Overview
Reflect Site-Specific Tissue Perfusion Non-Invasively
INVOS™ system technology gives you a non-invasive “window” to the body’s microvasculature; a direct and dynamic site of gas exchange that transports about half the body’s blood volume. Measuring blood oxygenation in the microvasculature results in sensitive and site-specific insights on perfusion adequacy or – with multi-sensor monitoring – perfusion distribution across the brain and body.
Unlike parameters that measure only venous or arterial blood, INVOS™ technology includes contributions from both in a 3:1 ratio, yielding a venous-weighted percent saturation. This provides real-time data about the balance or imbalance of oxygen supply and demand, thus reflecting venous oxygen reserve - the oxygen remaining after extraction by tissues and vital organs. Decreases in venous oxygen reserve can be a warning of developing pathology and deteriorating patient condition. Published adult data has shown that an rSO2 of 50 or a 20% decline from baseline are cause for concern and intervention, and an rSO2 of 40 or a 25% decline from baseline are associated with neurologic dysfunction and other adverse outcomes.1,2,3,4,5,6,7,8,9
The INVOS™ system utilises near-infrared light at wavelengths that are absorbed by haemoglobin (730 and 810 nm). Light travels from the sensor’s light emitting diode to either a proximal or distal detector, permitting separate data processing of shallow and deep optical signals. INVOS™ system’s ability to localise the area of measurement, called spatial resolution, has been empirically validated in human subjects.10 Data from the scalp and surface tissue are subtracted and suppressed, reflecting rSO2 in deeper tissues. This same concept applies to somatic monitoring.
The result is continuous, real-time adequacy of perfusion data in up to four sites of your choice.
