Table 2.

Comparison of Performance of ECG and Acoustic Cardiographic Parameters to Detect LV Systolic Dysfunction and Elevated LV Filling Pressures, All QRS Durations

			For Elevated LV Filling Pressure
	For EF < 50%		All EF		EF < 50%
	AUC	Sensitivity at 90% Specificity	AUC	Sensitivity at 90% Specificity	AUC	Sensitivity at 90% Specificity
QRS duration	0.82	59% (113 ms)	0.68	39% (151 ms)	0.87	67% (114 ms)
QR interval	0.80	55% (47 ms)	0.77	50% (59 ms)	0.89	74% (46 ms)
S3 strength	0.62	32% (5.1)	0.83	55% (5.3)	0.88	70% (5.0)
% EMAT	0.78	43% (12.3)	0.68	32% (14.4)	0.83	56% (12.4)
EMAT/LVST	0.80	48% (0.33)	0.72	40% (0.36)	0.85	62% (0.33)
S3 strength* QRS duration	0.80	57% (528)	0.84	50% (672)	0.97	95% (536)
Cornell voltage	0.69	34% (2363)	0.58	5% (3483)	0.75	55% (2348)
Cornell product	0.74	41% (245148)	0.59	6% (375212)	0.79	40% (252467)
Max (P negative area V1, V2)	0.47	6% (6589)	0.66	28% (5726)	0.62	16% (6511)
ST segment spatial vector magnitude*	0.77	41% (169)	0.65	15% (243)	0.82	52% (171)
QRSdur* Qrint* S3Strength*%EMAT	0.88	77% (199668)	0.84	55% (466666)	0.99	99% (196558)

*Spatial vector magnitude is the square root of (STJ20_aVF^∧2+STJ20_V2^∧2+STJ20_V5^∧2).

EMAT = electromechanical activation time; %EMAT = EMAT divided by the R to R interval; LVST = left ventricular systolic time.