Electrocardiographic characteristics of trained and untrained standardbred racehorses
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Electrocardiographic characteristics of trained and untrained standardbred racehorses. / Nissen, Sarah D.; Weis, Rikke; Krag-Andersen, Elisabeth K.; Hesselkilde, Eva M.; Isaksen, Jonas L.; Carstensen, Helena; Kanters, Jørgen K.; Linz, Dominik; Sanders, Prashanthan; Hopster-Iversen, Charlotte; Jespersen, Thomas; Pehrson, Steen; Buhl, Rikke.
In: Journal of Veterinary Internal Medicine, Vol. 36, No. 3, 2022, p. 1119-1130.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Electrocardiographic characteristics of trained and untrained standardbred racehorses
AU - Nissen, Sarah D.
AU - Weis, Rikke
AU - Krag-Andersen, Elisabeth K.
AU - Hesselkilde, Eva M.
AU - Isaksen, Jonas L.
AU - Carstensen, Helena
AU - Kanters, Jørgen K.
AU - Linz, Dominik
AU - Sanders, Prashanthan
AU - Hopster-Iversen, Charlotte
AU - Jespersen, Thomas
AU - Pehrson, Steen
AU - Buhl, Rikke
N1 - Publisher Copyright: © 2022 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals LLC on behalf of American College of Veterinary Internal Medicine.
PY - 2022
Y1 - 2022
N2 - Background: Long-term exercise induces cardiac remodeling that potentially influences the electrical properties of the heart. Hypothesis/objectives: We assessed whether training alters cardiac conduction in Standardbred racehorses. Animals: Two hundred one trained and 52 untrained Standardbred horses. Methods: Cross-sectional study. Resting ECG recordings were analyzed to assess heart rate (HR) along with standard ECG parameters and for identification of atrial and ventricular arrhythmias. An electrophysiological study was performed in 13 horses assessing the effect of training on sinoatrial (SA) and atrioventricular (AV) nodal function by sinus node recovery time (SNRT) and His signal recordings. Age and sex adjustments were implemented in multiple and logistic regression models for comparison. Results: Resting HR in beats per minute (bpm) was lower in trained vs untrained horses (mean, 30.8 ± 2.6 bpm vs 32.9 ± 4.2 bpm; P =.001). Trained horses more often displayed second-degree atrioventricular block (2AVB; odds ratio, 2.59; P =.04). No difference in SNRT was found between groups (n = 13). Mean P-A, A-H, and H-V intervals were 71 ± 20, 209 ± 41, and 134 ± 41 ms, respectively (n = 7). We did not detect a training effect on AV-nodal conduction intervals. His signals were present in 1 horse during 2AVB with varying H-V interval preceding a blocked beat. Conclusions and Clinical Importance: We identified decreased HR and increased frequency of 2AVB in trained horses. In 5 of 7 horses, His signal recordings had variable H-V intervals within each individual horse, providing novel insight into AV conduction in horses.
AB - Background: Long-term exercise induces cardiac remodeling that potentially influences the electrical properties of the heart. Hypothesis/objectives: We assessed whether training alters cardiac conduction in Standardbred racehorses. Animals: Two hundred one trained and 52 untrained Standardbred horses. Methods: Cross-sectional study. Resting ECG recordings were analyzed to assess heart rate (HR) along with standard ECG parameters and for identification of atrial and ventricular arrhythmias. An electrophysiological study was performed in 13 horses assessing the effect of training on sinoatrial (SA) and atrioventricular (AV) nodal function by sinus node recovery time (SNRT) and His signal recordings. Age and sex adjustments were implemented in multiple and logistic regression models for comparison. Results: Resting HR in beats per minute (bpm) was lower in trained vs untrained horses (mean, 30.8 ± 2.6 bpm vs 32.9 ± 4.2 bpm; P =.001). Trained horses more often displayed second-degree atrioventricular block (2AVB; odds ratio, 2.59; P =.04). No difference in SNRT was found between groups (n = 13). Mean P-A, A-H, and H-V intervals were 71 ± 20, 209 ± 41, and 134 ± 41 ms, respectively (n = 7). We did not detect a training effect on AV-nodal conduction intervals. His signals were present in 1 horse during 2AVB with varying H-V interval preceding a blocked beat. Conclusions and Clinical Importance: We identified decreased HR and increased frequency of 2AVB in trained horses. In 5 of 7 horses, His signal recordings had variable H-V intervals within each individual horse, providing novel insight into AV conduction in horses.
KW - athlete's heart
KW - atrioventricular conduction
KW - cardiac arrhythmia
KW - equine
KW - His signal
KW - sinus node recovery time
KW - specialized conduction system
UR - http://www.scopus.com/inward/record.url?scp=85129198700&partnerID=8YFLogxK
U2 - 10.1111/jvim.16427
DO - 10.1111/jvim.16427
M3 - Journal article
C2 - 35488721
AN - SCOPUS:85129198700
VL - 36
SP - 1119
EP - 1130
JO - Journal of Veterinary Internal Medicine
JF - Journal of Veterinary Internal Medicine
SN - 0891-6640
IS - 3
ER -
ID: 306452699