Cleveland Clinic. Head upright tilt test. Cleveland Clinic website. Available at:
http://my.clevelandclinic.org/heart/services/tests/electrocard/hut.aspx. Updated September 2011. Accessed May 10, 2013.
DynaMed Editors. Syncope evaluation. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed. Updated March 5, 2012. Accessed May 10, 2013.
Tilt table testing. Merck Manual for Health Care Professionals website. Available at: http://www.merckmanuals.com/professional/cardiovascular%5Fdisorders/cardiovascular%5Ftests%5Fand%5Fprocedures/tilt%5Ftable%5Ftesting.html. Updated January 2013. Accessed May 10, 2013.
American Heart Association
National Institute of Neurological Disorders and Stroke
Heart and Stroke Foundation of Canada