Algorithm 3 Pseudo-Code: Deriving PPG Derivatives

Inputs: PPG, ABP, Signal_Length 1.1.1 Normalize both signals 1.2.1 PPG_Size = size(PPG) 1.3.1 ABP_Size = size(ABP) 1.4.1 if (PPG_Size(1) or ABP_Size(1)) > 1 then Transpose 2.1.1 Initialize Time_Vector = linspace(1, length(PPG), length(PPG)) 2.2.1 [peaks_PPG, peak_locations_PPG] = findpeaks(PPG) 2.3.1 num_peaks_PPG = length(peaks_PPG) 2.4.1 std_peaks_PPG = std(peaks_PPG) 2.5.1 std_peaks_dist_PPG = std(peak_locations_PPG) 2.6.1 [peaks_ABP, peak_locations_ABP] = findpeaks(ABP) 2.7.1 num_peaks_ABP = length(peaks_ABP) 2.8.1 std_peaks_ABP = std(peaks_ABP) 2.9.1 std_peaks_dist_ABP = std(peak_locations_ABP) 3.1.1 Initialize thresholds 3.2.1 if (std_peaks_PPG, std_peaks_dist_PPG, std_peaks_ABP, std_peaks_dist_ABP, num_peaks_PPG, num_peaks_ABP) satisfies thresholds then Decision = 0 3.2.2 else Decision = 1 Outputs: Decision (0 or 1)