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Aim: was to reveal factors that cause dyspnea in the early postoperative period after cardiac surgery.

Materials and methods: the study included 818 patients after cardiosurgical interventions in «F^S» Penza from June 2014 to February 2015, with complaints of shortness of breath at rest. The degree of influence of variables was determined using ROC analysis and logistic regression analysis.

Results: dyspnea was noted in 169 patients (19.4 %). ROC-analysis revealed a very large influence on the occurrence of dyspnoea disturbances of the mobility of the diaphragm, the great influence of the frequency of respiratory movements, the average impact of the height of diaphragm domes and low impact of body mass index. Results of logistic regression analysis showed that odds increase in 327 times at a decreased mobility of the left dome of the diaphragm 49 times in dysfunction of the right dome, 4,4-times elevation in the left dome, 3,5 times at the elevation of the right dome, 3.9 times with tachypnea and 2,6 times for severe obesity, in 1,5 times in chronic heart failure II B degree. Other factors, included in research, didn't influence on dispnea appearance.

Conclusions: a leading factor in the occurrence of dyspnea is dysfunction of the diaphragm, especially when decreased mobility of the left dome. To a lesser extent, reasons can be the elevation of diaphragm domes and tachypnea. Obesity 2 and 3 degree and chronic heart failure II B degree, had a small effect on dyspnea.



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