Not necessarily. A cardiac angiography is often performed in close temporal proximity to a "heart attack" or myocardial infarction/injury. Cardiac angiography is a basic diagnostic tool that often provides invaluable information regarding the nature of an ischemic event, (i.e.Identify culprit lesions), and it can also be therapeutic as well when combined with an intervention, such as angioplasty or stent placement.
NO. Ideally should be done within minutes of the first heart attack so an emergency percutaneous coronary intervention can be carried out to open up the coronary and stop the infarct process.If it takes more than an hour the results are not as optimal. If the lesion is not amenable for pci then emergency coronary bypass surgery can be considered. If the patient >4hrs, outcome inferior.