Impact of Peripheral Nerve Block Technique on Incidence of Phrenic Nerve Palsy in Shoulder Surgery

Figure 1

Schematic depicting the anatomical relationship of the left PN and BP, as well as the typical sites of injection for the ISB and phrenic-sparing blocks. PN, phrenic nerve; ISB, interscalene block site (blue rectangle); AS, anterior scalene; MS, middle scalene; SSN, suprascapular nerve; SA, subclavian artery; ST, superior trunk; STB, superior trunk block injection site (green rectangle); SUTB, subparaneural superior trunk block site (white rectangle); aSSNB, anterior suprascapular nerve block site (orange rectangle). Adapted from Zhang et al. [19].