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Related Experiment Videos

Predicting successful brachial plexus block using changes in skin electrical resistance.

G B Smith1, G R Wilson, C H Curry

  • 1Odstock Hospital, Salisbury, Wiltshire.

British Journal of Anaesthesia
|May 1, 1988
PubMed
Summary
This summary is machine-generated.

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Skin electrical resistance increases rapidly after brachial plexus block, indicating sympathetic nervous system activity changes. This early rise in skin electrical resistance reliably predicts sensory loss following nerve blockade.

Area of Science:

  • Anesthesiology
  • Neuroscience
  • Dermatology

Background:

  • Skin electrical resistance (SER) correlates with skin sweating and sympathetic nervous system (SNS) activity.
  • Nerve damage or local anesthetic blockade elevates SER due to reduced sweating.

Purpose of the Study:

  • To investigate the temporal and spatial relationship between sympathetic nervous system (SNS) loss and sensory loss in the hand after brachial plexus block.
  • To determine if SER changes can serve as an early indicator of nerve blockade effectiveness.

Main Methods:

  • Brachial plexus block was performed on 44 patients using 1% lignocaine with adrenaline.
  • Skin electrical resistance was measured using an ohm meter before and after the block.
  • Onset of sympathetic and sensory loss was recorded.

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Main Results:

  • Skin electrical resistance increased significantly within 2 minutes of brachial plexus blockade.
  • The observed increase in SER was a reliable early indicator of subsequent sensory loss.
  • This SER increase preceded the onset of sensory loss, which was occasionally delayed.

Conclusions:

  • Increased skin electrical resistance is a rapid and reliable indicator of brachial plexus blockade.
  • SER monitoring can provide early evidence of sympathetic nervous system blockade and predict sensory loss in the hand.