Inclusion Criteria:

• Patients must be aged 18 or over.
• Patients must provide written informed consent.
• Patients are presenting with unstable angina (defined as new onset chest pain, accelerating chest pain, chest pain at rest and ST-segment depression on the electrocardiogram [EKG])
• Patients undergoing successful coronary stent implantation of the (presumed) culprit lesion (defined as < 50% residual stenosis).

Exclusion Criteria:

• Any patient who is unable to give written informed consent.
• Any condition which, in the investigator's opinion, would interfere with optimal participation in the study or produce a significant risk to the patient.
• Patients presenting with an ST-elevation myocardial infarction (MI).
• Patients with elevated troponin, CK, or CK-MB (above the upper limit of normal).
• Patients already on high-dose statin therapy (defined as any statin equivalent to atorvastatin ≥ 40 mg).
• Patients who took any statin agent within 24 hours of presentation to the cardiac catheterization laboratory.
• Patients with active hepatic disease or myositis, in whom statin therapy is contraindicated.
• Patients with hypersensitivity to atorvastatin.
• Patients with procedural complications, including unsuccessful percutaneous transluminal coronary angioplasty (PTCA)/stenting, major side-branch occlusion, flow-limiting dissections at the completion of the procedure, emergent coronary artery bypass surgery, peri-procedural thrombus formation with distal embolization, stent thrombosis within the first 24 hours, repeat emergent PCI within 24 hours, and death within 24 hours.
• Cardiogenic shock.