Crow S J, Salisbury J J, Crosby R D, Mitchell J E
Department of Psychiatry, University of Minnesota, Minneapolis, USA.
Int J Eat Disord. 1997 Jan;21(1):95-8. doi: 10.1002/(sici)1098-108x(199701)21:1<95::aid-eat12>3.0.co;2-n.
Patients with bulimia nervosa often have serum electrolyte abnormalities that result from vomiting and/or laxative or diuretic use. Thus, serum electrolytes could serve as an objective marker of such behaviors.
This study is a retrospective examination of serum electrolyte levels and vomiting behavior in 138 bulimic women, and of serum electrolyte levels in 70 control women.
Logistic regression analyses demonstrated that only potassium values distinguished bulimic subjects from controls. Potassium levels below the lower limit of normal (3.7 mg/l) occurred only in the bulimic group.
Abnormally low values for potassium are a specific, but not sensitive, predictor of recent vomiting episodes.
神经性贪食症患者常因呕吐和/或使用泻药或利尿剂而出现血清电解质异常。因此，血清电解质可作为此类行为的客观指标。
本研究对138名贪食症女性的血清电解质水平和呕吐行为以及70名对照女性的血清电解质水平进行了回顾性检查。
逻辑回归分析表明，只有钾值能区分贪食症患者和对照组。血钾水平低于正常下限（3.7毫克/升）仅出现在贪食症组。
血钾异常低值是近期呕吐发作的一个特异性但不敏感的预测指标。
