Inter-study reproducibility of cardiovascular magnetic resonance tagging

Table 2 Inter-study reproducibility of LV strain and strain rates

LV parameter	Slice	Exam 1	Exam 2	Mean difference (SD)	ICC	SEM	SDC
Ecc, %	Base	−14.2	−13.9	−0.2 (1.6)	0.74**	0.8	2.3
	Mid	−14.7	−15.2	0.5 (1.9)	0.73**	1.0	2.7
	Apex	−15.6	−15.01	−0.6 (1.2)	0.89**	0.4	1.1
Err, %	Base	18.4	19.1	−0.7(5.3)	0.2	4.7	13.1
	Mid	16.6	17.1	0.5 (4.1)	0.58*	2.7	7.4
	Apex	15.1	13.9	1.2 (6.8)	0.3	5.7	15.8
Lambda 1, %	Base	23.1	24.0	−1.1 (5.2)	0.4*	4.0	11.2
	Mid	22.8	23.1	0.3 (5.2)	0.6**	3.3	9.1
	Apex	21.2	23.2	2.04 (7.2)	0.47*	5.2	14.5
Lambda 2, %	Base	−16.1	−16.6	0.5 (1.9)	0.66**	1.1	3.1
	Mid	−17.2	−17.6	0.4 (2.3)	0.5*	1.6	4.5
	Apex	−18.7	−19.4	0.7 (2.8)	0.47*	2.0	5.6
Angle, α	Base	11.4	10.0	1.3 (4.8)	0.05	4.7	13.0
	Mid	13.3	12.1	1.1 (5.6)	0.05	5.5	15.1
	Apex	16.2	17.2	−0.9 (6.6)	0.06	6.4	17.7
Time to peak Ecc (ms)	Mid	295.8	306	−10.4 (81)	0.4 *	62.7	173.8
SSR (1/s)	Mid	−79.6	−85.1	5.4 (15.7)	0.58*	10.2	28.2
EDSR (1/s)	Mid	72.2	70.8	1.4 (43.7)	0.35*	35.2	97.6

SSR systolic circumferential strain rate, EDSR Early diastolic circumferential strain rate.
SD standard deviation of mean difference, ICC Intra-class correlation coefficient, SEM standard error of measurement, SDC Smallest detectable change.
** = p <0.0001, * = p <0.05.

ISSN: 1532-429X