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Zorluk: OrtaSomatic Symptom and Eating Disorders

A 26-year-old woman presents to the clinic seeking assistance with smoking cessation. She has smoked one pack of cigarettes per day for the past 6 years. The patient also reports feeling "down" and fatigued for the past 6 months. Her BMI is 21 kg/m^2. Vital signs are within normal limits. Physical examination is notable for mild bilateral parotid gland enlargement and calluses on the dorsum of her right hand. Upon further questioning, the patient admits to episodes of eating abnormally large quantities of food followed by self-induced vomiting 3 to 4 times per week over the past year. Laboratory studies show a serum potassium of 3.2 mEq/L and a serum chloride of 94 mEq/L. The physician discusses pharmacological options for smoking cessation and considers prescribing bupropion. Which of the following best explains why bupropion is contraindicated in this patient?

  1. It significantly lowers the seizure threshold in the setting of frequent purging.Cevap
  2. B
    It poses a high risk of precipitating a manic episode when used without a mood stabilizer.
  3. C
    It can cause serotonin syndrome due to dangerous interactions with other psychiatric medications.
  4. D
    It impairs the expected respiratory compensation for her current acid-base disturbance.
  5. E
    It suppresses thyroid-stimulating hormone secretion, which can unmask underlying secondary hypothyroidism.

Cevap

Bupropion is contraindicated because it significantly lowers the seizure threshold, placing patients with eating disorders (who often have electrolyte imbalances from purging) at high risk for seizures.
The correct option correctly identifies that bupropion lowers the seizure threshold. In a patient with bulimia nervosa, frequent purging leads to electrolyte abnormalities, such as hypokalemia (which this patient has), which independently lower the seizure threshold. Administering bupropion to such a patient significantly increases the risk of generalized tonic-clonic seizures, making it an absolute contraindication.

Adım Adım Çözüm

1
Diagnose the underlying psychiatric condition based on the clinical presentation.
The patient has a normal BMI, parotid gland enlargement, calluses on the dorsum of the hand (Russell sign), hypokalemia, and a history of binge eating with self-induced vomiting. This confirms a diagnosis of Bulimia Nervosa.
Accurate identification of the underlying disorder is a prerequisite for safe pharmacological management.
2
Evaluate the pharmacological properties and contraindications of the considered medication (bupropion).
Bupropion is a norepinephrine-dopamine reuptake inhibitor (NDRI) effective for smoking cessation and depression. However, its major adverse effect is a dose-dependent lowering of the seizure threshold.
Recognizing a drug's absolute contraindications prevents iatrogenic harm.
3
Correlate the patient's diagnosis with the medication's adverse effect profile.
Patients with bulimia nervosa frequently develop electrolyte abnormalities (like the hypokalemia seen here) that independently lower the seizure threshold. Adding bupropion creates a synergistic and unacceptable risk for generalized tonic-clonic seizures.
This physiological overlap makes bupropion absolutely contraindicated in all patients with a current or prior diagnosis of bulimia nervosa or anorexia nervosa.

Anahtar Kavram

Bupropion is absolutely contraindicated in patients with bulimia nervosa and anorexia nervosa because it lowers the seizure threshold, which is particularly dangerous in patients who may already have a lowered threshold due to purging-induced electrolyte abnormalities.

Alternatif Yöntem

When evaluating any psychiatric medication request in a patient with a normal or low BMI presenting with parotid swelling or dental erosions, always immediately rule out medications that lower the seizure threshold (bupropion) or prolong the QTc interval, as purging-induced hypokalemia exacerbates both risks.
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