Abstract
Percutaneous coronary intervention (PCI) provides an elegant model to deal with this issue in patients with CAD. During angioplasty, myocardial blood supply is diminished below normal depending on the collateral supply from adjacent vascular regions. Absolute perfusion or myocardial blood flow (MBF, ml/min/g) can be obtained from positron emission tomography and, of late, from myocardial contrast echocardiography (MCE).2 However, only MCE is applicable during PCI owing to its mobility and short acquisition time.