Results 41 to 50 of about 140,397 (204)

Entropy in the natural time-domain [PDF]

Phys. Rev. E 70, 011106 (2004), 2005
A surrogate data analysis is presented, which is based on the fluctuations of the ``entropy'' $S$ defined in the natural time-domain [Phys. Rev. E {\bf 68}, 031106, 2003]. This entropy is not a static one as, for example, the Shannon entropy. The analysis is applied to three types of time-series, i.e., seismic electric signals, ``artificial'' noises ...
arxiv   +1 more source

Sudden cardiac death in sport. [PDF]

BMJ, 1983
Etude de la frequence des morts subites liees au sport. Causes: cardiopathies coronariennes, anomalies anatomiques cardiovasculaires, autres causes. Prevention : controle medical avant les activites, interdiction des efforts excessifs, reconnaissance des prodromes, prevention du choc thermique, abstention du ...
David Ballantyne, Robin J. Northcote
openaire   +3 more sources

Natural entropy fluctuations discriminate similar looking electric signals emitted from systems of different dynamics [PDF]

Phys. Rev. E. 71, 011110 (2005), 2005
Complexity measures are introduced, that quantify the change of the natural entropy fluctuations at different length scales in time-series emitted from systems operating far from equilibrium. They identify impending sudden cardiac death (SD) by analyzing fifteen minutes electrocardiograms, and comparing to those of truly healthy humans (H).
arxiv   +1 more source

Cardiac Innervation and Sudden Cardiac Death [PDF]

Circulation Research, 2015
Afferent and efferent cardiac neurotransmission via the cardiac nerves intricately modulates nearly all physiological functions of the heart (chronotropy, dromotropy, lusitropy, and inotropy). Afferent information from the heart is transmitted to higher levels of the nervous system for processing (intrinsic cardiac nervous system, extracardiac ...
Fukuda, Keiichi, Kanazawa, Hideaki, Aizawa, Yoshiyasu, Ardell, Jeffrey L, Shivkumar, Kalyanam   +4 more
openaire   +4 more sources

The Metabolic Syndrome and Risk of Sudden Cardiac Death: The Atherosclerosis Risk in Communities Study

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2017
BackgroundPrior studies have demonstrated a link between the metabolic syndrome and increased risk of cardiovascular mortality. Whether the metabolic syndrome is associated with sudden cardiac death is uncertain.
Paul L. Hess, Hussein R. Al‐Khalidi, Daniel J. Friedman, Hillary Mulder, Anna Kucharska‐Newton, Wayne R. Rosamond, Renato D. Lopes, Bernard J. Gersh, Daniel B. Mark, Lesley H. Curtis, Wendy S. Post, Ronald J. Prineas, Nona Sotoodehnia, Sana M. Al‐Khatib   +13 more
doaj   +1 more source

Sudden death and sudden birth of entanglement in common structured reservoirs [PDF]

, 2008
We study the exact entanglement dynamics of two qubits in a common structured reservoir. We demonstrate that, for certain classes of entangled states, entanglement sudden death occurs, while for certain initially factorized states, entanglement sudden birth takes place.
arxiv   +1 more source

Multiscale studies of delayed afterdepolarizations I: A comparison of two biophysically realistic mathematical models for human ventricular myocytes [PDF]

arXiv, 2023
Focal arrhythmias, which arise from delayed afterdepolarizations (DADs), are observed in various pathophysiological heart conditions; these can lead to sudden cardiac death. A clear understanding of the electrophysiological factors of cardiac myocytes, which lead to DADs, can suggest pharmacological targets that can eliminate DAD-induced arrhythmias ...
arxiv  

Cardiac Innervation and Sudden Cardiac Death [PDF]

Current Cardiology Reviews, 2009
The heart is extensively innervated and its performance is tightly controlled by the nervous system. Cardiac innervation density varies in diseased hearts leading to unbalanced neural activation and lethal arrhythmia. Diabetic sensory neuropathy causes silent myocardial ischemia, characterized by loss of pain perception during myocardial ischemia ...
Masaki Ieda, Keiichi Fukuda
openaire   +3 more sources

Review on Non-Invasive Risk Stratification of Sudden Cardiac Death

Proceedings of Singapore Healthcare, 2011
Sudden cardiac death (SCD) is one of the most significant and challenging problems facing modern medicine today given its unpredictable nature. The evaluation of the patient at risk for sudden cardiac death still remains a complex task.
Jiang Ming Fam MBBS, MRCP (UK), MMed (Internal Med), Chi Keong Ching MBBS, MRCP (UK), FAMS   +1 more
doaj   +1 more source

Entanglement Sudden Death in Band Gaps [PDF]

, 2009
Using the pseudomode method, we evaluate exactly time-dependent entanglement for two independent qubits, each coupled to a non-Markovian structured environment. Our results suggest a possible way to control entanglement sudden death by modifying the qubit-pseudomode detuning and the spectrum of the reservoirs.
arxiv   +1 more source