Hyperbaric Spinal Block Height Position — FRCA Primary MCQ

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ModeratePharmacology - AnalgesicsHyperbaric Spinal Block Height PositionFRCA Primary

In spinal anaesthesia the level of block is determined by several factors. Which of the following is the most important determinant of block height with a hyperbaric solution?

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Correct answer: E — Patient position during and after injection

With hyperbaric solutions patient position is the most important determinant of block height because gravity determines the direction of spread. The dose and volume also contribute. Other factors: spinal anatomy (curvatures) / CSF volume (reduced in pregnancy/obesity → higher block) / site of injection / needle direction / and speed of injection. With isobaric solutions dose is the primary determinant.

Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care