Peer-reviewed veterinary case report
Genetic factors linked to heart rhythm problems in young German
By Cruickshank, J et al.·Published in Journal of veterinary internal medicine·2009·Department of Biomedical Sciences, United States·View original on PubMed →
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Original publication title: Genetic analysis of ventricular arrhythmia in young German Shepherd Dogs.
- Species:
- dog
Plain-English summary
A study found that young German Shepherd Dogs (GSDs) can inherit a serious heart condition called ventricular arrhythmia, which can lead to sudden death. Researchers monitored 398 GSDs using a 24-hour ECG to track heart irregularities, including single premature ventricular complexes (PVCs) and more severe forms like ventricular tachycardia (VT). The findings suggest that these heart issues have a strong genetic basis, with certain traits appearing at different ages. If you have a GSD, it's important to be aware of these potential heart problems and discuss any concerns with your veterinarian.
People also search for: German Shepherd heart problems · puppy ventricular arrhythmia · inherited heart disease in dogs
Abstract
BACKGROUND: Ventricular arrhythmias (VA) and sudden death are inherited in German Shepherd Dogs (GSDs). OBJECTIVES: To estimate the genetic parameters (heritabilities and correlations) of 3 traits of VA (single premature ventricular complexes (PVCs), 2 consecutive PVCs (couplets), and 3 or more consecutive PVCs-ventricular tachycardia [VT]). ANIMALS: Three hundred and ninety-eight GSDs. METHODS: Prospective, observational, case control study. Dogs were phenotyped by 24-hour ambulatory ECG from 6 to 45 weeks of age. Edited ECG records included the number of incidents of (1) single PVCs, (2) couplets, and (3) VT. RESULTS: A data set of 1,239 Holter records from 398 GSDs was used to estimate genetic variables. Phenotypic correlations for affectedness (binarily coded 0/1) of the 3 traits ranged from 0.55 to 0.74, whereas correlations for severity (continuous values of 24-hour VA counts) ranged from 0.26 to 0.39. Estimates of genetic correlation among the severity traits were 0.06 to 0.27. Estimated heritabilities were 0.54, 0.54, and 0.46 for affectedness and 0.33, 0.69, and 0.69 for severity of PVCs, couplets, and VT, respectively. Month and year of birth and age at ECG recording had significant effects on all 3 traits. Season of ECG recording had a significant effect on the number of single PVCs, but not couplets or incidents of VT. Age of onset differed, with single PVCs appearing an average of 4 days earlier than couplets and VT. CONCLUSION: These results imply a strong genetic component for this disease but suggest that differences in the 3 traits should be taken into consideration in studies to identify the underlying genes.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/19210315/