Silent zone on Lorenz plots of the ventricular response before termination of paroxysmal atrial fibrillation: Report of a case.

Nakatsu, Takaaki; Kusachi, Shozo; Honma, Nana; Nunoyama, Hiroshi; Moritani, Hiroki

doi:10.1253/jcj.58.676

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Confirming prior findings, 16,19–21 we consistently observed widely scattered data points in the Lorenz plots of patients with sustained atrial fibrillation. All such LPs had a triangular, fan ‐like shape (Fig.…”

Section: Discussionsupporting

confidence: 89%

“…6) were associated with an SZ‐Fan pattern (Fig. 5B) may offer an explanation for the occurrence of multimodal interval distributions observed by us and others 16 in a subset of patients with chronic AF. It is tempting to speculate that the alternans phenomenon we observed is an expression of the presence of multiple A‐V nodal pathways in a specific subgroup of AF patients.…”

Section: Discussionsupporting

confidence: 57%

“…Among the 1296 fan patterns 712 (55%) showed a homogeneous appearance ( H‐Fan , Fig. 5A), while 584 (45%) exhibited a silent zone phenomenon (i.e., a well‐demarcated region only sparsely filled with data points or completely devoid of any data points) 16 located in the middle and/or at the distal edges of the fan ( SZ‐Fan ,Fig. 5B).…”

Section: Resultsmentioning

confidence: 99%

“…Except for inappropriate sinus tachycardia, 18 atrial fibrillation, 16,19–21 ectopic atrial tachycardia 18 and ventricular premature depolarizations, 21,22 so far no systematic results have been available regarding manifestations of cardiac tachyarrhythmias in the Lorenz plots. The results of this study bridge this gap and set up a foundation for theoretical predictions regarding the imprinting effects on two‐dimensional Lorenz plots that arise from clinically relevant dysrhythmias, such as frequent atrial and ventricular ectopy, atrial fibrillation, atrial flutter, and atrial tachycardia with alternating A‐V conduction block.…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Cardiac Arrhythmias Imprint Specific Signatures on Lorenz Plots

Esperer

Cohen

2008

Noninvasive Electrocardiol

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Cardiac Arrhythmias Imprint Specific Signatures on Lorenz Plots

Esperer

Cohen

2008

Noninvasive Electrocardiol

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Heart Rate Variability Is Decreasing During Paroxysmal Atrial Fibrillation

Piot

Halimi

Jouven

et al. 1999

Noninvasive Electrocardiol

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Background:The high R-R variability in permanent atrial fibrillation (AF) is stable. Its behavior in paroxysmal AF is unknown. The aim of this study was to examine heart rate variability behavior during paroxysmal AF and its relationship with clinical characteristics by using time-domain indices and scatterplot analysis.Methods: In 43 patients, R-R variability was assessed by time-domain indices and graphical measurements of scattering area (SA) on scatterplot for each sample of 150-second ventricular rhythms extracted at the onset, the middle, and before termination of AF episodes recorded on Holter monitoring. Results were compared between the three time periods, and a nested procedure assessed the components of the SA variance.Results: In 11 0 episodes lasting 89 rfr 130 minutes with a mean of 2.5 ? 3 (1 -1 2) per patient, mean R-R interval did not significantly change while time-domain indices and SA significantly decreased between the three time periods (P < 0.05 for SD and CV, P < 1 0-2 for rMSSD and pNN50, P < 1 0-4 for SA, ANOVA 1). The magnitude of the decrease in SA was not related to any episode characteristic; in addition, there was no variation from episode to episode within patient (lo% of SA variance), and the high variation between patients (To%, P < was not related to any clinical parameter. Conclusions: Heart rate variability decreases gradually during paroxysmal AF. This decrease is peculiar to each patient, unrelated to clinical status.A.N.E. 1999;4(2):144-151 atrial fibrillation; Holter monitoring; heart rate variability; scatterplot ~~ Address for reprints:

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Ventricular contractility in atrial fibrillation is predictable by mechanical restitution and potentiation

Suzuki

Araki

Morita³

et al. 1998

American Journal of Physiology-Heart and Circulatory Physiology

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We recently found that contractility ( E max) of an individual irregularly arrhythmic beat in electrically induced atrial fibrillation (AF) is reasonably predictable from the ratio of the preceding beat interval (RR1) to the beat interval immediately preceding RR1 (RR2) in the canine left ventricle. Moreover, the monotonically increasing relation between E max and the RR1-to-RR2 ratio (RR1/RR2) passed through or by the mean arrhythmic beat E max as well as the regular beat E max at RR1/RR2 = 1. We hypothesized that this E max-RR1/RR2 relation during irregular arrhythmia could be attributed to the basic characteristics of the mechanical restitution and potentiation. To test this, we adopted a known comprehensive equation describing the force restitution and potentiation as a function of two preceding beat intervals and simulated contractilities of irregular arrhythmic beats with randomized beat intervals on a computer. The simulated E max-RR1/RR2 relation reasonably resembled the one that we recently observed experimentally, supporting our hypothesis. We therefore conclude that the primary mechanism underlying the varying contractilities of irregular beats in AF is mechanical restitution and potentiation.

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Silent zone on Lorenz plots of the ventricular response before termination of paroxysmal atrial fibrillation: Report of a case.

Cited by 3 publications

References 10 publications

Cardiac Arrhythmias Imprint Specific Signatures on Lorenz Plots

Cardiac Arrhythmias Imprint Specific Signatures on Lorenz Plots

Heart Rate Variability Is Decreasing During Paroxysmal Atrial Fibrillation

Ventricular contractility in atrial fibrillation is predictable by mechanical restitution and potentiation

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