Comparison of frequency-domain and continuous-wave near-infrared spectroscopy devices during the immediate transition.

Background: Non-invasive monitoring of cerebral tissue oxygen saturation (rcSO) during transition is of growing interest. Different near-infrared spectroscopy (NIRS) techniques have been developed to measure rcSO. We compared rcSO values during the immediate transition in preterm neonates measured with frequency-domain NIRS (FD-NIRS) with those measured with continuous-wave NIRS (CW-NIRS) devices in prospective observational studies.