Comparison of near-infrared spectroscopy and tissue Po2 time series in patients after severe head injury and aneurysmal subarachnoid hemorrhage

Monitoring of local oxygen pressure in brain white matter (tipo(2)) and of local hemoglobin oxygen saturation (rSo(2)) with near-infrared spectroscopy (NIRS) are increasingly employed techniques in neurosurgical intensive care units. Using frequency-based mathematical method,,, the authors sought to ascertain whether both techniques contained similar information. Twelve patient,,; treated in the intensive care unit were included (subarachnoid hemorrhage, n = 3 traumatic brain injury, n = 9). A tipo(2) probe and an NIRS sensor were positioned over the frontal lobe with the most pathologic changes on initial computed tomography scan. The authors calculated coherence of tipo(2) and rSo(2). its overall density distribution, its distribution per data set, and its time evolution. The authors identified a band of significantly correlated frequencies (from 0 to 1.3 x 10(3) Hz) in more than 90% of the data sets for coherence and overall density distribution. Time evolution showed slow but marked changes of significant coherence, By means of spectral analysis the authors show that tipo(2) and rSo(2) signals contain similar information. albeit using completely different registration methodologies.