Comput Math Methods Med - Normality index of ventricular contraction based on a statistical model from FADS.

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Resumo

Radionuclide-based imaging is an alternative to evaluate ventricular function and synchrony and may be used as a tool for the identification of patients that could benefit from cardiac resynchronization therapy (CRT). In a previous work, we used Factor Analysis of Dynamic Structures (FADS) to analyze the contribution and spatial distribution of the 3 most significant factors (3-MSF) present in a dynamic series of equilibrium radionuclide angiography images. In this work, a probability density function model of the 3-MSF extracted from FADS for a control group is presented; also an index, based on the likelihood between the control group's contraction model and a sample of normal subjects is proposed. This normality index was compared with those computed for two cardiopathic populations, satisfying the clinical criteria to be considered as candidates for a CRT. The proposed normality index provides a measure, consistent with the phase analysis currently used in clinical environment, sensitive enough to show contraction differences between normal and abnormal groups, which suggests that it can be related to the degree of severity in the ventricular contraction dyssynchrony, and therefore shows promise as a follow-up procedure for patients under CRT.

Resumo Limpo

radionuclidebas imag altern evalu ventricular function synchroni may use tool identif patient benefit cardiac resynchron therapi crt previous work use factor analysi dynam structur fad analyz contribut spatial distribut signific factor msf present dynam seri equilibrium radionuclid angiographi imag work probabl densiti function model msf extract fad control group present also index base likelihood control group contract model sampl normal subject propos normal index compar comput two cardiopath popul satisfi clinic criteria consid candid crt propos normal index provid measur consist phase analysi current use clinic environ sensit enough show contract differ normal abnorm group suggest can relat degre sever ventricular contract dyssynchroni therefor show promis followup procedur patient crt

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