Modified technique for proximal subclavicular brachial plexus block: study on unfixed cadavers

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Abstract

BACKGROUND: The proximal subclavian brachial plexus block is performed deep and posterior to the midpoint of the clavicle. Only a few studies evaluated the spread of local anesthetic when using a proximal subclavian approach to the brachial plexus. We performed a cadaveric study to evaluate the spread of the injection after performing proximal subclavian brachial plexus block using ultrasound navigation.

AIM: To examine the spread of the stained solution in unfixed corpses, when it is administered using a modified technique of proximal subclavian access to the brachial plexus using ultrasound navigation.

MATERIALS AND METHODS: Six ultrasound-guided injections were performed on three unfixed cadavers using 20 ml of a colored solution. The brachial plexus and its branches were distinguished from the level of the midpoint of the clavicle to the upper third of the shoulder. The boundaries of ink distribution in relation to the bundles and terminal branches of the brachial plexus from the intersection of the upper edge of the clavicle to the upper parts of the axillary region were assessed.

RESULTS: In all cases of dye spread, the lateral, posterior, and medial bundles of the brachial plexus were stained. Terminal branch staining varied and was limited to the proximal portions of these nerves. The dye spread to the interstellar space in 2 (33%) out of 6 (100%) injections and to the level of the upper edge of the clavicle in 4 (67%) injections. The axillary and radial nerves were stained in all injections, and the ulnar nerve was stained in 4 (67%) of 6 (100%) injections. The musculocutaneous and median nerves were stained in only 2 (33%) of 6 (100%) injections. No phrenic nerve staining was observed in any case.

CONCLUSIONS: On the basis of experiment results on unfixed cadavers, injection using a modified ultrasound-guided proximal subclavian approach can fill the fascial sheath surrounding the brachial plexus with the injection material, thus causing the dye to spread around all bundles of the brachial plexus to supraclavicular space. Additional research is needed to assess whether high injection volumes or multiple injection sites can affect distribution.

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About the authors

Vasiliy G. Tsvetkov

Military Medical Academy named after S.M. Kirov

Author for correspondence.
Email: vasilii_cvetkov@mail.ru
ORCID iD: 0000-0003-4980-597X
SPIN-code: 5316-4617

senior resident

Russian Federation, 6, Academic Lebedev str., St. Petersburg, 194044

Roman E. Lakhin

Military Medical Academy named after S.M. Kirov

Email: doctor-lahin@yandex.ru
ORCID iD: 0000-0001-6819-9691
SPIN-code: 7261-9985

MD, Dr. Sci. (Med.), assistant professor

Russian Federation, St. Petersburg

Alexey V. Shchegolev

Military Medical Academy named after S.M. Kirov

Email: alekseischegolev@gmail.com
ORCID iD: 0000-0001-6431-439X
SPIN-code: 4107-6860

MD, Dr. Sci. (Med.), Prof.

Russian Federation, St. Petersburg

Vyacheslav V. Shustrov

Military Medical Academy named after S.M. Kirov

Email: shustrov@anesthvmeda.ru
ORCID iD: 0000-0001-5144-3360
SPIN-code: 5955-7492
Russian Federation, St. Petersburg

Kirill A. Tsygankov

Military Medical Academy named after S.M. Kirov

Email: doctorcygankov@mail.ru
ORCID iD: 0000-0002-2357-0685
SPIN-code: 7133-0503

MD, Cand. Sci. (Med.)

Russian Federation, St. Petersburg

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Supplementary files

Supplementary Files
Action
1. Fig. 1. Sonogram of the neurovascular bundle obtained using the modified proximal subclavian approach. A – ultrasound image. B – ultrasound picture and diagram of the neurovascular bundle in the subclavian region (v.a. – axillary vein, a.a. – axillary artery, p.br. – brachial plexus)

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2. Fig. 2. Blockade performed using a modified technique of proximal subclavian access to the brachial plexus using ultrasound navigation. A. Position of the transducer and needle during the blockade. B. Schematic of visualization of the needle tip and bundles of the brachial plexus surrounded by solution (p.br. – brachial plexus, needle – needle, n.t. – needle tip, p.s. – colored solution)

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3. Fig. 3. Skin incision from the clavicle along the anterior edge of the deltoid muscle to the border of the upper and middle third of the shoulder. The arrow shows the middle of the clavicle

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4. Fig. 4. Layered tissue dissection to expose the neurovascular bundle (m.pect.major – pectoralis major muscle, m.pect.minor – pectoralis minor muscle)

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5. Fig. 5. A case of the neurovascular bundle filled with a colored solution. The neurovascular bundle is framed

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6. Fig. 6. Opened case of the neurovascular bundle (a.a. – axillary artery, l.c. – lateral bundle, m.c. – medial bundle, n.r. – radial nerve, mcn – musculocutaneous nerve, n.m. – median nerve, n.u. – ulnar nerve, ncabm - medial cutaneous nerve of the forearm)

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Свидетельство о регистрации СМИ ФС 77 - 55827 от 30.10.2013 г. выдано Федеральной службой по надзору в сфере связи, информационных технологий и массовых коммуникаций (Роскомнадзор). 
Свидетельство о регистрации СМИ ЭЛ № ЭЛ № ФС 77 - 80651 от 15.03.2021 г. выдано Федеральной службой по надзору в сфере связи, информационных технологий и массовых коммуникаций (Роскомнадзор).


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