Influence of Obesity on Histological Tissue Structure of the Cardiovascular System in Horses.
Authors: Siwinska Natalia, Janus Izabela, Zak-Bochenek Agnieszka, Noszczyk-Nowak Agnieszka
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary: Obesity and Cardiovascular Tissue Changes in Horses Whilst obesity's metabolic consequences in horses are well documented, its direct effects on cardiovascular tissue architecture remain poorly understood compared to human medicine, motivating this histopathological investigation. Researchers examined heart and arterial tissue samples from 12 severely obese draft horses (body condition score 9/9) and 7 lean controls (BCS 4–5/9), analysing myocardial structure alongside aortic, pulmonary, coronary and palmar arterial specimens. Obese horses demonstrated marked architectural disruption and vacuolisation within the aortic tissue, whilst the intima layer was significantly thickened in the pulmonary arteries, coronary arteries and palmar arteries of the obese group compared to controls; notably, palmar arteries in obese horses exhibited both enlarged luminal diameter and a higher lumen-to-total diameter ratio. These findings indicate that obesity drives substantive remodelling of both central and peripheral vascular tissue in addition to myocardial changes, raising important questions about exercise tolerance, arterial compliance and long-term cardiovascular function in overweight horses. Given the prevalence of obesity in leisure and companion horses, these tissue-level insights warrant serious consideration of body weight management protocols and may inform monitoring strategies for cardiovascular health in at-risk populations.
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Practical Takeaways
- •Obese horses develop significant cardiovascular pathology including myocardial and arterial tissue changes, which may compromise exercise tolerance and increase disease risk — body condition management is critical for cardiovascular health
- •Peripheral arterial changes in obese horses could affect blood flow and may have implications for lameness, healing, and thermoregulation — weight management should be prioritized alongside other interventions
- •These histological findings support aggressive obesity prevention and management protocols in draft and leisure horses to prevent irreversible cardiovascular damage
Key Findings
- •Obese horses (BCS 9/9, n=12) showed significantly more intense myocardial architectural disturbances and aortic vacuolization compared to normal BCS horses (4-5/9, n=7)
- •Intimal thickness was greater in pulmonary, coronary, and palmar arteries of obese horses versus healthy controls
- •Palmar arteries in obese horses demonstrated larger lumen diameter and increased lumen-to-total diameter ratio relative to control group
- •Obesity in horses produces structural and functional cardiovascular changes analogous to those documented in obese humans