Observations on the T Wave of the Equine Electrocardiogram

Holmes, J. R.; Rezakhani, A

doi:10.1111/j.2042-3306.1975.tb03230.x

Cited by 34 publications

(13 citation statements)

References 23 publications

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“…Entretanto, neste estudo, o aumento discreto da onda T no MF (Tabela 1) foi tido como fisiológico, segundo HOLMES & REZAKHANI (1975), PICCIONE, et al (2003) e DOJANA et al (2008 em resposta ao exercício, devido à redução do aporte sanguíneo pelas coronárias durante a diástole em frequências cardíacas elevadas. Em M0, essa onda foi bifásica (-+) (Figura 4), em 68% dos animais, e monofásica positiva (+), em 32%, e em MF foi monofásica positiva (+) em 55% e bifásica (-+) em 45%.…”

Section: Resultsunclassified

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

et al. 2010

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Section: Resultsunclassified

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

et al. 2010

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“…It seems likely that the repolarisation process in the ventricular myocardium may be affected by the duration of diastole and other factors (training, fear, vagal activity, etc. ), which affect the length of the diastole including the effects of the autonomic nervous system and metabolic effects on the myocardial fibres influenced by coronary flow [14].…”

Section: Discussionmentioning

confidence: 99%

Morphology and amplitude values of the electrocardiogram of Spanish-bred horses of different ages in the Dubois leads system

et al. 2000

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-The aim of this work was to record the modifications of the form and amplitude of the electrocardiographic tracings during growth using the Dubois system and to study its sensibility to these physiological changes. This work was carried out on 179 healthy, young and adult Spanish-bred horses (98 females and 81 males). One electrocardiogram (ECG) was obtained from each horse using the Dubois leads system. The bifid shape deflection of the P wave was generally more frequent than the simple one in animals at 4 months of age or older. Amplitudes of the P 2 component and of the simple positive wave presented significant differences (p < 0.01) between the age groups studied: animals up to 3 months in age and older than 2 years of age (highest amplitudes), and the rest of the animals (lowest amplitudes). Significant variations (p < 0.05) were found for the QS amplitude between animals of 1 month of age, and all the other groups. The multiple range analysis did not define a clear distribution of age groups for the amplitude of the T wave. It may therefore be concluded, that in the Spanish-bred horse up to 1 month of age, the form and amplitude of the QRS complex in the Dubois leads system differ from those of older animals. Thus, this study shows the sensibility of the Dubois leads system for detecting the electrocardiographic changes related to the growing process in the Spanish-bred horse. In addition, it provides standard values of electrocardiographic parameters in the Spanish-bred horse at different stages of growth. Dubois leads / electrocardiogram / horse / Spanish-bredVet.

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“…Electrocardiography is often considered in the diagnosis of the cause of poor performance. Morphologic characteristics in the electrocardiographic T wave have been related to lack of performance in apparently healthy horses [15]. Other studies have attempted to correlate the number of sporting events won by the horse with the value of "Heart Score", a presumed index of the ventricular size, calculated from the mean duration of QRS complex on the three Leads of Einthoven (I, II, III) [27].…”

Section: Standardized Exercise Test (Set)mentioning

confidence: 99%

The Use of Functional Indexes to Evaluate Fitness in Andalusian Horses.

et al. 1997

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ABSTRACT. The fitness of 8 Andalusian horses between 3 and 4 years of age was analysed. The animals were subjected to an exercise test on a sandy track consisting of 2 stages of different intensities. The first stage was of submaximal intensity at 4 speeds which increased progressively (4.17, 5.56, 6.94 and 8.33 m/sec.) covering a distance of 1,000 m in each level. Between each of these speeds, the horses rested for 2 min. The second stage was a maximal speed test over the same distance carried out 2 min after the ending of the maximal phase. Data of heart rate, plasma lactate concentration, velocity, PCV and pH in the blood were obtained. Maximum heart rate, maximum velocity, V LA2 , V LA4 , peak lactate, minimum pH and maximum PCV were considered functional indexes. A principal component enabled us to segregate horses according to their fitness and in relation to the information provided by the trainers in charge of these horses. The most discriminant variables in order to segregate horses were pHmin, V LA4 , HRmax, V LA2 and Vmax. Differences between horses in relation to PCVmax were not found. The influence of each one of these functional indexes on the test exercise tolerance was discussed. -KEY WORDS: equine exercise, fitness, functional index.

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Observations on the T Wave of the Equine Electrocardiogram

Cited by 34 publications

References 23 publications

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

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

Morphology and amplitude values of the electrocardiogram of Spanish-bred horses of different ages in the Dubois leads system

The Use of Functional Indexes to Evaluate Fitness in Andalusian Horses.

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