Preprocessing Unevenly Sampled RR Interval Signals to Enhance Estimation of Heart Rate Deceleration and Acceleration Capacities in Discriminating Chronic Heart Failure Patients from Healthy Controls

Table 2

Variants of PRSA for DC and AC calculation.

Method	Description
Pan et al. [15] (DCm1/ACm1)	Select anchor points on rising or falling edge of RRI signal. Equations (4) and (7) are replaced by and , respectively.
Arsenos and Manis [16] (DCm2/ACm2)	RRI signal is represented by four successive RRI vectors. DC or AC is characterized by vector average: .; The vectors should satisfy for DC and for AC.
Nasario et al. [17] (DCm3/ACm3)	Removing points in RRI signal that change more than 20% on selecting anchor points. Equations (4) and (7) are replaced by and , respectively.