A novel approach to determine aortic valve area with phase-contrast cardiovascular magnetic resonance

Table 2 TTE, invasive and CMR measurements

TTE, n	All patients (n = 50)	Low-flow (n = 24)	Normal-flow (n = 26)	p-value
Ejection fraction, %	60 ± 9	58 ± 10	62 ± 8	0.137
SVI (continuity equation), ml/m²	37 ± 11	29 ± 5	45 ± 7	< 0.001
MPG, mmHg	37 ± 17	30 ± 11	42 ± 19	0.010
PPG, mmHg	58 ± 25	49 ± 17	67 ± 27	0.005
AVA (continuity equation), cm²	0.84 ± 0.23	0.71 ± 0.19	0.90 ± 0.22	0.002
Aortic regurgitation, n (%)	30 (60)	14 (58)	16 (62)	0.624
Mitral regurgitation, n (%)	40 (80)	20 (83)	20 (77)	0.258
Cardiac catheterization, n	50	24	26
SVI (Fick), ml/m²	30 ± 14	28 ± 5	35 ± 6	0.005
MPG, mmHg	41 ± 19	37 ± 12	45 ± 23	0.139
PPG, mmHg	48 ± 27	41 ± 14	54 ± 34	0.081
AVA (Fick), cm²	0.70 ± 0.23	0.68 ± 0.17	0.71 ± 0.27	0.583
Cine-CMR, n	46	23	23
LV ejection fraction, %	65 ± 15	61 ± 18	68 ± 9	0.297
SVI, ml/m²	45 ± 9	41 ± 9	50 ± 7	0.001
EDVI, ml/m²	72 ± 23	70 ± 30	75 ± 15	0.468
ESVI, ml/m²	28 ± 22	31 ± 30	25 ± 12	0.324
LVMI, g/m²	81 ± 22	79 ± 20	83 ± 24	0.668
PC CMR, n	50	24	26
SVI, ml/m²	45 ± 14	41 ± 13	49 ± 15	0.046
MPG, mmHg	22 ± 10	19 ± 9	24 ± 10	0.042
PPG, mmHg	64 ± 29	56 ± 28	70 ± 29	0.064
AVA, cm²	0.78 ± 0.25	0.79 ± 0.23	0.76 ± 0.27	0.736

AVA aortic valve area, CMR cardiovascular magnetic resonance, cont. equ. continuity equation, EDVI end-diastolic volume index, ESVI end-systolic volume index, LVMI left ventricular mass index, MPG mean pressure gradient, PC-CMR phase-contrast-cardiovascular magnetic resonance, PPG peak pressure gradient, SVI stroke volume index, TTE transthoracic echocardiography

ISSN: 1532-429X