A nurse in the acute mental health unit is admitting a new client with an eating disorder. The nurse is aware that which of the following are considered comorbidities of eating disorders? (Select all that apply.)

The correct answer is choice D.

Choice A rationale:

Encouraging the family to take the client out of the facility for short periods of time may not be appropriate at this point. Abrupt changes in behavior, like sudden cheerfulness, might be a warning sign for potential suicide risk in individuals with depression. Allowing the client to leave the facility could increase the risk of harm.

Choice B rationale:

Rewarding the client for the change in behavior might inadvertently reinforce the idea that acting cheerful is desirable. This could hinder the client's progress and therapeutic understanding of their condition.

Choice C rationale:

Asking the client why her behavior has changed is a thoughtful and reasonable approach, but it might not address the potential underlying issues adequately. Depression can still be present, and sudden shifts in mood should be monitored closely.

Choice D rationale:

Monitoring the client's whereabouts at all times is the appropriate action. Sudden improvements in a depressed client's demeanor could indicate that they have made a decision to end their life. Monitoring ensures their safety and enables prompt intervention if needed.

The correct answer is Choice D

Choice A rationale: Metrorrhagia, or irregular uterine bleeding, is not typically associated with anorexia nervosa. Instead, amenorrhea is more common due to hypothalamic suppression from low body fat and caloric intake. The hypothalamus reduces gonadotropin-releasing hormone (GnRH), leading to decreased luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which suppresses ovulation and menstruation. Estrogen levels fall below normal (typically 30–400 pg/mL), disrupting endometrial stability. Thus, bleeding is less likely than complete menstrual cessation.

Choice B rationale: Tachycardia is not expected in anorexia nervosa; bradycardia is more common due to metabolic adaptation and reduced cardiac workload. The body conserves energy by lowering heart rate, often below 60 bpm. Malnutrition leads to decreased thyroid hormone (T3), reduced sympathetic tone, and myocardial atrophy. Electrolyte imbalances and hypovolemia further depress cardiac output. Tachycardia may occur in refeeding syndrome or acute stress, but chronically, the heart rate is typically slow due to adaptive mechanisms.

Choice C rationale: Hyperkalemia is rare in anorexia nervosa; hypokalemia is far more common due to purging behaviors, vomiting, and diuretic or laxative abuse. Potassium levels often fall below the normal range of 3.5–5.0 mEq/L. Losses through the gastrointestinal tract and renal excretion lead to muscle weakness, arrhythmias, and fatigue. Intracellular shifts during starvation also contribute to low serum potassium. Hyperkalemia may occur transiently during tissue breakdown or renal failure but is not a hallmark finding.

Choice D rationale: Constipation is a frequent finding in anorexia nervosa due to decreased caloric intake, slowed gastrointestinal motility, and reduced fiber consumption. Starvation suppresses parasympathetic activity, leading to delayed colonic transit. Electrolyte imbalances, especially hypokalemia, further impair smooth muscle contraction. Normal bowel frequency ranges from three times per week to three times per day; anorexic clients often fall below this due to systemic hypometabolism. Constipation may also be exacerbated by dehydration and laxative dependence.