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. 2009 Oct 26;8:28. doi: 10.1186/1475-925X-8-28

Figure 1.

Figure 1

The PPG signals, in the finger distal to the cuff (below) and in the contralateral finger (above) as a function of the time, during the deflation period, when cuff pressure decreases to below SBP value. The vertical lines show the time of minima and maximum derivative in the PPG pulses in the free finger.