Hi - welcome to allnurses!
I've found a couple of articles for you:
"Patient tolerance to intravenous potassium chloride with and without lidocaine" - F Pucino, BD Danielson, JD Carlson, GL Strommen, PR Walker, CL Beck, DJ Thiege, and DS Gill
(Drug Intelligence & Clinical Pharmacy: Vol. 22, No. 9, pp. 676-679)
http://www.theannals.com/cgi/content/abstract/22/9/676
Morrill GB, Katz MD "The use of lidocaine to reduce the pain induced by potassium chloride infusion" J Intraven Nurs. 1988 Mar-Apr;11(2):105-8
Rapp RP "Use of lidocaine to reduce pain associated with potassium chloride infusions" Clin Pharm. 1987 Feb;6(2):98
Lim ET, Khoo ST, Tweed WA "Efficacy of lignocaine in alleviating potassium chloride infusion pain" Anaesth Intensive Care. 1992 May;20(2):196-8
Chan, R and Armstrong D "Peripheral intravenous infusion of potassium chloride: effect of solution composition on infusion-site pain" Can J Hosp Pharm. 2004;57;27-31 (
http://www.scholar.google.com/schola...travenous+pain)
I found these by going to
www.scholar.google.com (a search engine that only searches through academic sites) and typing 'potassium' 'intravenous' 'pain.'
I also found an interesting article ("Safety issues with adding lidocaine to IV potassium infusions" -
http://www.ismp.org/MSAarticles/Safety.htm) from the Institute of Safe Medical Practices.
Hope this helps