Digital Model of Blood Circulation Analysis System

Mačiulis, Audris; Paunksnis, Alvydas; Barzdžiukas, Valerijus; Kriauciuniene, Loresa; Buteikienė, Dovilė; Puzienė, Viktorija

doi:10.15388/informatica.2009.265

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…representing the probability that a patient is in state j of the disease at the (n + 1)th transition within chronological time t, given that at the nth transition she/he entered state i at time s being aged a + s. In such a way the model is able to consider transition probabilities taking into account both the patient's age and the medical scientific progress due to the chronological time effect. The medical scientific progress are due to the creation of diagnostic medicine systems, see for example Maciulis et al (2009). The dependence of the transition rates on the age of the patient is considered using a semi-Markov model with age index.…”

Section: Age-time Dependence Stochastic Modelmentioning

confidence: 99%

HIV Evolution: A Quantification of the Effects Due to Age and to Medical Progress

et al. 2011

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This paper offers an analysis of HIV/AIDS dynamics, defined by CD4 levels and Viral load, carried out from a macroscopic point of view by means of a general stochastic model. The model focuses on the patient's age as a relevant factor to forecast the transitions among the different levels of seriousness of the disease and simultaneously on the chronological time. The third model considers the two previous features simultaneously. In this way it is possible to quantify the medical scientific progresses due to the advances in the treatment of the HIV. The analyses have been performed through non-homogeneous semi-Markov processes. These models have been implemented by using real data provided by ISS (Istituto Superiore di Sanità, Rome, Italy). They refer to 2159 subjects enrolled in Italian public structures from September 1983 to January 2006. The relevant results include also the survival analysis of the infected patients. The computed conditional probabilities show the different responses of the subjects depending on their ages and the elapsing of time.

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Section: Age-time Dependence Stochastic Modelmentioning

confidence: 99%

HIV Evolution: A Quantification of the Effects Due to Age and to Medical Progress

et al. 2011

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“…This phenomenon is not very common in standard time-delay systems where delays do not play usually a relevant role in the parameterizations but only in the state-trajectory solution through the delayed state dynamics (De la Sen, 2003; De la Sen and Luo, 2004;Luo et al, 1997). It has to be pointed out that the use of mathematical models supported by electronics instrumentation is also very relevant for the study of biological process such as models of blood circulation because of its facility for discretized implementation of real testing experiments (see, for instance, Maciulis et al, 2009). It has also to be pointed out that epidemic models are not controllable in the sense that all the populations cannot be simultaneously governed (Nieto and Tisdell, 2010).…”

Section: Introductionmentioning

confidence: 99%

On the Equilibrium Points, Boundedness and Positivity of a Sveirs Epidemic Model under Constant Regular Constrained Vaccination

et al. 2011

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This paper discusses the disease-free and endemic equilibrium points of a SVEIRS propagation disease model which potentially involves a regular constant vaccination. The positivity of such a model is also discussed as well as the boundedness of the total and partial populations. The model takes also into consideration the natural population growing and the mortality associate to the disease as well as the lost of immunity of newborns. It is assumed that there are two finite delays affecting to the susceptible, recovered, exposed and infected population dynamics.

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“…During coronary artery bypass grafting operations a surgeon requires information regarding the coronary flow, coronary anatomy, and myocardial perfusion. Additional quantitative flow estimation is desirable to detect graft failures as early as possible (Mačiulis et al, 2009). Some pictures taken from the thermovisual video stream are presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermovisual Data of the Radio-Frequency Impact on the Myocardium Damage

et al. 2010

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In this article, a method is proposed for analysing the thermovision-based video data that characterize the dynamics of temperature anisotropy of the heart tissue in a spatial domain. Many cardiac rhythm disturbances at present time are treated by applying destructive energy sources. One of the most common source and the related methodology is to use radio-frequency ablation procedure. However, the rate of the risk of complications including arrhythmia recurrence remains enough high. The drawback of the methodology used is that the suchlike destruction procedure cannot be monitored by visual spectra and results in the inability to control the ablation efficiency. To the end of understanding the nature of possible complications and controlling the treating process, the means of thermovision could be used. The aim of the study was to analyse possible mechanisms of these complications, measure and determine optimal radio-frequency ablation parameters, according to the analysis of video data, acquired using thermovision.

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Digital Model of Blood Circulation Analysis System

Cited by 8 publications

References 13 publications

HIV Evolution: A Quantification of the Effects Due to Age and to Medical Progress

HIV Evolution: A Quantification of the Effects Due to Age and to Medical Progress

On the Equilibrium Points, Boundedness and Positivity of a Sveirs Epidemic Model under Constant Regular Constrained Vaccination

Analysis of Thermovisual Data of the Radio-Frequency Impact on the Myocardium Damage

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