<unk>  is a measure of the ability of the<unk>  artery to increase<unk>  blood flow in response to a hyperemic stimulus.  A normal<unk>  is a value above 2.0. . In other words, ordinarily the<unk>  artery can double its blood flow in response to the administration of adenosine.<unk>  interrogates both the epicardial blockage(s) as well as the resistance in the downstream capillary bed. This is in contrast to fractional flow reserve or FFR which reflects only abnormalities of the epicardial stenosis, and does not reflect abnormalities of the downstream microvascular bed.
Coronary flow reserve
Fractional flow reserve
Ejection fraction
Pulse wave velocity
Arteriovenous oxygen difference
Stroke volume
Mean arterial pressure
Pulmonary capillary wedge pressure