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Difficulty: MediumMedical History Evaluation

A 64-year-old man presents to the primary care clinic with a 3-week history of progressively worsening shortness of breath and chest tightness. He has a history of mild asthma that has been well-controlled without the need for daily controller medications for several years. His medical history is also significant for hypertension, benign prostatic hyperplasia, and primary open-angle glaucoma, which was diagnosed by an ophthalmologist one month ago. His current oral medications include lisinopril and tamsulosin. He reports no fever, chills, productive cough, or recent upper respiratory tract infections. His blood pressure is 128/82128/82 mmHg, pulse is 6262/min, and respirations are 1818/min. Pulse oximetry shows 96%96\% on room air. Physical examination reveals a prolonged expiratory phase with bilateral end-expiratory wheezing.

Which of the following inquiries during the medical history evaluation is most likely to reveal the etiology of this patient's current symptoms?

  1. Which specific eye drops were you prescribed at your recent ophthalmology visit?Answer
  2. B
    Have you experienced a dry, persistent cough since starting lisinopril?
  3. C
    Have you recently started using over-the-counter nonsteroidal anti-inflammatory drugs?
  4. D
    Did your recent routine laboratory tests show an elevated eosinophil count?
  5. E
    Have you received your recommended annual influenza and pneumococcal vaccinations?

Answer

The most appropriate inquiry is to ask which specific eye drops were prescribed at the recent ophthalmology visit, as this investigates the potential initiation of a topical beta-blocker.
The correct answer focuses on identifying the specific eye drops prescribed at the patient's recent ophthalmology visit. This patient is experiencing an acute asthma exacerbation, characterized by shortness of breath, chest tightness, and wheezing. His symptoms began shortly after being diagnosed with primary open-angle glaucoma. First-line medical therapy for glaucoma often includes topical non-selective beta-blockers, such as timolol. Although these medications are administered ocularly, they drain through the nasolacrimal duct and are absorbed systemically via the highly vascular nasal mucosa, bypassing first-pass hepatic metabolism. In patients with reactive airway disease, systemic absorption of non-selective beta-blockers antagonizes beta-2 adrenergic receptors in the bronchial smooth muscle, leading to severe bronchospasm. The mildly low-normal heart rate (6262/min) also subtly points to systemic beta-blockade. Therefore, inquiring about the specific eye drops is the most critical diagnostic step to identify this iatrogenic trigger.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and physical examination findings.
The patient is experiencing an acute asthma exacerbation, evidenced by progressively worsening shortness of breath, chest tightness, and bilateral end-expiratory wheezing.
Establishing the primary clinical problem is the first step in formulating a differential diagnosis.
2
Identify the temporal relationship between the onset of symptoms and recent medical events.
The respiratory symptoms began 3 weeks ago, shortly after he was diagnosed with primary open-angle glaucoma (one month ago).
Temporal associations often point to iatrogenic causes or new environmental exposures.
3
Correlate the new diagnosis with potential treatments that could trigger the current symptoms.
Primary open-angle glaucoma is commonly treated with topical non-selective beta-blockers (e.g., timolol). Systemic absorption of these eye drops can cause severe bronchoconstriction in patients with a history of asthma.
Recognizing pharmacological side effects and contraindications is crucial for identifying the etiology of an iatrogenic complication.

Key Concept

Identifying iatrogenic triggers of asthma exacerbations, specifically the systemic side effects of topical ophthalmic beta-blockers, through targeted medical history evaluation.
Estimated Time:1m 0s
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Topics

Medical History Evaluation

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