In acute chest pain, what sequence of steps optimizes diagnostic yield while minimizing harm?

• A. Assess red flags and pretest probability, obtain high-yield tests with good sensitivity, interpret results using likelihood ratios, and avoid unnecessary invasive testing.
• B. Always perform invasive testing first to confirm diagnosis.
• C. Rely solely on initial ECG findings without further testing.
• D. Delay testing until the patient stabilizes with no initial assessment.

Answer: (A)

In acute chest pain, the best approach is to combine risk stratification with diagnostic testing in a way that updates your probability as new information comes in, while avoiding unnecessary procedures. Start by assessing red flags and estimating the patient's pretest probability for serious causes. Then obtain tests that have high diagnostic yield and good sensitivity for early detection—used in a sequence that matches the suspected problem (for example, ECG and high-sensitivity troponin when myocardial infarction is a concern). Interpret each result using likelihood ratios to update the post-test probability, guiding further testing or treatment decisions rather than jumping straight to invasive procedures. Only proceed with invasive testing when the balance of probabilities and the clinical picture justify it, thereby minimizing harm and resource use. Relying solely on the initial ECG, delaying testing, or testing invasively without first applying risk stratification and noninvasive testing, would either miss important conditions or expose the patient to unnecessary risk.