skip to main content

Stellate ganglion block and Horner syndrome — FRCA Primary MCQ

Instant feedback + full explanation. One question, done properly.

ModerateAnatomyStellate ganglion block and Horner syndromeFRCA Primary

A patient receives stellate ganglion block for complex regional pain syndrome. Soon afterwards she develops ptosis, miosis and anhidrosis on the same side. Which structure has been blocked?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: E — Cervical sympathetic chain

Horner syndrome after stellate ganglion block reflects blockade of the cervical sympathetic chain. Recurrent laryngeal nerve block would more likely cause hoarseness. Phrenic nerve block causes hemidiaphragm paresis. The teaching point is that Horner syndrome can be an expected sign of successful cervical sympathetic blockade.

Reference: RCoA Primary FRCA Syllabus 2026; Anatomy for Anaesthetists