Characteristic results in anorexia nervosa include:

Characteristic results in anorexia nervosa include:

a.Decreased serum cholesterol levels
b.Decreased serum salivary amylase concentrations
c.St-segment and t-wave changes on electrocardiography
d.Increased fasting serum glucose concentrations

ans:
ST-segment and T-wave changes on electrocardiography

a. No laboratory tests can provide a diagnosis of anorexia nervosa. The medical phenomena present in this disorder result from the starvation or purging behaviors. However, several relevant laboratory tests should be obtained in these patients. A complete blood count often reveals leukopenia with a relative lymphocytosis in emaciated anorexia nervosa patients. If binge
eating and purging are present, serum electrolytes will reveal hypokalemic alkalosis.

b. Fasting serum glucose concentrations are often low (not increased) during the emaciated phase, and serum salivary amylase concentrations are often elevated (not decreased) if the patient is vomiting. An electrocardiogram may show ST-segment and T-wave changes, which are usually secondary to electrolyte disturbances; emaciated patients will have hypotension and bradycardia.

c. Adolescents may have an elevated (not decreased) serum cholesterol level. All of these values revert to normal with nutritional rehabilitation and cessation of purging behaviors. Endocrine changes that occur, such as amenorrhea, mild hypothyroidism, and hypersecretion of corticotrophinreleasing hormone, are attributable to the underweight condition and revert to normal with weight gain.