Low Potassium - (Currently listed in Health/Nutrition/Nutrients/Vitamins_and_Minerals/Potassium - more appropriate here.) - http://www.emedicinehealth.com/low_potassium/article_em.htm
Hypokalemia - Brief Mayo Clinic article explains what it is, the causes, and possible effects on the body. - http://www.mayoclinic.com/health/low-potassium/AN01143
eMedicine: Hypokalemia - Eleanor Lederer, MD discusses why potassium is essential to life. Includes three mechanisms that cause a decrease in serum blood levels, risk factors, common symptoms, and medical care. - http://www.emedicine.com/med/topic1124.htm