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. 2023 Jan 9;13:442. doi: 10.1038/s41598-022-27342-0

Figure 2.

Figure 2

Patient in-hospital movement and examples of SpO2 signal in critical and non-critical cases. (a) Frequent in-hospital movement of ward monitored patients. For non-severe patients monitoring is only performed part time and a patient might be transferred or discharged depending on his health status. Image produced with BioRender.com. (b) SpO2 and EtCO2 signals of a non-critical and a critical COVID-19 patient with an initiation of ventilation. The transition between non-ventilated and ventilated state is clearly visible after an event of intense desaturation. Non-mechanically ventilated area is indicated in green and mechanically ventilated area is indicated in red, on the EtCO2 channel. (c) SpO2 signal of the same patients zoomed in on 1 h intervals, highlighted by black rectangles in panel (b).