Reversible Dynamic Left Ventricular Outflow Tract Obstruction in Two Young Dogs Managedwith ββ 1 -Blockers
10.17555/jvc.2025.42.2.102
- Author:
Hyung-Kyu CHAE
1
;
Han-Sol CHOI
;
Won-Kyoung YOON
Author Information
1. Department of Veterinary Clinical Nutrition, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea
- Publication Type:Case Report
- From:
Journal of Veterinary Clinics
2025;42(2):102-107
- CountryRepublic of Korea
- Language:English
-
Abstract:
Dynamic left ventricular outflow tract obstruction (DLVOTO) is commonly observed in feline patients with hypertrophic cardiomyopathy, but it is less frequent in dogs. DLVOTO observed in young dogs often resolves after β 1 -adrenergic antagonist treatment. However, due to the lack of reported cases and the absence of a control group, it is difficult to determine whether improvements are due to aging-related changes in ventricular architecture or treatment itself. Thus, we report two cases of DLVOTO confirmed via echocardiography.Case 1 was an 8-month-old female Spitz and Case 2 was a 5-month-old female Cocker Spaniel. A prophylactic β 1 -adrenergic antagonist was prescribed to reduce the outflow gradient, and echocardiographic changes associated with DLVOTO and consequent left ventricular concentric hypertrophy resolved after β 1 -blocker prescription. This is the first report to discuss echocardiographic changes in relation to changes in β-blocker dose in canine DLVOTO
