Not all reasons for difficult peripheral nerve blocks are at the proximal end of the needle.
Hübler
Matthias
M
Stehr
Sebastian N
SN
D004868:Equipment Failure; D005260:Female; D006801:Humans; D008160:Lumbosacral Plexus; D009339:Needles; D009407:Nerve Block / Q000295:instrumentation; D009767:Obesity, Morbid; D012584:Sciatic Nerve