Quantitative detection of myocardial ischaemia by stress echocardiography; a comparison with SPECT

Table 3 Results for the respective quantitative variables and visual interpretations (QV), A-reserve, (A-r), β-reserve, (β-r) and Axβ-reserve (Axβ-r), visual RTP-ASE interpretation with complementary wall motion (Vis 1) and with sole perfusion interpretation (Vis 2).

QV	Coronary Territory	Acc (%)	Sens (%)	Spec (%)	PPV (%)	NPV (%)	kappa	AUC
A	All	43	39	75	11	94	NS	0.529 NS
A	LAD	67	66	75	27	94	0.237 *	0.705 NS
A	LCx	29	28	50	6	87	NS	0.229 NS
A	RCA	32	28	100	8	100	NS	0.518 NS
β	All	80	83	56	25	95	0.249 ***	0.678 *
β	LAD	82	83	75	43	95	0.442 **	0.773 *
β	LCx	82	94	25	25	94	NS	0.590 NS
β	RCA	72	74	50	11	96	NS	0.666 NS
Axβ	All	75	77	63	22	95	0.213 **	0.665 *
Axβ	LAD	82	83	75	43	95	0.442 **	0.818 **
Axβ	LCx	90	96	25	33	94	NS	0.404 NS
Axβ	RCA	58	57	75	10	97	NS	0.680 NS
A	Patient wise	35	11	100	29	11	NS	NA
β	Patient wise	60	53	79	38	87	0.233 *	NA
Axβ	Patient wise	47	38	73	31	79	NS	NA
Vis 1	All	93	90	93	59	99	0.67 ***	NA
Vis 1	LAD	87	90	86	53	98	0.59 ***	NA
Vis 1	LCx	94	100	94	56	100	0.68 ***	NA
Vis 1	RCA	96	75	100	100	98	0.85 ***	NA
Vis 1	Patient wise	90	89	90	76	96	0.75 ***	NA
Vis 2	All	92	94	92	55	99	0.67 ***	NA
Vis 2	LAD	86	100	83	53	100	0.61 ***	NA
Vis 2	LCx	94	100	94	57	100	0.68 ***	NA
Vis 2	RCA	95	75	97	60	98	0.64 ***	NA
Vis 2	Patient wise	89	91	88	71	97	0.73 ***	NA

A, peak signal intensity; β, myocardial blood flow velocity; Axβ, myocardial blood flow; Acc, accuracy; Sens, sensitivity; Spec, specificity; PPV, positive predictive value; NPV, negative predictive value; AUC, area under the curve; * = p < 0.05; ** = p < 0.01; *** = p < 0.001; NS, not significant; NA, not applicable. Bold indicates significance and italics indicates not significant or not applicable.

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