Relationship of heart rate and electrocardiographic time intervals to body mass in horses and ponies

Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology
Colin C SchwarzwaldRobert L Hamlin

Abstract

To investigate the relationship of heart rate (HR) and ECG time intervals to body weight (BWT) in healthy horses and ponies. We hypothesized that HR and ECG time intervals are related to BWT. 250 healthy horses of >30 breeds; 5.5 (1-30) y [median (range)]; 479 (46-1018) kg. Prospective study. Standard base-apex ECGs were recorded while the horses were standing quietly in a box stall. Mean HR over 15 s was calculated and RR interval, PQ interval, QRS duration, and QT interval were measured by a single observer.QT was corrected for differences in heart rate using Fridericia's formula (QT(cf) = QT/(3)√RR). The relationship between ECG variables and BWT, age, sex, and RR interval was assessed using multivariate backward stepwise regression analyses. Goodness of fit of the model was improved when using log(BWT) compared to BWT. Body weight was overall the strongest predictor of HR and ECG time intervals. Therefore, only log(BWT) was included as an independent variable in the final model. The level of significance was p = 0.05. HR (R(2) = 0.21) showed a significant negative relationship and PQ (R(2) = 0.53), QRS (R(2) = 0.23), QT (R(2) = 0.14), and QT(cf) (R(2) = 0.02) showed significant positive relationships to log(BWT). Small equi...Continue Reading

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Citations

Apr 2, 2016·Journal of Electrocardiology·Jay W MasonIain Strachan
Apr 14, 2016·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·P J PedersenR Buhl
Oct 4, 2014·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·Philip J PedersenDan A Klaerke
Jun 28, 2013·Asian Pacific Journal of Cancer Prevention : APJCP·Zahra BahadoranBahram Rashidkhani
Jul 9, 2020·Journal of Veterinary Internal Medicine·Ignacio CorradiniJavier Engel-Manchado
Jul 1, 2021·Journal of Animal Science and Technology·Kyung Eun LeeByung Sun Kim
Aug 8, 2021·Animals : an Open Access Journal From MDPI·Laura B HunterKevin J Stafford

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