Quantification of myocardial blood flow with cardiovascular magnetic resonance throughout the cardiac cycle

Table 2 Estimates of MBF and MPR throughout the cardiac cycle

	*End-diastole*	*Early-systole*	*Mid-systole*	*End-systole*	*Early-diastole*	P
Global
Stress MBF	4.50 ± 0.91	4.03 ± 0.76	3.68 ± 0.67	3.31 ± 0.69	4.11 ± 0.83	p < 0.0001
Rest MBF	1.24 ± 0.19	1.28 ± 0.17	1.28 ± 0.17	1.27 ± 0.19	1.29 ± 0.19	p = 0.71
MPR	3.63 ± 0.95	3.19 ± 0.66	2.92 ± 0.66	2.62 ± 0.63	3.40 ± 0.92	p < 0.0001
LAD perfusion territory*
Stress MBF	4.38 ± 0.87	3.88 ± 0.78	3.59 ± 0.64	3.19 ± 0.67	3.99 ± 0.80	p < 0.0001
Rest MBF	1.25 ± 0.16	1.30 ± 0.14	1.24 ± 0.11	1.25 ± 0.13	1.21 ± 0.13	p = 0.14
MPR	3.54 ± 0.74	3.01 ± 0.60	2.91 ± 0.53	2.58 ± 0.58	3.35 ± 0.80	p < 0.0001
LCX perfusion territory*
Stress MBF	4.40 ± 0.94	3.93 ± 0.70	3.58 ± 0.67	3.21 ± 0.69	4.01 ± 0.85	p < 0.0001
Rest MBF	1.25 ± 0.08	1.28 ± 0.17	1.24 ± 0.14	1.24 ± 0.14	1.23 ± 0.12	p = 0.60
MPR	3.52 ± 0.73	3.12 ± 0.65	2.93 ± 0.63	2.60 ± 0.56	3.29 ± 0.85	p < 0.0001
RCA perfusion territory*
Stress MBF	4.55 ± 0.90	4.13 ± 0.76	3.78 ± 0.67	3.41 ± 0.69	4.21 ± 0.85	p < 0.0001
Rest MBF	1.33 ± 0.15	1.38 ± 0.17	1.38 ± 0.20	1.39 ± 0.19	1.33 ± 0.19	p = 0.50
MPR	3.46 ± 0.78	3.03 ± 0.60	2.78 ± 0.60	2.49 ± 0.57	3.24 ± 0.83	p < 0.0001

*Additionally there were no significant differences in mean perfusion values (MBF or MPR) between territories at any point in the cardiac cycle (all p values >0.05). MBF = myocardial blood flow in ml/min/g; MPR = myocardial perfusion reserve; LAD = left anterior descending; LCX = left circumflex; RCA = right coronary artery.

ISSN: 1532-429X