Validation of a rapid semi-automated method to assess left atrial longitudinal phasic strains on cine cardiovascular magnetic resonance imaging

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 ε_s, %	0.94	0.79	0.98	27.6
Fast reservoir SR_s, 1/s	0.93	0.76	0.98	1.26
FT reservoir ε_s, %	0.90	0.82	0.88	26.7
FT reservoir SR_s, 1/s	0.84	0.80	0.80	1.24
Total LAEF, %	0.88	0.68	0.96	51.1
Conduit function
Fast conduit ε_e, %	0.92	0.76	0.96	12.4
Fast conduit SR_e, 1/s	0.96	0.93	0.90	−1.42
FT conduit ε_e, %	0.91	0.82	0.86	14.3
FT conduit SR_e, 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 ε_a, %	0.79	0.80	0.66	15.6
Fast booster SR_a, 1/s	0.85	0.76	0.82	−1.80
FT booster ε_a, %	0.76	0.65	0.84	14.3
FT booster SR_a, 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

ISSN: 1532-429X