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Background: Peripheral-muscle-fractional-oxygen-extraction (pFOE) and peripheral-muscle-fractional-tissue-oxygen-extraction (pFTOE) are often equated, since both parameters are measured with near-infrared-spectroscopy (NIRS) and estimate oxygen extraction in the tissue. The aim was to investigate the comparability of both parameters and their potential regarding detection of impaired microcirculation. Methods: Term and preterm neonates with NIRS measurements of upper (UE) and lower extremities (LE) were included. pFOE was calculated out of peripheral-muscle-mixed-venous-saturation (pSvO2), measured with NIRS and venous occlusion, and arterial oxygen saturation (SpO2). pFTOE was calculated out of peripheral-muscle-tissue-oxygen-saturation and SpO2. Both parameters were compared using Wilcoxon-Signed-Rank-test and Bland–Altman plots. Results: 341 NIRS measurements were included. pFOE was significantly higher than pFTOE in both locations. Bland–Altman plots revealed limited comparability, especially with increasing oxygen extraction with higher values of pFOE compared to pFTOE. Conclusion: The higher pFOE compared to pFTOE suggests a higher potential of pFOE to detect impaired microcirculation, especially when oxygen extraction is elevated.

ZusammenfassungDieser Artikel untersucht die Verbindung von Erzählen und Argumentieren im Kontext politischer Reden zur Coronakrise. Die qualitative Untersuchung basiert auf einem Korpus von 650 Kommentaren, die Nutzer*innen im Anschluss an die sogenannten Lockdown-Reden von Sebastian Kurz und Angela Merkel im März 2020 auf verschiedenen Social-Media-Plattformen veröffentlicht haben. In den Kommentaren lassen sich Formen des fragmentarischen Erzählens nachvollziehen, das zur Stützung von Argumenten und zur Positionierung im kommunikativen Gefüge der beteiligten Akteure im Kontext der verkündeten Lockdown-Maßnahmen dient.

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