Dynamic changes in injured myocardium, very early after acute myocardial infarction, quantified using T1 mapping cardiovascular magnetic resonance

Table 3 Dynamic changes of injured and remote myocardium within the first week following STEMI

Studied myocardium	Reperfusion time			Pairwise comparison (P value)
Studied myocardium	< 3 h	24 h	6 days	A*	B*	C*
T1 relaxation time (inc core) ^(b)ms	1404 ± 76	1345 ± 49	1384 ± 77	< 0.001	0.81	0.046
T1 relaxation time (remote) ^(b) ms	1189 ± 16	1182 ± 27	1181 ± 19	0.14	0.004	1.0
T1 relaxation time (exc core) ^(b)ms	1406 ± 71	1353 ± 55	1398 ± 67	< 0.001	1.0	0.001
Injured myocardium (AAR, LV %) on T1 map^(b)	37 ± 11	38 ± 11	42 ± 9	1.0	0.001	0.019
T1 core area^(b) (mm²)	0.15 ± 1.14	1.1 ± 1.14	0.84 ± 1.15	< 0.001	0.028	0.99
T1 core prevalence^{(c), a}	4 (13%)	15 (50%)	9 (41%)	–	–	–

^aP value is not presented because generalised linear mixed-effects model does not support analysis for categorical data. Data are presented as ^(b) mean ± SD, ^(c) total number and proportion. * A (comparison between < 3 & 24 h), B (comparison between < 3 h & 6 days), and C (comparison between 24 h & 6 days)

ISSN: 1532-429X