In section 8, Other Procedures, a new method value Near Infrared Spectroscopy for the body region, Circulatory System, has been created in table 8E0 to describe the utilization of Near Infrared Spectroscopy (NIRS) tissue oxygenation imaging. NIRS is used to measure or monitor tissue oxygen saturation levels when assessing tissue viability during surgical procedures or during the postoperative management period using a non-invasive external approach.
|2 Circulatory System||D Near Infrared Spectroscopy|
NIRS technology assesses tissue viability by measuring approximate values of tissue oxygen saturation. The measurements provided can assist with decisions to determine tissue survival. This information can be valuable during repair and closure procedures in treatment of traumatic injuries, and to assess limb preservation and tissue survival in a wide range of wounds, tissue loss, tissue repair and grafting procedures, and in ongoing post-operative monitoring.
Two examples of this technology are the SnapshotNIR handheld device and the Intra Ox Handheld Tissue Oximeter. The SnapshotNIR device is positioned at a pre-set distance from the surface of the skin to illuminate an area of tissue with a sequence of near infrared wavelengths and then measures the back reflected light at each wavelength. There is no need for attaching probes or puncturing a vessel. The reflectance sequence is processed to provide an estimate of the relative concentrations of oxyhemoglobin and deoxyhemoglobin where the ratio is used to determine oxygen saturation levels (StO2) in the tissue. Quantitative StO2 values across the tissue area are imaged for analysis and stored for comparison to prior and future measurements. SnapshotNIR provides a color image with the ability for the user to observe quantitative StO2 values across the tissue area, by selecting areas of interest in the image.
The Intra Ox Handheld Tissue Oximeter has a disposable sensor that provides a measure of StO2. This device places the light delivery and collection optics (contained within the sensor) directly on the skin. The Intra Ox system provides a numerical StO2 value for a small amount of tissue beneath.