28 Result(s)
within
A. Malliani
English
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Article
Bioethics, the Surviving Sepsis Campaign and the industry
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Article
Automatic classification of interference patterns in driven event series: application to single sympathetic neuron discharge forced by mechanical ventilation
This study proposes a method for the automatic classification of nonlinear interactions between a strictly periodical event series modelling the activity of an exogenous oscillator working at a fixed and well-...
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Article
Non-invasive model-based estimation of the sinus node dynamic properties from spontaneous cardiovascular variability series
A non-invasive model-based approach to the estimation of sinus node dynamic properties is proposed. The model exploits the spontaneous beat-to-beat variability of heart period and systolic arterial pressure an...
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Article
Analysis of cardiac left-ventricular volume based on time war** averaging
The cardiac left-ventricular (LV) volume signal, obtained by acoustic quantification, is affected by noise and respiratory modulation, resulting in a large beat-to-beat variability that affects the computation...
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Article
Quantifying the strength of the linear causal coupling in closed loop interacting cardiovascular variability signals
The coherence function measures the amount of correlation between two signals x and y as a function of the frequency, independently of their causal relationships. Therefore, the coherence function is not useful ...
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Article
Effects of sympathetic activation and regular periodic breathing on complexity of heart period variability
Background. Heart rate exhibits different levels of complexity which are probably related to the neural autonomic modulation. Aim of the study. The aim is to analyze the effect of the sympathetic activation and ...
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Article
Absence of sympathetic overactivity in Afro-Caribbean hypertensive subjects studied by heart rate variability
Black hypertensives present a greater prevalence of left ventricular hypertrophy and an increased mortality compared to white hypertensives. Differences in sympathetic activity might contribute to explain thes...
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Article
Information domain analysis of cardiovascular variability signals: Evaluation of regularity, synchronisation and co-ordination
A unifying general approach to measure regularity, synchronisation and co-ordination is proposed. This approach is based on conditional entropy and is specifically designed to deal with a small amount of data ...
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Article
Conditional entropy approach for the evaluation of the coupling strength
A method that enables measurement of the degree of coupling between two signals is presented. The method is based on the definition of an uncoupling function calculating, by means of entropy rates, the minimu...
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Article
Measuring regularity by means of a corrected conditional entropy in sympathetic outflow
A new method for measuring the regularity of a process over short data sequences is reported. This method is based on the definition of a new function (the corrected conditional entropy) and on the extraction...
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Article
Quantifying electrocardiogram RT-RR variability interactions
A dynamic linear parametric model is designed to quantify the dependence of ventricular repolarisation duration variability on heart period changes and other immeasurable factors. The model analyses the beat-t...
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Article
Classification of coupling patterns among spontaneous rhythms and ventilation in the sympathetic discharge of decerebrate cats
The spontaneous low- and high-frequency rhythms in the sympathetic discharge of decerebrate artificially ventilated cats are affected by external ventilation. Two graphical methods (i.e. the space-time separa...
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Article
Model for the assessment of heart period and arterial pressure variability interactions and of respiration influences
A model which assesses the closed-loop interaction between heart period (HP) and arterial pressure (AP) variabilities and the influence of respiration on both is applied to evaluate the sources of low frequenc...
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Chapter and Conference Paper
The Visceral Nervous System as a Link Between the Heart and the Brain: An Approach Employing Spectral Analysis of R-R and Systolic Arterial Pressure Variabilities
In the last decades western medicine has undergone obvious and dramatic changes as a consequence of the tremendous improvements in and the widespread use of technical resources: suffice it to recall the specta...
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Chapter and Conference Paper
The Neurovegetative System as a Link Between Internal and External Environments
The pious Naruddin used to take his five blind brothers to the caravanserrai once a year, on the occasion of the town restivities.
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Chapter and Conference Paper
Spectral Analysis of Cardiovascular Variables as a Tool to Quantify Neural Cardiovascular Control in the Laboratory and Real Life Conditions
The neural control of the circulation depends upon a continuous interaction between opposite, i.e. negative and positive, feed-back mechanisms, mediated respectively by vagal/baroreceptive and sympathetic circ...
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Chapter and Conference Paper
Power Spectral Analysis of Heart Rate and Arterial Pressure Variabilities as an Experimental and Clinical Tool
The possibility recently offered by computer techniques for quantifying the small spontaneous beat-by-beat oscillations characterizing the cardiovascular variables and in particular the electrocardiographic R-...
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Chapter
The autonomic disturbance accompanying myocardial infarction
To evalauate the alteration of sympatho-vagal balance after myocardial infarction we compared the spectral components of heart variability of 70 patients at 2 weeks, 6 and 12 months after myocardial infarction...
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Chapter
The sympatho-vagal balance and arterial hypertension
The view of arterial hypertension as an abnormal “quantity” is the well known milestone introduced by Pickering (1) in modern pathophysiological thinking. This provocative hypothesis opened the door to the sea...
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Chapter and Conference Paper
Physiological Aspects of Pain Perception and Transmission
In Leben des Galilei by Bertolt Brecht it is written that “the aim of science is not to open a door to infinite wisdom but to set a limit to infinite error.” This proposal seems particularly appropriate for the p...
