NCT 01010412.

Trial name or title	Ultrasound visualization versus electrical nerve stimulation
Methods	Randomized design
Participants	Patients aged over 18 years undergoing unilateral elective surgical procedure requiring interscalene block
Interventions	US versus NS
Outcomes	Incidence of successful block Amount of sedation required for block
Starting date	February 2009
Contact information	Principal Investigator: Nanette Schwann, M.D., Allentown Anesthesia Associates, Pensylvannia, US
Notes	Clinical trials identifier: NCT 01010412