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5-555] mmHg) versus extraneural needle tip location (90 [50-158] mmHg; P 0001); for high flow (9.6 mL/min; 470 [265; 900] mmHg) versus low flow (1.2 mL/min; 120 [71-250] mmHg) (P 0.001) and for cervical roots (900 mmHg, intraneurally) compared with nerves (300 mmHg, intraneurally). In 37 patients and 61 procedures, there were 7 [1-18] peaks of injection pressure per procedure. Pressure was noted 750 mmHg during 13.80% of the procedural time. Needle diameter, needle tip location, type of nerve/plexus, flow rates, and the a