Increased dispersion of ventricular repolarization during recovery from exercise

Draisma, Harmen H.M.; Huysduynen, Bart Hooft van; Swenne, Cees A.; Maan, Arie C.; Wall, Ernst E. van der; Schalij, Martin J.

doi:10.1109/cic.2005.1588040

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…This may be different for the ventricular gradient. In a previous study we have demonstrated, in exercise ECGs, that the ventricular gradient during the exercise phase differs from the ventricular gradient during the recovery phase, when measured at equal heart rates [18]. This is due to the differences in circulating catecholamines and sympathetic and parasympathetic tone measured in these different physiological situations, similar differences may also occur during routine ECG recordings when patients are not given ample time to accommodate to a complete resting state.…”

Section: Independent Variablementioning

confidence: 82%

Intra-individual ECG changes over 25 years: How long can elective ECGs be used as reference for acute ischemia detection?

Jongh

Haar

Man

et al. 2015

Journal of Electrocardiology

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Section: Independent Variablementioning

confidence: 82%

Intra-individual ECG changes over 25 years: How long can elective ECGs be used as reference for acute ischemia detection?

Jongh

Haar

Man

et al. 2015

Journal of Electrocardiology

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“…Franz et al [ 22 ] showed that the transient from a steady-state APD at a given stimulation cycle length (CL) towards a new steady-state APD after a step change in stimulation CL takes several minutes, or several hundreds of beats. More dynamic CL changes (e.g., a gradual decrease followed by a gradual increase) that are too fast for steady-state APD adaptation can cause hysteresis in the APD–CL relationship [ 23 , 24 ] and, consequently, in the ECG (e.g., during the exercise and recovery phase of an exercise test [ 25 ]).…”

Section: Introductionmentioning

confidence: 99%

Intra-Individual Comparison of Sinus and Ectopic Beats Probing the Ventricular Gradient’s Activation Dependence

Schoonderwoerd

Dik

Man

et al. 2023

JCDD

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Wilson assumed that the ventricular gradient (VG) is independent of the ventricular activation order. This paradigm has often been refuted and was never convincingly corroborated. We sought to validate Wilson’s concept by intra-individual comparison of the VG of sinus beats and ectopic beats, thus assessing the effects of both altered ventricular conduction (caused by the ectopic focus) and restitution (caused by ectopic prematurity). We studied standard diagnostic ECGs of 118 patients with accidental extrasystoles: normally conducted supraventricular ectopic beats (SN, N = 6) and aberrantly conducted supraventricular ectopic beats (SA, N = 20) or ventricular ectopic beats (V, N = 92). In each patient, we computed the VG vectors of the predominant beat, VGp→, of the ectopic beat, VGe→, and of the VG difference vector, ΔVGep→, and compared their sizes. VGe→ of the SA and V ectopic beats were significantly larger than VGp→ (53.7 ± 25.0 vs. 47.8 ± 24.6 mV∙ms, respectively; p < 0.001). ΔVGep→ were three times larger than the difference of VGe→ and VGp→ (19.94 ± 9.76 vs. 5.94 mV∙ms, respectively), demonstrating differences in the VGp→ and VGe→ spatial directions. The amount of ectopic prematurity was not correlated with ΔVGep→, although the larger VG difference vectors were observed for the more premature (<80%) extrasystoles. Electrical restitution properties and electrotonic interactions likely explain our findings. We conclude that the concept of a conduction-independent VG should be tested at equal heart rates and without including premature extrasystoles.

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Postexercise recovery of the spatial QRS/T angle as a predictor of sudden cardiac death

et al. 2012

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Increased dispersion of ventricular repolarization during recovery from exercise

Abstract: Abstract

Cited by 5 publications

References 15 publications

Intra-individual ECG changes over 25 years: How long can elective ECGs be used as reference for acute ischemia detection?

Intra-individual ECG changes over 25 years: How long can elective ECGs be used as reference for acute ischemia detection?

Intra-Individual Comparison of Sinus and Ectopic Beats Probing the Ventricular Gradient’s Activation Dependence

Postexercise recovery of the spatial QRS/T angle as a predictor of sudden cardiac death

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