Electrocardiographic characteristics of trained and untrained standardbred racehorses

Journal of Veterinary Internal Medicine

Prashanthan Sanders¹  Steen Pehrson²  Rikke Buhl³  Helena Carstensen³  Elisabeth K. Krag‐Andersen³  Rikke Weis³  Charlotte Hopster‐Iversen³  Dominik Linz⁴  Thomas Jespersen⁴  Sarah D. Nissen⁴  Eva M. Hesselkilde⁴  Jonas L. Isaksen⁵  Jørgen K. Kanters⁵ 

[1] Centre for Heart Rhythm Disorders University of Adelaide and Royal Adelaide Hospital Adelaide South Australia Australia;Department of Cardiology 2142 The Heart Centre, Copenhagen University Hospital Rigshospitalet Denmark;Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences University of Copenhagen Taastrup Denmark;Laboratory of Cardiac Physiology, Department of Biomedical Sciences, Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark;Laboratory of Experimental Cardiology, Department of Biomedical Sciences University of Copenhagen Copenhagen Denmark;

关键词: athlete's heart;    atrioventricular conduction;    cardiac arrhythmia;    equine;    His signal;    sinus node recovery time;   

DOI  :  10.1111/jvim.16427

来源: DOAJ

【 摘 要 】

Abstract 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.

【 授权许可】

Unknown