The audit shows continuous improvement in a number of aspects of the quality of care for patients following heart attack. Immediate (primary) percutaneous coronary intervention (PCI) is now established as the preferred way to reopen a blocked artery (reperfusion) in ST-elevation myocardial infarction (STEMI). PCI rates increased in all nations covered in this report. Of patients who received reperfusion, 98% received PCI. The rate of primary PCI in Wales (80%) is significantly lower than in England (99%) or Northern Ireland (92%), but is increasing steadily (from 30% in 2010-11).