ESP Block Mechanism — FRCA Final MCQ

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HardRegional AnaesthesiaESP Block MechanismFRCA Final

An erector spinae plane block at T5 is performed for VATS. What is the primary analgesic mechanism?

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Correct answer: D — Spread into paravertebral space blocking ventral and dorsal rami

ESP block deposits LA deep to erector spinae muscle. Primary analgesia via spread through costotransverse foramina into paravertebral space, blocking ventral and dorsal rami. Produces somatic and some visceral analgesia. Supported by cadaveric and MRI evidence.

Reference: BJA Education – 2023 – Erector spinae plane block: mechanisms