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. 2021 Oct 8;8:737810. doi: 10.3389/fmed.2021.737810

Figure 3.

Figure 3

Change of EIT-based parameters for spontaneous breathing at different time points. T1, before HFNC; T2, 30 min after HFNC started; T3, 1 h after HFNC started. All values were normalized to that at T1. The boxes mark the quartiles with median marked red, while the whiskers extend from the box out to the most extreme data value within 1.5* the interquartile range of the sample. The red crosses are outliers. Green dashed lines marked the value of 0. RSBI, rapid shallow breathing index. Higher than 0 means the subject is breathing more rapidly or shallowly. MV, minute volume. Lower than 0 means the minute volume becomes less at T3. I:E, inspiration to the expiration time. Lower than 0 means the inspiration time is getting shorter.