Comparison of Two Devices Using Near-infra Red Spectroscopy During a Vascular Occlusion Test

Study Overview
=================
Brief Summary
-----------------
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™.

Detailed Description
-----------------
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.

Official Title
-----------------
Comparison of Two Devices Using Near-infra Red Spectroscopy for the Measurement of Tissue Oxygenation During a Vascular Occlusion Test (INVOS® Versus Inspectra™)

Conditions
-----------------
Healthy

Intervention / Treatment
-----------------
* Device: vascular occlusion test
* Device: vascular occlusion test


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: healthy subject Exclusion Criteria: age under 18 years old with arteriovenous fistula with peripheral vessel disease taking vasoactive drug with a skin ailment with HTN, DM with diagnosed heart disease

Ages Eligible for Study
-----------------
Minimum Age: 26 Years
Maximum Age: 41 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: vascular occlusion test<br>The pediatric SomaSensor™ probe of INVOS® and the 15-mm sensor of InSpectra™ are placed on each thenar muscle in the same subject. The side on which the probe will be placed is randomly determined. INVOS® updates data every 5 s and data (SrO2) will be manually recorded. The data of InSpectra™ (StO2) are automatically collected and sampled every 2 s. Vascular occlusion test (VOT) is done as follows:Adult-size blood pressure cuffs are placed around each upper arm. The both cuffs are simultaneously inflated to 30 mmHg above the initial systolic blood pressure and kept inflated until the SrO2 or StO2 decreased to 40%. When the value reaches 40% or just below it, the cuff on the same side is deflated rapidly. The data will be collected until the SrO2 and StO2 values returned to the baseline. | Device: vascular occlusion test<br>* Using Invos® probe attacted to one thenar muscle, tissue oxgyenation is measured by VOT.<br>Device: vascular occlusion test<br>* Using Inspectra™ probe attacted to another thenar muscle, tissue oxgyenation is measured by VOT.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 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. | 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. | Until basline tissue oxygenation value was achieved | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 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. | Until basline tissue oxygenation value was achieved | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Measures, near-Infrared spectroscopy, ischemia, reperfusion