The Living Guidelines: STEMI Immediate (or Emergency) Invasive Strategy and Rescue PCI Polling Results for CLASS IIa Guidelines
1- A strategy of coronary angiography with intent to perform PCI (or emergency CABG) is reasonable in patients 75 years of age who have received fibrinolytic therapy, and are in cardiogenic shock, provided that they are suitable candidates for revascularization. (Class IIa, Level of Evidence: B) 
AHA / ACC 2007 STEMI Guidelines for Immediate (or Emergency) Invasive Strategy and Rescue PCI Class IIa Recommendation 1 should be
2- It is reasonable to perform rescue PCI for patients with 1 or more of the following:
a. Hemodynamic or electrical instability. (Class IIa, Level of Evidence: C)
AHA / ACC 2007 STEMI Guidelines for Immediate (or Emergency) Invasive Strategy and Rescue PCI Class IIa Recommendation 2a should be
b. Persistent ischemic symptoms. (Class IIa, Level of Evidence: C)
AHA / ACC 2007 STEMI Guidelines for Immediate (or Emergency) Invasive Strategy and Rescue PCI Class IIa Recommendation 2b should be
3. A strategy of coronary angiography with intent to perform rescue PCI is reasonable for patients in whom fibrinolytic therapy has failed (ST segment elevation < 50% resolved after 90 minutes following initiation of fibrinolytic therapy in the lead showing the worst initial elevation) and a moderate or large area of myocardium at risk (anterior MI, inferior MI with right ventricular involvement or precordial ST segment depression). (Class IIa, Level of Evidence: B) 
AHA / ACC 2007 STEMI Guidelines for Immediate (or Emergency) Invasive Strategy and Rescue PCI Class IIa Recommendation 3 should be

# Reference
-  STEMI Focused Update, 2007 Focused Update of the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction: A Report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines. Developed in Collaboration With the Canadian Cardiovascular Society; Endorsed by the American Academy of Family Physicians; 2007 Writing Group to Review New Evidence and Update the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction. Antman E.M., Hant M., Armstrong P.W., et. al., 2007 Focused updates of the ACC/AHA 2004 Guidelines for the Management of Patients with ST-Elevation Myocardial Infarction. A report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines Circulation 117 (2):296-329, January 15, 2008.
-  STEMI Focused Update, 2007 Focused Update of the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction: A Report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines. Developed in Collaboration With the Canadian Cardiovascular Society; Endorsed by the American Academy of Family Physicians; 2007 Writing Group to Review New Evidence and Update the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction. Antman E.M., Hant M., Armstrong P.W., et. al., 2007 Focused updates of the ACC/AHA 2004 Guidelines for the Management of Patients with ST-Elevation Myocardial Infarction. A report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines Circulation 117 (2):296-329, January 15, 2008.
-  STEMI Focused Update, 2007 Focused Update of the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction: A Report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines. Developed in Collaboration With the Canadian Cardiovascular Society; Endorsed by the American Academy of Family Physicians; 2007 Writing Group to Review New Evidence and Update the ACC/AHA 2004 Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction. Antman E.M., Hant M., Armstrong P.W., et. al., 2007 Focused updates of the ACC/AHA 2004 Guidelines for the Management of Patients with ST-Elevation Myocardial Infarction. A report of the American College of Cardiology / American Heart Association Task Force on Practice Guidelines Circulation 117 (2):296-329, January 15, 2008.