Right ventricular arrhythmia in the absence of arrhythmogenic dysplasia: MR imaging of myocardial abnormalities

Radiology. 1998 Jun;207(3):743-51. doi: 10.1148/radiology.207.3.9609899.


Purpose: To evaluate right ventricular abnormalities with magnetic resonance (MR) imaging in patients with arrhythmia but without arrhythmogenic dysplasia.

Materials and methods: In 53 patients being evaluated for right ventricular arrhythmia and 15 control subjects, MR imaging was performed to evaluate fixed thinning, fatty replacement, or reduced systolic wall thickening or motion. A diagnosis of idiopathic right ventricular outflow tract tachycardia or indeterminate was assigned for each patient, and the severity of arrhythmia was categorized.

Results: Right ventricular abnormalities were revealed in 32 (60%) of the 53 patients: fixed thinning in 27 (84%), fatty replacement in eight (25%), and reduced wall thickening or motion in 31 (97%). Right ventricular abnormalities were found in 35 (76%) of 46 patients with idiopathic right ventricular outflow tract tachycardia and in seven (39%) of 18 patients with indeterminate diagnoses (P = .022).

Conclusion: Mild right ventricular abnormalities are likely sources for arrhythmias, even in the absence of arrhythmogenic right ventricular dysplasia.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Arrhythmogenic Right Ventricular Dysplasia / diagnosis
  • Chi-Square Distribution
  • Female
  • Heart Ventricles / pathology
  • Humans
  • Magnetic Resonance Imaging* / instrumentation
  • Magnetic Resonance Imaging* / methods
  • Magnetic Resonance Imaging* / statistics & numerical data
  • Male
  • Middle Aged
  • Myocardium / pathology*
  • Prospective Studies
  • Sensitivity and Specificity
  • Statistics, Nonparametric
  • Tachycardia, Ventricular / diagnosis*
  • Ventricular Outflow Obstruction / diagnosis*