Study individuals:
We enrolled consecutive patients who underwent CMR between Jan 2012- Dec
2017 and a transthoracic echocardiogram (TTE) within 1 month of the CMR
with no interval clinical event. The study cohort included five hundred
subjects at Mayo Clinic Arizona. The following Doppler echocardiographic
parameters for assessment of RV systolic function: Tricuspid annular
peak systolic excursion (TAPSE), lateral tricuspid annular systolic
velocity (S’), lateral RV free wall peak systolic strain (S), and RV
fractional area change (RV FAC), and cardiac MRI (RVEF) were acquired in
all the subjects. Subdivisions in the patient group are based on RVEF
measured by CMR: RVEF ≥ 45% (n = 333, Group A), RVEF 30-45% (n = 140,
Group B), and RVEF ≤ 30% (n = 27, Group C). All echocardiographic
parameters were reassessed by the investigators for the current study.