<P> If acute coronary syndrome ("heart attack") is suspected, many people are admitted briefly for observation, sequential ECGs, and measurement of cardiac enzymes in the blood over time . On occasion, further tests on follow up may determine the cause . </P> <P> On the basis of the above, a number of tests may be ordered: </P> <Ul> <Li> An electrocardiogram (ECG) </Li> <Li> Chest radiograph or chest x rays are frequently performed </Li> <Li> Echocardiography can be useful in patients with known cardiac disease or aortic dissection </Li> <Li> CT scanning is used in the diagnosis of aortic dissection </Li> <Li> V / Q scintigraphy or CT pulmonary angiogram (when a pulmonary embolism is suspected) </Li> <Li> Blood tests: <Ul> <Li> Troponin I or T (to indicate myocardial damage) </Li> <Li> Complete blood count </Li> <Li> Electrolytes and renal function (creatinine) </Li> <Li> Liver enzymes </Li> <Li> Creatine kinase (and CK - MB fraction in many hospitals) </Li> <Li> D - dimer (when suspicion for pulmonary embolism is present but low) </Li> <Li> serum lipase to exclude acute pancreatitis </Li> </Ul> </Li> </Ul> <Li> An electrocardiogram (ECG) </Li>

What test are used to determine the cause of chest pain
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