This study aims to compare the alternative current and the direct current signal changes of photoplethysmography between both feet during one side lumbar sympathetic block. The hypothesis is that signal changes occur earlier than other indices to decide whether it is successful following lumbar sympathetic block on only one-side.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
DIAGNOSTIC
Masking
QUADRUPLE
Enrollment
25
unilateral lumbar sympathetic block at L3 level using 0.2% chirocaine under C-arm fluoroscopy
Department of Anesthesiology and Pain Medicine, Seoul National University Hospital
Seoul, South Korea
RECRUITINGIndex of sympathetic block
change of slope of signals of the alternative current and the direct current from foot The baseline is defined as the point of surgical drap. The end of procedure is decided when the temperature of foot is increased more than 2 degrees from baseline within 20 minutes after local anesthetics injection
Time frame: 1 minute at intervals from baseline through end of procedure
skin temperature changes
foot temperature change from baseline
Time frame: 1 minute at intervals during procedure
electrocardiogram
heart rate variability measurement
Time frame: 1 minute at intervals from baseline through end of procedure
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