Interscalene complication — FRCA Primary MCQ
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Correct answer: E — Phrenic nerve
The phrenic nerve runs on anterior scalene and may be blocked. Pleural dome near subclavian vein is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Median nerve is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. T6 dermatome is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. C5 to T1 roots is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA anatomy, the tested structure should explain the block, airway sign or regional complication in the stem.
Reference: Ellis, Feldman & Harrop Anatomy for Anaesthetists; Primary FRCA textbooks