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Difficulty: MediumSomatic Symptom and Eating Disorders

A 45-year-old woman comes to a new primary care clinic to establish care. For the past 12 months, she has experienced chronic, migratory abdominal pain, generalized muscle aches, and perceived shortness of breath. She has been evaluated by a gastroenterologist, a rheumatologist, and a pulmonologist. Extensive diagnostic workups, including endoscopy, autoimmune panels, and pulmonary function tests, have all been completely normal. She states, "I know I have a terrible systemic disease that everyone is missing, and I cannot stop thinking about it." She reports spending at least 3 hours daily researching her symptoms on medical forums, which has led to a recent leave of absence from her job. During today's visit, she becomes acutely anxious and begins to hyperventilate, stating that her "lung disease is flaring up." Her lungs are clear to auscultation bilaterally, and there is no wheezing. An arterial blood gas on room air reveals:

pH: 7.557.55
pCO 2_2: 24 mm Hg24 \text{ mm Hg}
pO 2_2: 105 mm Hg105 \text{ mm Hg}
HCO 3−_3^-: 21 mEq/L21 \text{ mEq/L}

She urgently requests a referral to a quaternary care pulmonology center.

Based on the clinical presentation and laboratory findings, which of the following is the most accurate interpretation of this patient's acid-base status and the most appropriate next step in management?

  1. Acute primary respiratory alkalosis; establish regular, time-limited visits with this primary care providerAnswer
  2. B
    Compensated normal anion gap metabolic acidosis; establish regular, time-limited visits with this primary care provider
  3. C
    Acute primary respiratory alkalosis; prescribe a combination of citalopram and phenelzine to manage her severe distress
  4. D
    Acute primary respiratory alkalosis; diagnose brief psychotic disorder due to her somatic delusions and start antipsychotic therapy
  5. E
    Uncompensated primary metabolic alkalosis; administer an inhaled short-acting beta-agonist for an acute chronic obstructive pulmonary disease exacerbation

Answer

The acid-base status is an acute primary respiratory alkalosis, and the best management is to establish regular, time-limited visits with this primary care provider.
The correct answer accurately identifies two key elements of this clinical vignette: the acid-base interpretation and the psychiatric management. The patient's arterial blood gas shows a pH of 7.55 (alkalemia) and a pCO2 of 24 mm Hg, which characterizes an acute primary respiratory alkalosis due to her acute hyperventilation. Psychiatrically, she exhibits classic signs of Somatic Symptom Disorder: at least one distressing somatic symptom, disproportionate and persistent thoughts about the seriousness of the symptoms, and high levels of anxiety lasting more than 6 months despite extensive negative medical evaluations. The most effective initial management strategy for Somatic Symptom Disorder is to establish a strong therapeutic alliance via regular, scheduled, time-limited appointments with a single primary care provider. This approach provides ongoing reassurance, prevents "doctor shopping," and mitigates the risk of iatrogenic harm from unnecessary diagnostic tests and specialist referrals.

Step-by-Step Solution

1
Analyze the patient's psychiatric clinical presentation and timeline.
The patient has multiple distressing somatic symptoms for >6 months with excessive worry, research, and functional impairment despite normal medical workups. This meets the criteria for Somatic Symptom Disorder.
Accurate diagnosis of the underlying psychiatric condition is required to determine the long-term management strategy.
2
Interpret the arterial blood gas results to identify the primary acid-base disturbance.
The pH is 7.55 (alkalemia). The pCO2 is low (24 mm Hg), which aligns with the high pH, indicating a primary respiratory alkalosis caused by acute hyperventilation.
The patient is acutely hyperventilating due to anxiety. Checking the expected compensatory decrease in HCO3- (2 mEq/L drop for every 10 mm Hg drop in pCO2) confirms this is an acute phase.
3
Select the most appropriate evidence-based next step in management for Somatic Symptom Disorder.
The standard of care is scheduling regular, time-limited appointments with a single primary care physician.
This strategy prevents excessive specialist referrals, limits unnecessary diagnostic testing, and provides the patient with a reliable source of reassurance and care.

Key Concept

Patients with Somatic Symptom Disorder (SSD) present with significant distress regarding physical symptoms despite negative medical workups. The cornerstone of management is establishing a strong physician-patient relationship through regular, scheduled, time-limited visits with a single primary care provider to minimize unnecessary diagnostic testing.
Estimated Time:1m 30s
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Topics

Somatic Symptom and Eating Disorders

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