Cardiac magnetic resonance imaging findings in patients with right ventricular outflow tract premature contractions

19 patients (mean age 44 years, 13 males) with frequent (> 100 per hour), monomorphic (left bundle branch block and inferior axis morphology) extrasystoles arising from the right ventricular outflow tract, and 10 healthy volunteers (mean age 36.7 years, 4 males) without structural heart disease.

Cardiac magnetic resonance imaging (1 or 1.5 Tesla) including spin-echo and gradient-echo sequences

Healthy volunteers without structural heart disease

Presence of structural and dynamic abnormalities of the right and left ventricles (reduced wall thickness, systolic bulging, and decreased systolic thickening) and end-diastolic diameters of the right ventricular outflow tractsurrogate