Backflow of cerebrospinal fluid through a 25 gauge spinal needle after puncture of the arachnoid mater during initiation of spinal anaesthesia
Schematic drawing showing the principles of spinal anaesthesia.

Mild hypotension

- Spinal anaesthesia

Many anesthetic agents and techniques, including spinal anesthesia and most inhalational agents, produce significant vasodilation.

- Hypotension
Backflow of cerebrospinal fluid through a 25 gauge spinal needle after puncture of the arachnoid mater during initiation of spinal anaesthesia

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