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 5

Diagnostic ability of DC and AC.

	Cutoff value (ms)	Sensitivity (%)	Specificity (%)	Accuracy (%)	AUC	Ref.
DCconv	4.39	83.33	90.14	87.61	0.920	[10]
DCp	3.41	85.71	95.77	92.04	0.942
ACconv	−5.81	71.43	83.10	78.76	0.818
ACp	−3.33	88.10	92.96	91.15	0.923
DCm1	8.24	83.33	94.37	90.27	0.947	[15]
DCpm1	4.50	83.33	97.18	92.04	0.940
ACm1	−8.59	71.43	90.14	83.19	0.855
ACpm1	−4.79	85.71	91.55	89.38	0.920
DCm2	1.69	69.05	87.32	80.53	0.855	[16]
DCpm2	1.97	76.19	97.18	89.38	0.905
ACm2	−2.20	88.10	85.92	86.73	0.894
ACpm2	−2.19	83.33	91.55	88.50	0.918
DCm3	4.34	78.57	94.37	88.50	0.920	[17]
DCpm3	3.69	78.57	92.96	87.61	0.926
ACm3	−5.74	69.05	85.92	79.65	0.823
ACpm3	−3.39	85.71	94.37	91.15	0.924

Sensitivity, specificity, and accuracy of DC and AC are given under appropriate cutoff values. Subscripts m1 to m3 indicate the three calculation variants of DC and AC. The indices calculated from preprocessed RRI signals use the same resampling frequency of 2 Hz and optimal scales of 6 and 14 for DC and AC, respectively.