Cardiac arrhythmias during and after treadmill exercise in poorly performing Thoroughbred racehorses

Jose‐Cunilleras, Eduard; Young, Lesley; Newton, J. R.; Marlin, D. J.

doi:10.1111/j.2042-3306.2006.tb05534.x

Cited by 51 publications

(58 citation statements)

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“…Both supraventricular and ventricular premature beats have raised concerns in equine cardiology as potential initiators of atrial fibrillation [2] and fatal ventricular arrhythmias [3]. In recent years, studies have therefore investigated the occurrence of premature beats in healthy horses [4–8], horses with poor performance [9, 10], and in both clinical [11, 12] and experimental settings [13]. These studies provide valuable information on the prevalence of premature beats, although a comparison of the results is problematic due to different study designs.…”

Section: Introductionmentioning

confidence: 99%

Appropriate threshold levels of cardiac beat-to-beat variation in semi-automatic analysis of equine ECG recordings

et al. 2016

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BackgroundAlthough premature beats are a matter of concern in horses, the interpretation of equine ECG recordings is complicated by a lack of standardized analysis criteria and a limited knowledge of the normal beat-to-beat variation of equine cardiac rhythm. The purpose of this study was to determine the appropriate threshold levels of maximum acceptable deviation of RR intervals in equine ECG analysis, and to evaluate a novel two-step timing algorithm by quantifying the frequency of arrhythmias in a cohort of healthy adult endurance horses.ResultsBeat-to-beat variation differed considerably with heart rate (HR), and an adaptable model consisting of three different HR ranges with separate threshold levels of maximum acceptable RR deviation was consequently defined. For resting HRs <60 beats/min (bpm) the threshold level of RR deviation was set at 20%, for HRs in the intermediate range between 60 and 100 bpm the threshold was 10%, and for exercising HRs >100 bpm, the threshold level was 4%. Supraventricular premature beats represented the most prevalent arrhythmia category with varying frequencies in seven horses at rest (median 7, range 2–86) and six horses during exercise (median 2, range 1–24).ConclusionsBeat-to-beat variation of equine cardiac rhythm varies according to HR, and threshold levels in equine ECG analysis should be adjusted accordingly. Standardization of the analysis criteria will enable comparisons of studies and follow-up examinations of patients. A small number of supraventricular premature beats appears to be a normal finding in endurance horses. Further studies are required to validate the findings and determine the clinical significance of premature beats in horses.

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Section: Introductionmentioning

confidence: 99%

Appropriate threshold levels of cardiac beat-to-beat variation in semi-automatic analysis of equine ECG recordings

et al. 2016

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“…Nesse contexto, a eletrocardiografia tenta quantificar o treinamento e o desempenho atlético, por meio da determinação do escore cardíaco, além de estimar a massa cardíaca (MUÑOZ et al, 1995;YOUNG, 2003;LIGHTOWLER et al, 2004;ANDRADE et al, 2006;JOSE-CUNILLERAS et al, 2006;DINIZ et al, 2008;DOJANA et al, 2008). Desde que associado a exame cardiovascular criterioso, o eletrocardiograma (ECG) auxilia no diagnóstico de distúrbios de formação e condução do impulso elétrico por meio do coração e na avaliação da evolução de doenças cardíacas (WHITE II & RHODE, 1974 …”

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Parâmetros eletrocardiográficos de equinos Puro Sangue Árabe submetidos a exercício prolongado de enduro

et al. 2010

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“…Several previous studies on racehorses found no negative association with performance despite the high prevalence of valvular regurgitation (Young et al 2008;Richard et al 2010). Nevertheless, normal cardiac structure and function at rest may not exclude the possibility of abnormalities induced by strenuous exercise (Martin et al 2000;Jose-Cunilleras et al 2006). Exercise-induced myocardial dysfunction can be detected by echocardiography immediately after exercise, but this was not performed in the present study.…”

Section: Discussionmentioning

confidence: 54%

Evaluation of poor performance in racehorses using a high-speed treadmill

Melkova¹,

Jahn²,

Bodeček³

et al. 2016

Vet. Med. - Czech

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ABSTRACT:The study reports the results of a comprehensive clinical evaluation of 18 racehorses with a history of inadequate athletic performance. The poor performance evaluation included general physical examination and laboratory screening, respiratory examination including upper airway endoscopy at rest and during maximal treadmill exercise, cardiac examination, post-exercise serum biochemistry and bronchoalveolar lavage cytology. A definitive diagnosis was established in 15 horses (83.3%). The most frequent findings were upper respiratory tract disorders, with dorsal displacement of the soft palate being most often diagnosed (eight horses) followed by axial deviation of the aryepiglottic folds (two horses) and recurrent laryngeal neuropathy (two horses). Inflammatory airway disease was diagnosed in two horses and exercise-induced pulmonary haemorrhage in one horse. Subclinical myopathy was detected in two horses. Ten horses (55.6%) had multiple concomitant problems that may have contributed to their inadequate athletic performance; therefore, a comprehensive approach is required to diagnose the cause of decreased athletic capability.Keywords: exercise testing; upper airway obstruction; endoscopy; horse List of abbreviations ADAF = axial deviation of aryepiglottic fold, BAL = bronchoalveolar lavage, CK = creatine kinase, EIPH = exerciseinduced pulmonary haemorrhage, IAD = inflammatory airway disease, PLH = pharyngeal lymphoid hyperplasia, RLN = recurrent laryngeal neuropathy, SET = standardised exercise test

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Cardiac arrhythmias during and after treadmill exercise in poorly performing Thoroughbred racehorses

Abstract: The guidelines for interpretation and clinical relevance of premature depolarisations observed during and immediately after treadmill exercise tests in poor performing Thoroughbred racehorses deserves further evaluation.

Cited by 51 publications

References 14 publications

Appropriate threshold levels of cardiac beat-to-beat variation in semi-automatic analysis of equine ECG recordings

Appropriate threshold levels of cardiac beat-to-beat variation in semi-automatic analysis of equine ECG recordings

Parâmetros eletrocardiográficos de equinos Puro Sangue Árabe submetidos a exercício prolongado de enduro

Evaluation of poor performance in racehorses using a high-speed treadmill

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