dorsal/arxiv
View SchemaA quantitative measurement of spatial order in ventricular fibrillation
| Authors | P. V. Bayly, E. E. Johnson, P. D. Wolf, H. S. Greenside, W. M. Smith, R. E. Ideker |
|---|---|
| Categories | |
| ArXiv ID | patt-sol/9307001 |
| URL | https://arxiv.org/abs/patt-sol/9307001 |
Abstract
As an objective measurement of spatial order in ventricular fibrillation (VF), spatial correlation functions and their characteristic lengths were estimated from epicardial electrograms of pigs in VF. The correlation length of the VF in pigs was found to be approximately 4-10 mm, varying as fibrillation progressed. The degree of correlation decreased in the first 4 seconds after fibrillation then increased over the next minute. The correlation length is much smaller than the scale of the heart, suggesting that many independent regions of activity exist on the epicardium at any one time. On the other hand, the correlation length is 4 to 10 times the interelectrode spacing, indicating that some coherence is present. These results imply that the heart behaves during VF as a high-dimensional, but not random, system involving many spatial degrees of freedom, which may explain the lack of convergence of fractal dimension estimates reported in the literature. Changes in the correlation length also suggest that VF reorganizes slightly in the first minute after an initial breakdown in structure.
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"abstract": "As an objective measurement of spatial order in ventricular fibrillation\n(VF), spatial correlation functions and their characteristic lengths were\nestimated from epicardial electrograms of pigs in VF. The correlation length of\nthe VF in pigs was found to be approximately 4-10 mm, varying as fibrillation\nprogressed. The degree of correlation decreased in the first 4 seconds after\nfibrillation then increased over the next minute. The correlation length is\nmuch smaller than the scale of the heart, suggesting that many independent\nregions of activity exist on the epicardium at any one time. On the other hand,\nthe correlation length is 4 to 10 times the interelectrode spacing, indicating\nthat some coherence is present. These results imply that the heart behaves\nduring VF as a high-dimensional, but not random, system involving many spatial\ndegrees of freedom, which may explain the lack of convergence of fractal\ndimension estimates reported in the literature. Changes in the correlation\nlength also suggest that VF reorganizes slightly in the first minute after an\ninitial breakdown in structure.",
"arxiv_id": "patt-sol/9307001",
"authors": [
"P. V. Bayly",
"E. E. Johnson",
"P. D. Wolf",
"H. S. Greenside",
"W. M. Smith",
"R. E. Ideker"
],
"categories": [
"patt-sol",
"nlin.PS",
"q-bio"
],
"title": "A quantitative measurement of spatial order in ventricular fibrillation",
"url": "https://arxiv.org/abs/patt-sol/9307001"
},
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