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A dog presenting with syncope due to two different etiologies
Mizuki Ogawa1, Hirosumi Miyakawa1, Huai-Hsun Hsu1
1Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino-Shi, Japan.
Journal of Advanced Veterinary and Animal Research
|November 16, 2022
Summary
Syncope in dogs can have multiple causes. This case highlights pulmonary hypertension from heartworm disease, followed by sick sinus syndrome, emphasizing the need to consider arrhythmias in dogs with heart conditions.
Area of Science:
- Veterinary Cardiology
- Canine Internal Medicine
Background:
- Syncope (fainting) in dogs necessitates accurate etiological diagnosis for effective treatment.
- Pulmonary hypertension (PH) can be a significant underlying condition in canine syncope cases.
Observation:
- An 8-year-old English Cocker Spaniel presented with syncope attributed to heartworm disease and associated PH.
- Initial treatment with pimobendan resolved syncope, but it recurred approximately 7 months later.
Findings:
- Recurrent syncope was linked to sinus arrest, leading to a diagnosis of sick sinus syndrome (Rubenstein classification type II).
- Administration of cilostazol successfully resolved the recurrent syncope.
Implications:
- This case underscores the importance of considering diverse etiologies for syncope in dogs, including both primary cardiac and secondary arrhythmic events.
- In dogs with pulmonary hypertension, a thorough cardiac evaluation for potential arrhythmias, such as sick sinus syndrome, is crucial for comprehensive management.
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