RT Journal Article SR Electronic T1 Electrocardiogram Artifact Caused by Peripheral Nerve Stimulation During Regional Anesthesia JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 476 OP 476 DO 10.1097/AAP.0b013e3181ef6f0a VO 35 IS 5 A1 Sam Soltanifar A1 Mark Crowley YR 2010 UL http://rapm.bmj.com/content/35/5/476.abstract AB