Changes in Heart Rate Variability with Induction of Gastric Ulcers in Adult Horses

Louie, Elizabeth Williams; Berryhill, Emily H.; Nieto, Jorge E.; Wensley, Fiona; Knych, Heather K.; Finno, Carrie Jf; Morgan, Joe P.

doi:10.1016/j.jevs.2022.104192

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…The balance of sympathetic and parasympathetic activity can be analyzed by variability in heart rate or HRV for assessing stress and different welfare states in farm animals [16]. In addition, HR variability (HRV) is useful for diagnosing arrhythmias in sports horses [17,18] and was widely used in horses [19][20][21][22]. Vasovagal tonus index or VVTI (time domain analyses of HRV) is a simple method of assessing sympathetic and parasympathetic tone balance in horses [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of pregnancy on electrocardiographic, vasovagal tonus index, and echocardiographic variables in horses

Chompoosan,

Pongthaisong,

Kenchaiwong

et al. 2023

Vet World

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Background and Aim: Pregnancy affects maternal hemodynamics. The changes in autonomic nervous system activity for hemodynamics adaptation in pregnant horses are still unclear. Thus, this study aimed to examine the effect of pregnancy on electrocardiographic, vasovagal tonus index, and echocardiographic variables in horses. Materials and Methods: A total of 23 Thai native crossbred mares without any cardiac abnormalities were included in this study. The animals were assigned into two groups, a non-pregnant mare group (n =12) and a pregnant mare group (n = 11). Electrocardiogram recordings (paper speed = 25 mm/s and calibration = 10 mm/mV) were performed to obtain six limb leads (leads I, II, III, aVR, aVL, and aVF). The vasovagal tonus index (VVTI) was calculated to assess variability in heart rate over short periods using just 20 consecutive beats. Cardiac structure and function were evaluated by echocardiography. Results: Heart rate, P wave duration, PR interval, QRS duration, QT interval, and T wave duration were significantly different between non-pregnant and pregnant horses (p < 0.05). Pregnant horses had significantly lower VVTI than non-pregnant (p < 0.05). There were no significant differences in cardiac structures including % interventricular septum (IVS), % left ventricular posterior wall (LVPW), IVS in diastole, left ventricular internal diameter at end-diastole, LVPW thickness at end-diastole, IVS in systole, left ventricular internal diameter at end-systole, LVPW thickness at end-systole, and left atrium/aortic roots ratio between the two groups. However, the pregnant horses had a significantly higher cardiac output and % ejection fraction than non-pregnant horses (p < 0.05). Conclusion: This study provided the first evidence that hemodynamic adaptations during pregnancy modified cardiac conduction, vasovagal tonus index, and echocardiographic variables in horses. Keywords: echocardiography, electrocardiogram, horses, pregnancy, vasovagal tonus index.

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Section: Introductionmentioning

confidence: 99%

Effects of pregnancy on electrocardiographic, vasovagal tonus index, and echocardiographic variables in horses

Chompoosan,

Pongthaisong,

Kenchaiwong

et al. 2023

Vet World

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Parasympathetic tone activity, heart rate, and grimace scale in conscious horses of 3 breeds before, during, and after nociceptive mechanical stimulation

Flores,

Terrazas,

Lara Sagahon

et al. 2024

Veterinary Internal Medicne

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BackgroundParasympathetic tone activity (PTA) in response to nociceptive stimulus in conscious non‐sedated horses is unknown.ObjectivesStudy PTA, heart rate (HR), and horse grimace scale (HGS) at rest and during mechanical nociceptive stimulation.AnimalsNinety healthy young adult horses (females, males): 30 each of Friesians, Quarter Horses, and Warmbloods.MethodsProspective control study. The study consisted of habituation to equipment (Day 1), baseline recordings (Days 2 and 3), and nociceptive testing applying mild pressure to the metacarpus (Day 4). Parasympathetic tone, HR, and HGS were recorded simultaneously on Days 2 to 4. Each study lasted 30 minutes and was done in triplicate at 3 different time points per day.ResultsBaseline PTA was not different among breeds. It decreased in Warmbloods and Quarter Horses during placement of the stimulus device without stimulation (P < .01). A significant decrease in PTA (P < .001) occurred during nociceptive stimulus (marked in Quarter Horses, intermediate in Warmbloods, and mild in Friesians). Heart rate and HGS increased significantly (P < .001) during the stimulus in all breeds but returned to baseline poststimulation. Friesians required higher pressure (P < .05) to elicit an aversive response to the stimulus.ConclusionsHorses' PTA, HR, and HGS change in response to a mild mechanical nociceptive stimulus with Friesians showing less variation. Stress induced a decrease in PTA in Quarter Horses and Warmbloods but not in Friesians. Friesians appeared to be more tolerant to pain based on PTA, HR, and HGS findings compared with other breeds.

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Changes in Heart Rate Variability with Induction of Gastric Ulcers in Adult Horses

Cited by 2 publications

References 33 publications

Effects of pregnancy on electrocardiographic, vasovagal tonus index, and echocardiographic variables in horses

Effects of pregnancy on electrocardiographic, vasovagal tonus index, and echocardiographic variables in horses

Parasympathetic tone activity, heart rate, and grimace scale in conscious horses of 3 breeds before, during, and after nociceptive mechanical stimulation

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