Brachial Plexus Block Clinical Trial
Official title:
The Effects of Difference in Pupil Size Between Bilateral Eyes on Cardiac Sympathetic Nervous Activity Following Interscalene Brachial Plexus Block
This study evaluates the effects of Horner's syndrome on cardiac autonomic nervous activity after interscalene brachial plexus block. Cardiac autonomic nervous activity and bilateral pupil diameters will be measured in a scotopic light condition, 30 minutes after interscalene brachial plexus block under ultrasound guidance and 15 minutes after the subsequent sitting position.
Stellate ganglia provide sympathetic fibers to the heart. Ipsilateral stellate ganglion block accompanied by interscalene brachial plexus block causes Horner's syndrome presenting with miosis, ptosis, and anhidrosis. The extent of Horner's syndrome can be represented by the difference in pupil diameter between bilateral eyes. Cardiac autonomic nervous activity affected by stellate ganglion block can be measured by calculation of heart rate variability parameters. ;
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