Regional tissue oxygenation saturation has been shown to increase in innervated regions after sympathetic block. The aim of this prospective observational study was to evaluate the changes of regional tissue oxygenation saturation by near-infrared spectroscopy after successful femoral nerve block with ropivacaine and determine whether the changes of regional tissue oxygenation saturation can be affected by the concentration of ropivacaine.
Successful peripheral nerve blocks induce sympathetic blockade, which increases local blood flow by vasodilation. The relationship between successful femoral nerve block and the variation of regional tissue oxygenation saturation was unclear.
Study Type
OBSERVATIONAL
Enrollment
100
tissue oxygenation saturation
Union Hospital
Wuhan, Hubei, China
Regional tissue oxygenation saturation after successful femoral nerve block
rSO2
Time frame: at 5-minute intervals till 30 minutes after regional block
Pinprick sensory scores
A 3-level scale was used to grade the intensity of sensory block using pinprick stimulation: 0=normal sensation; 1=analgesia; 2=anesthesia.
Time frame: 5 minute before regional block and at 5-minute intervals till 30 minutes after regional block
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