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Fig. 3 | Trials

Fig. 3

From: Effects of double vs triple injection on block dynamics for ultrasound-guided intertruncal approach to the supraclavicular brachial plexus block in patients undergoing upper limb arteriovenous access surgery: study protocol for a double-blinded, randomized controlled trial

Fig. 3

Images demonstrating the satisfactory imaging for IA-SCB (A, B) and the double-injection (C) and triple-injection (D) techniques used in IA-SCB. A, B The satisfactory imaging of the individual trunks of the brachial plexus in the supraclavicular fossa. C Sites of injection in the DI method: the needle tip (dotted arrows) is orientated to the intertruncal planes of the 3 trunks (first injection in the lower intertruncal plane, second in the upper plane), and the desired spread pattern of LA will be confirmed by ultrasound. D Sites of injection in the TI method: the needle tip (dotted arrows) is orientated orderly to the outer boundaries (epineurium) of the trunks, and the desired spread pattern of LA will be confirmed by ultrasound. The injection sequence is from bottom to top, that is the first injection for the lower trunk, second for the middle trunk, and last for the upper trunk. A, anterior division of upper trunk; p, posterior division of upper trunk; SSn, suprascapular nerve; L, lower trunk; M, middle trunk; Pl, pleura; R1, first rib; SA, subclavian artery; dotted line = intertruncal planes; ASM, anterior scalene muscle; LA, local anesthetics; IA, intertruncal approach; SCB, supraclavicular block; DI, double injection; TI, triple injection

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Trials

ISSN: 1745-6215