Should slow coronary flow be considered as a coronary syndrome?

It is not certain, however, whether slow coronary flow phenomenon in the absence of any of known causes represents merely an angiographic curiosity or has special physiologic or therapeutic implications up to now. What kind of factors or etiologic reasons contributes to slow coronary flow? Is slow coronary flow an independent entity of coronary artery disease? All of those answers are still unknown and deserves further investigation. In our opinion, slow coronary flow without evident cause may represent a new entity of coronary heart disease. Therefore, we would like to consider it as a syndrome, and call it as a “slow coronary flow syndrome”.