The use of logistic regression in choosing method of cardioplegia

In bypass surgery in acute myocardial infarction a cardiac standstill is expected for manipulating coronary vessels. To protect the heart muscle (myocardium), special techniques are applied. Paper presents the results of the mathematical modeling choice method of protection (cardioplegia) myocardium during coronary artery bypass surgery. As a guideline for choosing cardioplegia is used forecasting the outcome of the operation using a mathematical model of logistic regression, allowing a certain probability attributed the outcome of the operation to one of two classes: a favorable outcome or unfavorable. The inclusion of variables in the regression model was carried out by using the method "forward selection", i.e., consistent inclusion of variables that increase the adequacy and the value of the log-likelihood function of the model and serial elimination of variables reducing the adequacy. The values of the weighting coefficients in the model are calculated using the Newton-Raphson algorithm. Computer investigation method of choice cardioplegia models showed that the use of a particular method of myocardial protection during surgery caused by influence of various parameters describing the condition of the patient before surgery.

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