Comparisons of myocardial strain and strain rate in patients with heart failure with preserved and reduced ejection fraction using Feature Tracking of cine MR images
نویسندگان
چکیده
Methods All participants were prospectively recruited and underwent CMR in a 1.5 T scanner. LVEF < 45% and ≥45% were used to define HFrEF and HFpEF, respectively. Dilated cardiomyopathy was the primary cause for HFrEF. HF status was confirmed with B-type natriuretic peptide (BNP) > 400 pg/ml. Patients with myocardial infarction were excluded. Myocardial circumferential strain (CST) and strain rate (CSR) was analyzed in mid LV of the short axis plane and the longitudinal strain (LST) and strain rate (LSR) in 4-chamber view of the SSFP cine images using feature tracking (CIM software, Auckland, New Zealand). LV end diastolic pressure (LVEDP) was estimated using normalized left atrial transition time from time-intensity curves of the first pass perfusion images.
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