20 Result(s)
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Article
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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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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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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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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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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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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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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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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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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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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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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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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Tonic afferent sympathetic activity from the heart
Nous avons enregistré dans les nerfs sympathiques la décharge de fibres afférentes isolées provenant de chacune des cavités cardiaques. Cette décharge était en rapport avec les événements hémodynamiques qui av...
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Activation of cardiac vagal receptors during myocardial ischemia
La décharge de fibres vagales d'origine cardiaque est augmentée au cours d'une réduction du flux sanguin dans l'artère coronaire de gauche. Toutefois cette excitation n'a lieu que lorsque le coeur est déjà déf...
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Evidence for a spinal sympathetic regulation of cardiovascular functions
La décharge de fibres sympathiques préganglionnaires isolées, faisant probablement partie de l'innervation efférente du cœr, a été étudiée sur des chats spinalisés et vagotomisés par rapport à des augmentation...
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Reflex activity of single preganglionic sympathetic fibres during coronary occlusion
La décharge de fibres sympathiques préganglionnaires isolées, faisant probablement partie de l'innervation efférente du cœur, a été étudiée sur des chats, soit anésthésiés, soit décérébrés, soit spinalisés, pa...
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Excitation of sham rage behaviour by controlled electrical stimulation of group I muscle afferents
La stimolazione elettrica ad alta cadenza (100–600 c/sec) del puro contingente di fibre muscolari appartenenti al gruppo I è in grado di scatenare accessi di falsa rabbia nel gatto decorticato, anche dopo abla...
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Local Tissue Lesions as a Means of Assessing the Local or Remote Origin of Evoked Potentials within the Brain
EVOKED potentials are often recorded ‘monopolarly’, that is, by means of an exploratory electrode referred to a distant ‘indifferent’ lead. Although this procedure makes it possible to determine the polarity o...
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Reflex regulation of consciousness and emotional behaviour
The afferent modulation of the central nervous mechanisms regulating conscious behaviour is discussed, and compared to the effects of afferent and brain stem stimulation on the emotional behaviour of diencepha...
