From the Guidelines
For suspected old heart attack and angina, I recommend ordering cardiac troponin I or T, CK-MB, complete blood count (CBC), comprehensive metabolic panel (CMP), lipid profile, hemoglobin A1c, brain natriuretic peptide (BNP), high-sensitivity C-reactive protein, and an electrocardiogram (ECG) as the initial diagnostic workup. The most recent guidelines from the European Heart Journal 1 emphasize the importance of a detailed assessment of cardiovascular risk factors, medical history, and symptom characteristics in individuals with suspected chronic coronary syndrome. Key laboratory tests to order include:
- Cardiac biomarkers such as troponin I or T and CK-MB to assess for myocardial damage
- Basic biochemistry tests like CBC and CMP to provide baseline information on overall health status
- Lipid profile to evaluate cardiovascular risk
- Hemoglobin A1c to screen for diabetes
- BNP to assess for heart failure
- High-sensitivity C-reactive protein to evaluate inflammation An ECG is also crucial to identify Q waves or ST-T changes suggestive of prior infarction. For ongoing angina evaluation, consider exercise stress testing or cardiac imaging to evaluate current cardiac function and ischemia, as recommended by the ACC/AHA 2002 guideline update for exercise testing 2. Additionally, the 2024 ESC guidelines for the management of chronic coronary syndromes 1 suggest estimating the pre-test likelihood of obstructive epicardial CAD using the Risk Factor-weighted Clinical Likelihood model and considering non-invasive anatomical imaging tests like coronary computed tomography angiography (CCTA) or stress echocardiography for further diagnosis and risk stratification. It's essential to prioritize the most recent and highest-quality study, which in this case is the 2024 ESC guidelines 1, to guide the diagnostic workup and management of suspected old heart attack and angina.
From the Research
Labs to Order for Suspected Old Heart Attack and Angina
To diagnose and manage suspected old heart attack and angina, several laboratory tests can be ordered. These include:
- Electrocardiography (ECG) to check for ST depression, ST elevation, T-wave inversion, or presence of Q waves, which can predict acute coronary syndrome (ACS) 3
- Troponin levels to diagnose non-ST-segment elevation ACS, as elevated troponin levels without ST-segment elevation on electrocardiography suggest non-ST-segment elevation ACS 3
- Complete blood count (CBC) parameters, such as:
- Total white blood cell count
- Neutrophil count
- Red cell distribution width
- Neutrophil-to-lymphocyte ratio which may provide some clues when predicting troponin elevation in patients with chest pain, although none of these parameters or combinations have sufficiently good diagnostic test criteria results to safely predict non-ST segment elevation myocardial infarction 4
- Other tests, such as cardiac stress test, may also be useful in diagnosing and managing suspected old heart attack and angina, as a prior abnormal cardiac stress test result indicates increased risk 3