Paramedian Incidence Angles in Spinal Anaesthesia

Condition(s) studied

Investigational drug(s) / intervention(s)

Measurement of needle insertion angles: Individualization of needle insertion angle depending on the skin to dural sac distance by means of visual guides and adapted protractors

Study summary

The objective here is to quantify the number of punctures and redirections during routine practice in the anesthesiology department, verify the final angle of incidence and the sac-skin distance by ultrasound, and determine the optimal, maximum, and minimum angles that would have allowed successful punctures. The objective is also to correlate ultrasound and plain X-ray distances, if available. These angles would then be inferred in advance in patients who must undergo spinal anesthesia, assessing whether this prior estimate reduces the number of punctures and redirections.

Eligibility

Primary outcome measure(s)

• Number of needle insertion attempts — From September 2025 to september 2026.
  Total number of times that the spinal needle is introduced in the skin

Trial sites (1)

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