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Horner Syndrome Interscalene Block — FRCA Final MCQ

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EasyRegional AnaesthesiaHorner Syndrome Interscalene BlockFRCA Final

30 minutes after interscalene block with 20 mL 0.375% ropivacaine, the patient develops ipsilateral ptosis, miosis, anhidrosis, enophthalmos. What has occurred?

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Correct answer: A — Stellate ganglion block (Horner syndrome)

Horner syndrome occurs in up to 75-100% of interscalene blocks from blockade of cervical sympathetic chain (stellate ganglion) by LA spreading medially. Self-limiting, resolves with block. Warn preoperatively. Not harmful but document.

Reference: BJA Education – 2022 – Complications of interscalene block