[Near infrared spectroscopy: a noninvasive optical method for monitoring cerebral oxygenation and hemodynamics].

The Near Infrared Spectroscopy (NIRS) has been established as a non-invasive method for monitoring the oxygenation state of human brain at the bedside. This possible by observing spectral changes in the tissue caused by presence of oxygenated hemoglobin, deoxygenated hemoglobin and cytochrome aa3. In this paper the technical data of the NIRS instrument and its clinical application particularly in investigation of cerebral oxygenation and hemodynamic has been described.