Algorithm 1: Delineation of ECG feature points.

Input:  $V_{ecg}:$ Vector of ECG data points with amplitude, $S_r:$ ECG data sampling rate,  $H_r:$ Heart rate, $RFV:$ Set of referenced feature values.  Output:  $F_{ecg}=\{P,Q,R,S,T\}:$ ECG feature point set.  Notations:  ${\zeta }_{pt}$: Maximum amplitude data point,  $cn{R}_{pts}$: Candidate R points,  $X_{rg}$: Range of points to locate point X, where $X\in \{P,Q,S,T\}$,  $\alpha$: User defined error margin constant,  $\sigma R_{pt}\in (0,1)$: Constant to detect R points,  $F_{ecg}^a$: ECG feature point set for $a^{th}$cardiac cycle. 1 Initialize $F_{ecg}=null$; 2 Estimate cardiac cycle length: $CL=\frac{S_r}{H_r}$; 3 Calculate # of cardiac cycles: $CCs=\frac{\left|V_{ecg}\right|}{CL}$; 4 Select maximum amplitude data point: ${\zeta }_{pt}$ $=max(V_{ecg}^1,\dots ,V_{ecg}^{\left|V_{ecg}\right|})$; 5 for $a=1$ to $CCs$ do 6  Initialize $F_{ecg}^a=null$; 7  Select candidate R points: $cn{R}_{pts}=(V_{ecg}^j\ge \sigma R_{pt}\ast {\zeta }_{pt})$, $\forall j\in V_{ecg}$; 8  $R_{pt}=max(cn{R}_{pts})$; // Delineation of feature point R.; 9  $F_{ecg}^a=F_{ecg}^a\cup R_{pt}$; 10  $Q_{rg}=\left(R_{pt}-({\displaystyle \frac{\Delta QR{S}_{wv}\ast S_r}{2}}+\alpha ),R_{pt}\right)$; 11  $Q_{pt}=min(V_{ecg}^j)$, $\forall j\in Q_{rg}$; // Delineation of feature point Q.; 12  $F_{ecg}^a=F_{ecg}^a\cup Q_{pt}$; 13  $P_{rg}=\left(R_{pt}-(\Delta P{R}_{inv}\ast S_r+\alpha ),R_{pt}\right)$; 14  $P_{pt}=max(V_{ecg}^j)$, $\forall j\in P_{rg}$; // Delineation of feature point P.; 15  $F_{ecg}^a=F_{ecg}^a\cup P_{pt}$; 16  $S_{rg}=\left(R_{pt},R_{pt}+({\displaystyle \frac{\Delta QR{S}_{wv}\ast S_r}{2}}+\alpha )\right)$; 17  $S_{pt}=min(V_{ecg}^j)$, $\forall j\in S_{rg}$; // Delineation of feature point S.; 18  $F_{ecg}^a=F_{ecg}^a\cup QR{S}_{pt}$; 19  $T_{rg}=\left(R_{pt},R_{pt}+(\Delta Q{T}_{inv}\ast S_r-{\displaystyle \frac{\Delta QR{S}_{wv}\ast S_r}{2}}+\alpha )\right)$; 20  $T_{pt}=max(V_{ecg}^j)$, $\forall j\in T_{rg}$; // Delineation of feature point T.; 21  $F_{ecg}^a=F_{ecg}^a\cup T_{pt}$; 22  $F_{ecg}=F_{ecg}\cup F_{ecg}^a$; 23 endfor 24 return $F_{ecg}$;