An index of myocardial performance applied to the right ventricle of Boxers with arrhythmogenic right ventricular cardiomyopathy.
OBJECTIVE
To use an index of myocardial performance (IMP) to assess right ventricular function in Boxers with arrhythmogenic right ventricular cardiomyopathy (ARVC).


METHODS
22 Boxers (12 Boxers with ARVC diagnosed by the detection of > or = 1,000 ventricular premature complexes (VPCs)/24 h and 10 Boxers with < or = 5 VPCs/24 h (control dogs). Procedures-Pulsed-wave Doppler recordings of tricuspid inflow and pulmonic outflow were acquired. Preejection period (PEP), ejection time (ET), PEP/ET, and IMP were determined for the right ventricle by use of data from separate cardiac cycles.


RESULTS
A significant difference was not identified between groups for right ventricular PEP, right ventricular ET, right ventricular PEP/ET, or right ventricular IMP. Right ventricular IMP was not significantly correlated with VPC number (r = 0.21) or VPC grade (r = -0.3) in Boxers with ARVC.


CONCLUSIONS
Boxers with ARVC did not have significant differences in right ventricular IMP, compared with results for control Boxers. This would suggest that right ventricular dysfunction does not develop in Boxers with ARVC or that a more severe phenotype of the disease may be necessary for detection of dysfunction. Additional studies that use more sensitive techniques to evaluate myocardial function may be warranted.
Baumwart
Ryan D
RD
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
Meurs
Kathryn M
KM
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000662:veterinary*; D009202:Cardiomyopathies / Q000503:physiopathology* / Q000662:veterinary; D004283:Dog Diseases / Q000503:physiopathology*; D004285:Dogs; D006334:Heart Function Tests / Q000662:veterinary; D018497:Ventricular Dysfunction, Right / Q000503:physiopathology* / Q000662:veterinary; D016278:Ventricular Function, Right / Q000502:physiology*