TITLE:
Features and Principles the Spread of Local Anesthetic Blockade of the Sciatic Nerve at Depends on the Amount of Anesthetic
AUTHORS:
Piacherski Valery, Marachkou Aliaksei
KEYWORDS:
Sciatic Nerve Block; Ultrasound-Guided; Local Anesthetic Spreading
JOURNAL NAME:
Open Journal of Anesthesiology,
Vol.4 No.2,
January
29,
2014
ABSTRACT: Aim: To study the features of local anesthetic solution
spreading during sciatic nerve block in dependence on the anesthetic solution volume. Material and Methods: One hundred and sixty nine cases of
sciatic nerve blocks done under ultrasonic visualization control were analyzed.
Sciatic nerve blocks were performed by lidocaine in volumes 30; 25; 20; 15;
12.5; 10; 7.5; 6.5; 5; 4.5 ml. The cross-section area, equal to local
anesthetic spreading, was determined; the extension of the anesthetic solution
spreading along sciatic nerve was calculated. Results: The anesthetic agent solution spreads along sciatic nerve in proximal and
distal direction, forming a kind
of cylinder. The minimum volume of the local anesthetic, which covers sciatic
nerve in the whole, is 5 ml. A rare (1.77%) variation of sciatic nerve
structure was described, in which tibial and common peroneal nerves develop
directly from the branches of sacral plexus. Conclusion: The decrease of
the local anesthetic volume leads to reduction of its spreading distance and
cross-section area. Ultrasonic visualization can provide
for sciatic nerve anatomical peculiarities, which can have an effect on the
block quality.