Figure 2 | Scientific Reports

Figure 2

From: Lung-to-finger circulation time can be measured stably with high reproducibility by simple breath holding method in cardiac patients

Figure 2

Typical trace during LFCT measurement. We asked the patients to hold their breath for 20 s. After breath holding, they restart their breathing according to the sign from the attending researcher. The time from the restart of breathing to the minimum value of the difference of R and IR (≈SpO2) was defined as LFCT. In this case, LFCT was 19.2 s. LFCT: lung to finger circulation time, R: red light, IR: infrared light.

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