Tissue oxygen saturation is non-invasively measured using near-infrared spectroscopy, by two device, INVOS®(somanetics Corporation, USA ) and InSpectra™ (Hutchinson Technology, USA). Each probes are attached to both thenar muscles and vascular occlusion test (VOT) is performed. The investigators will compare the Invos® data to InSpectra™ to investigate whether tissue oxygen saturation values by INVOS® can substitute for InSpectra™.
Tissue oxygen saturation is non-invasively measured using near-infrared spectroscopy, by two device, INVOS®(somanetics Corporation, USA ) and InSpectra™ (Hutchinson Technology, USA). InSpectra™ was introduced later than INVOS®. With InSpectra™, clinicians have used a vascular occlusion test (VOT) to evaluate dynamic changes in tissue oxygen saturation during ischemia and reperfusion, and thus, microcirculatory function. There have been little data about VOT using INVOS®, although it is more popular device. We hypothesized that there would be a difference between the values from INVOS® and InSpectra™. The aim of this study is to evaluate changes in tissue oxygen saturation in the thenar muscle during VOT using INVOS® and comapre it to InSpectra™ in a normal population.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
DOUBLE
Enrollment
20
Using Invos® probe attacted to one thenar muscle, tissue oxgyenation is measured by VOT.
Using Inspectra™ probe attacted to another thenar muscle, tissue oxgyenation is measured by VOT.
Change of Tissue Oxygenation Value During Ischemia and Reperfusion Period Until Basline Value Was Achieved
During vascular occlusion test, the changes of StO2 and SrO2 values can divided into 3 epoch; Desaturation, Reoxygenation and Reactive hyperemia. After data collection, the rate of desaturation and reoxygenation were calculated.
Time frame: Until basline tissue oxygenation value was achieved
Sum of Tissue Oxygenation Value Which Above Basline Value After Reperfusion Period Until Basline Value Was Achieved
During vascular occlusion test, the changes of StO2 and SrO2 values can divided into 3 epoch; Desaturation, Reoxygenation and Reactive hyperemia. After data collection, the rate of desaturation and reoxygenation were calculated.
Time frame: Until basline tissue oxygenation value was achieved
Baseline, Miminum and Maximum Tissue Oxygenation Value Measured by INVOS® (SrO2) Until Basline Value Was Achieved
Before VOT. basline StO2 and SrO2 were recorded and compared each other. During VOT, minimum/maximum StO2 and SrO2 were also recorded and compared each other.
Time frame: Until basline tissue oxygenation value was achieved
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