Prediction of CK-MB Release During Otherwise Successful Stenting Procedure

Post-procedure CK-MB and troponin I (TnI) and HsCRP elevation, in the absence of obvious procedural events, is most likely caused by distal micro-thromboembolism of platelet aggregates and atheromatous debris causing microvascular bed obstruction. This, in turn, will result in lower coronary flow reserve and regional left ventricular (LV) dysfunction. Therefore, patients with normal CFV/CFR (coronary flow velocity/reserve) by Doppler wire and FFR (fractional flow reserve) by flow wire should have no peri-procedural CK-MB, TnI elevation as compared to patients with peri-procedural CK-MB and TnI elevation where all markers of microcirculation will be reduced. This observation will have a prognostic value at short and long-term. This study may also have clinical implications for patients with intra-coronary stenting and normal microvascular parameters post PCI that these patients may be discharged early while others may need to be monitored in-hospital for an extended period of time.

Inclusion criteria

• Patients >18 years of age
• Stable patients who will undergo PCI (intent to stent)
• Patients with de novo type B2/C lesions of native coronary vessels

Exclusion criteria

• Patients with acute myocardial infarction (Q wave or non-Q wave with CK-MB 5 times above the upper normal [80 U/L] within 72 hours)
• Patients who are in cardiogenic shock
• Patients with restenotic lesions
• Patients with type A and type B1 lesions of native coronary vessels
• Patients who require use of atherectomy devices for PCI
• Patients who have elevated CK-MB (>16 U/L) or TnI (>2ng/L) at baseline
• Patients who receive tirofiban or eptifibatide infusion within 24 hours of PCI
• Patients with known allergy to abciximab and adenosine
• Patients with platelet count <100,000 cell/mm3
• Patients who have co-morbidity which reduces life expectancy to one year
• Patients who are currently participating in another investigational drug/device study