Key result
Shunt flow through coronary-luminal communicating channels into the left heart chambers accounts for several percent of total coronary flow in experimental heart models.
The study experimentally demonstrated that coronary-luminal shunt flow accounts for several percent of total coronary flow, suggesting it does not significantly impact nitrous oxide method reliability in coronary venous catheterization.
Minor shunt flow supports experimental method reliability; leaves open relevance to human coronary flow quantification.
Thebesian veins and Wearn's arterio-luminal and arterio-sinusoidal vessels have been collectively named the coronary-luminal communicating channels by the author. As to their functional or physiological properties, little has been known yet, because of the extreme difficulties encountered in measurements of their blood flow. The author experimentally demonstrated the existence of shunt flow through these communicating channels, in fibrillating heart, in heart beating in situ, and in isolated, perfused, beating heart.The proportion of the shunt flow draining into the left heart chambers to the total coronary flow was estimated to be several per cent in fibrillating heart and in isolated, perfused, beating heart. Therefore, the coronary-luminal shunt flow does not seem to influence too much the reliability of the nitrous oxide method in coronary venous catheterization.It has been also suggested that this shunt flow might act as a compensatory mechanism, under certain hemodynamic changes such as the elevation of intra-cardiac pressure on the right side.
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Yoshio Watanabe (1960) studied Coronary circulation physiology. Coronary-luminal communicating channels shunt flow was evaluated on Proportion of shunt flow draining into the left heart chambers to the total coronary flow. Shunt flow through coronary-luminal communicating channels into the left heart chambers accounts for several percent of total coronary flow in experimental heart models.
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