What is the first-line oral medical treatment for a patient diagnosed with uncomplicated primary Raynaud's phenomenon refractory to non-pharmacologic cold-avoidance measures?

Answer and explanation

Correct answer: D. Dihydropyridine calcium channel blockers (e.g., Nifedipine or Amlodipine)

  1. Step 1: Raynaud's phenomenon is characterized by episodic digital vasospasm induced by cold exposure or emotional stress, presenting with pallor, cyanosis, and reactive rubor.
  2. Step 2: When lifestyle modifications (warm gloves, avoiding sudden temperature changes, smoking cessation) fail, oral dihydropyridine calcium channel blockers (specifically oral Nifedipine or Amlodipine) are the first-line pharmacotherapy of choice due to potent peripheral arterial vasodilation.
  3. Step 3: Identify dihydropyridine calcium channel blockers.
Answer
Dihydropyridine calcium channel blockers (e.g., Nifedipine or Amlodipine).
Why not the others: 'Beta-blockers' are contraindicated as they exacerbate peripheral vasoconstriction via unopposed alpha-adrenergic tone; 'NSAIDs' provide analgesic action without relieving microvascular spasm; 'Systemic corticosteroids' have no role in uncomplicated primary Raynaud's.

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