Noninvasive Cardiac Testing.

For patients with chest discomfort, noninvasive cardiac testing can be used for the diagnosis of acute coronary syndrome and for the evaluation of the risk of future cardiovascular events and disease severity in patients with known coronary artery disease. Clinical prediction rules can guide risk assessment for patients with acute or stable chest discomfort. For acute chest discomfort, patients with low risk do not need urgent testing, and those at high risk should have invasive coronary angiography.