Kardiologiya
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The difference in hemoglobin affinity for oxygen in blood of the coronary sinus and in mixed venous blood was shown in dog experiments. The lower affinity of hemoglobin for blood flowing from the heart causes greater deoxidation of oxyhemoglobin. ⋯ On the grounds of in vitro experiments it is suggested that this effect is mediated by adenosine 3,5-cyclic monophosphate entering the blood. The author discusses the importance of the flow rate of blood and adenosine 3,5-cyclic monophosphate as factors responsible for the specific features of the regulation of hemoglobin affinity to oxygen within organs and the possible ethiopathogenetic significance of increased hemoglobin affinity for oxygen in the development of myocardial hypoxia.