The Importance of the Type of Heart Circulation for the Prognosis of Pulmonary Embolism

Aim. To study the distribution of the type of heart circulation (left- dominant, right- dominant, and mixed (balanced) in patients with pulmonary thromboembolism of fatal and non-fatal outcome. Materials and methods. More than 36,000 case histories, protocols and findings of post-mortem examinations of patients hospitalized in 2003–2012 were subjected to analysis. (ten year period). Statistical processing of the actual material was carried out using the SAS 9 and SPSS 21 software packages. The critical level of significance p for all used procedures of statistical analysis was assumed to be 0.05. Results of the study. The study included 893 cases of pulmonary embolism registered in the data of the case histories and materials of the pathoanatomical studies. Data on the type of heart circulation and a detailed description of the coronary artery atherosclerosis were present in 264 cases: in 171 patients with pulmonary embolism and fatal outcome, and in 93 patients with pulmonary embolism and non-fatal outcome. A clear predominance was found in the group with pulmonary embolism and non-fatal outcome of patients with the right type of heart circulation – 78.5% versus 7% in the group of people who died with pulmonary embolism (p<0.0001). Accordingly, persons with “non-right type of heart circulation” (left and balanced) predominantly prevailed among patients with pulmonary embolism and fatal outcome. At the same time, the dead with the right type of heart circulation in all cases had a stenosis of the right coronary artery (RCA) more than 60%. RCA dominance in the heart circulation with absence its significant stenosis creates more favorable hemodynamic conditions for survival in patients with pulmonary embolism. Owners of other types of organization of coronary blood flow (“non-right type of heart circulation”) have a worse prognosis both in the absence of coronary atherosclerosis and, moreover, in its presence, especially in the case of significant atherosclerotic lesion of the RCA pool. At the same time, in patients with the right type of heart circulation and hemodynamically significant atherosclerosis RCA in conditions of pulmonary embolism the prognosis is also unfavorable. In view of the above, in patients with coronary atherosclerosis, timely restoration of blood flow in RCA (coronary artery stenting) is great importance in relation to the prognosis associated not only with coronary heart disease, but also with PE.

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