A 64‑year‑old client arrives at the emergency department rep…
A 64‑year‑old client arrives at the emergency department reporting new‑onset chest pressure that began at rest and has not resolved. The client denies radiation of pain but states, “This feels different from my usual discomfort.” The ECG shows no ST‑segment elevation. The provider orders cardiac biomarkers to further evaluate the cause of the symptoms. Which of the following would best differentiate unstable angina from a non–ST‑elevation myocardial infarction (NSTEMI)?