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Related Experiment Videos

Spinal anesthesia and lumbar lordosis.

M R Logan1, G B Drummond

  • 1Department of Anaesthetics, Royal Infirmary, Edinburgh, Scotland.

Anesthesia and Analgesia
|April 1, 1988
PubMed
Summary

Maintaining hip flexion after intrathecal hyperbaric bupivacaine injection did not significantly alter anesthetic blockade height. Bimodal block distribution was observed in both groups, with minimal cardiovascular side effects.

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Area of Science:

  • Anesthesiology
  • Neurosurgery
  • Pharmacology

Background:

  • Intrathecal hyperbaric bupivacaine is commonly used for spinal anesthesia.
  • Lumbar lordosis can influence the spread of hyperbaric spinal anesthetic agents.
  • Techniques to reduce lumbar lordosis may affect anesthetic block height.

Purpose of the Study:

  • To investigate the effect of sustained hip flexion after intrathecal hyperbaric bupivacaine injection on the height of anesthetic blockade.
  • To compare the spread of anesthetic blockade between two different patient positioning techniques.

Main Methods:

  • Two groups of 20 patients received intrathecal hyperbaric bupivacaine 0.5% (3.0 ml) while in a lateral position with hips flexed at 90 degrees.
  • Group F maintained hip flexion for 5 minutes after turning supine; Group S straightened hips before turning supine.
  • Blockade height was assessed, and cardiovascular side effects were monitored.

Main Results:

  • Sustained hip flexion did not significantly limit the height of the anesthetic blockade.
  • Marked bimodality in blockade height distribution was observed in both groups (P < 0.05), with peaks at T4/T9 (Group F) and T3/T9 (Group S).
  • Cardiovascular side effects were minimal and comparable between the two groups.

Conclusions:

  • The technique of reducing lumbar lordosis via hip flexion does not significantly alter the spread of intrathecal hyperbaric bupivacaine.
  • Bimodal distribution of anesthetic blockade is a notable characteristic in this context.
  • Both positioning techniques are associated with minimal cardiovascular complications.

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