Asymmetry of the Variability of Heart Rate and Conduction Time Between Atria and Ventricles

Guzik, Przemysław; Zuchowski, Bartosz; Błaszyk, Krzysztof; Seniuk, Wojciech; Waśniewski, Michał; Gwizdała, Adrian; Wykretowicz, Andrzej; Piskorski, Jarosław

doi:10.1253/circj.cj-13-0461

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…The exact causal mechanisms of heart rate asymmetry are unknown, but it is assumed be regulated by similar factor as HRV. These factors include the baroreceptor reflex and respiratory sinus rhythm modulations, but heart rate asymmetry has furthermore been linked to asymmetry in the myocardial conduction time between the atria and ventricles [29]. It remains unclear how heart rate asymmetry is modulated in horses.…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…Another important conclusion is that SV, CO and SVR combined with previous findings with RR intervals, AH intervals, HV intervals and systolic blood pressure [1][2][3][4][5][6][7][8][9][10] show that the asymmetry of the variability of cardiovascular time series is a general phenomenon. However, we are aware that for the asymmetry of haemodynamic variability to have clinical value further investigations are required.…”

Section: Discussionmentioning

confidence: 56%

“…asymmetrical properties of atrioventricular conduction or baroreflex control of the cardiovascular system, the exact mechanisms responsible for our findings are yet unresolved [8,[11][12].…”

Section: Discussionmentioning

confidence: 84%

“…The variability and asymmetrical properties of the variability of SV, CO and SVR was quantified according to the methods described previously [1][2][3][4][5][6][7][8][9][10] with the in-house software written in Python (Python Foundation, USA). These methods were originally developed to describe and quantify heart rate asymmetry, and they were verified with shuffled data to exclude effects of mathematical algorithms over genuine physiological phenomenon [1][2][3].…”

Section: Asymmetry Of the Haemodynamic Variabilitymentioning

confidence: 99%

“…With these methods we discovered a series of new physiological phenomena. The first asymmetrical phenomenon was heart rate asymmetry [1][2][3][4][5], another one was systolic blood pressure asymmetry [7] and very recently we have described the phenomenon of atrioventricular conduction asymmetry [8].…”

Section: Introductionmentioning

confidence: 99%

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