Association of cardiovascular magnetic resonance-derived circumferential strain parameters with the risk of ventricular arrhythmia and all-cause mortality in patients with prior myocardial infarction and primary prevention implantable cardioverter defibrillator

Table 2 Baseline CMR variables

	No appropriate ICD therapy (n = 91)	Appropriate ICD therapy (n = 30)	Survived or appropriate ICD therapy (n = 98)	Deceased without appropriate ICD therapy (n = 23)
LVEF, %	29 ± 9†	23 ± 10	28 ± 9	25 ± 10
Total scar size, g	48 ± 28	55 ± 25	47 ± 24*	60 ± 38
Scar core size, g	29 ± 22	33 ± 19	28 ± 17*	39 ± 31
Scar border size, g	19 ± 9*	23 ± 11	19 ± 10	21 ± 10
LV mass, g	151 ± 35	160 ± 42	152 ± 37	160 ± 35
LV end-diastolic volume, mL	291 ± 104	319 ± 96	290 ± 95	333 ± 128
Global strain, %	−14 ± 4†	−11 ± 3	−14 ± 4	−12 ± 4
Peak systolic strain rate, 1/s	−0.83 ± 0.27†	−0.66 ± 0.20	−0.81 ± 0.27*	−0.68 ± 0.24
Extent of impaired strain, %
Severely (<−5%)	15 ± 11*	20 ± 14	15 ± 11*	21 ± 14
Moderately (−5, −10%)	23 ± 10‡	30 ± 10	24 ± 11	26 ± 9
Mildly (−10, −15%)	23 ± 8	22 ± 7	23 ± 8	22 ± 7
Early diastolic strain rate, 1/s	0.79 ± 0.30*	0.64 ± 0.25	0.78 ± 0.29	0.68 ± 0.26
Late diastolic strain rate, 1/s	0.52 ± 0.24*	0.42 ± 0.20	0.52 ± 0.23*	0.40 ± 0.23
Sphericity index	0.54 ± 0.13	0.57 ± 0.17	0.54 ± 0.14	0.58 ± 0.17
Mechanical dispersion, ms	82 ± 24	83 ± 25	80 ± 24*	92 ± 21

Means ± standard deviations. *P < 0.05, †P < 0.01, ‡P < 0.001 vs. appropriate ICD therapy or all-cause mortality without appropriate ICD therapy. Missing values for sphericity index: n = 2 (no appropriate ICD therapy); n = 1 (appropriate ICD therapy); n = 2 survived or appropriate ICD therapy; n = 1 deceased without appropriate ICD therapy. LV: left ventricle. LVEF: left ventricular ejection fraction. Extent of impaired strain: percentage of LV segments with strain > − 15%

ISSN: 1532-429X