lima to the Medical Scholl of the Universidade Federal de Alagoas were used in this study.

The infraclavicular route was used, through the infraclavicular fossa, as stated by Gusmão et al.11 Instead of the anesthetic, we used a dilute solution of neoprene latex with dye (30 Ml). After injection, the bodies were placed into the refrigerator, where they remained for about three weeks. After the neoprene latex solidification period, the bodies were thawed. Subsequently, a large incision from the neck to the armpit was performed, exposing the full extent of the axillary sheath, as well as its content. Such access has allowed us to observe and analyze the injected solution diffusion along the axillary sheath, as well as the brachial plexus fasciculi involved.

Results

The findings in the 33 injected axillae were as follows:

-In 51.46% of cases (17 axillae) there was 100% involvement of brachial plexus fasciculi (Figure 1 and Figure 2).

Figure 1 - Total involvement of the brachial plexus (yellow). V, axillary vein; fl, lateral fasciculus; fm, medial fasciculus. 

Figure 2 - Total involvement of brachial plexus fasciculi (blue). V, axillary vein; a, axillary artery; fl, lateral fasciculus; fp, posterior fasciculus. 

-In 30.30% of cases (10 axillae), the anesthetic partially involved the brachial plexus fasciculi as follows: in three axillae there was diffusion only of the posterior and medial fasciculi; in three axillae, the solution only circled the lateral fasciculus; in two axillae, only the lateral and posterior fasciculi were involved; in two axillae, only the posterior fasciculus was bathed in solution.

In 18.24% of cases (six axillae), almost all of the solidified solution was located outside the axillary sheath, and when the acrylic was into the sheath, no fasciculus was involved.

Discussion

Since the 70s, studies have demonstrated the superiority of the infraclavicular brachial plexus block. Raj7 has successful in blocking all brachial plexus in most cases (95%), arguing that this approach is quite safe for brachial plexus block, allowing the adequate anesthetic block of the upper limb.

The infraclavicular anesthetic blockade techniques reported in the literature use several points below the clavicle, which sometimes are over the pectoralis major muscle, sometimes beside the coracoid process, or over the infraclavicular fossa.11 In several recommended access routes the anesthetic injection site was not always within the infraclavicular fossa and there is no information about the fossa site through which the brachial plexus and axillary vessels pass. The access route proposed by Gusmão et al.11 shows that, in most cases, the brachial plexus fasciculi are located in this fossa and, for security in the implementation of the blockade by the anesthesiologist, it was given the information not only of the depth where the plexus is located, but also its location within the infraclavicular fossa, from the angle formed by the deltoid muscle and the clavicle.

In our study, although we have injected the solution in cadavers, whose diffusion is inferior to that of a patient due to rigor mortis, there was total or partial involvement of brachial plexus fasciculi in 81.76% of cases.

The partial involvement of fasciculi, and cases in which the solution was located outside the sheath, was in part due to the fact that puncture was not performed by a single investigator, and failure may have occurred in the depth of needle insertion.

We argue that the solution located outside the axillary sheath may have resulted from leakage because, although some authors believe that this sheath forms a enclosed space,12 dissections in laboratory showed that the solution injected into it could be leaked through the holes drilled by vascular and nervous structures transfixing the sheath.

Based on the results and using the access route proposed by Gusmão et al.,11 we observed that it allows easy access to brachial plexus, as the injected solution involved the fasciculi in 81.76% of cases, with 51.46% totally envolved and 30.30% partially envolved when it was injected into the axillary sheath.

We believe that the use of this route, performed by anesthesiologists, yields the same results reported by Imbelloni et al.1

References

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Received: March 24, 2014; Accepted: June 02, 2014

* Corresponding author. E-mail: amandaleite23@gmail.com (A.L.d.S. Leite).

Conflicts of interest The authors declare no conflicts of interest.

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