Table 4.

Utility of fast left atrial strain and strain rate parameters, as well as volumetric measurements to differentiate patients with HCM, HFpEF and HFmrEF from controls^a

Variables	AUC	Sensitivity	Specificity	Threshold
Reservoir function
Fast reservoir εs, %	0.94	0.79	0.98	27.6
Fast reservoir SRs, 1/s	0.93	0.76	0.98	1.26
FT reservoir εs, %	0.90	0.82	0.88	26.7
FT reservoir SRs, 1/s	0.84	0.80	0.80	1.24
Total LAEF, %	0.88	0.68	0.96	51.1
Conduit function
Fast conduit εe, %	0.92	0.76	0.96	12.4
Fast conduit SRe, 1/s	0.96	0.93	0.90	−1.42
FT conduit εe, %	0.91	0.82	0.86	14.3
FT conduit SRe, 1/s	0.93	0.82	0.96	−1.14
Passive LAEF, %	0.76	0.75	0.74	24.3
Booster pump function
Fast booster εa, %	0.79	0.80	0.66	15.6
Fast booster SRa, 1/s	0.85	0.76	0.82	−1.80
FT booster εa, %	0.76	0.65	0.84	14.3
FT booster SRa, 1/s	0.77	0.88	0.58	−1.94
Active LAEF, %	0.78	0.80	0.68	39.3

^aResults of the receiver operating characteristic (ROC) analysis with area under the curve (AUC), sensitivity, specificity and threshold. ε left atrial strain, SR left atrial strain rate, FT feature tracking, LAEF left atrial emptying fraction. Italic values indicate the best predictors of phasic LA function as determined by AUC