One of these is not a symptom of acute coronary syndrome

The correct option is "No episodes of dyspnea".

Acute coronary syndrome (ACS) is a term used for any condition brought on by a sudden reduction or blockage of blood flow to the heart. Symptoms of ACS typically include chest pain or discomfort (unstable angina), and myocardial infarction (heart attack), which is classified based on electrocardiogram (ECG) changes into ST-segment elevation myocardial infarction (STEMI) or non-ST-segment elevation myocardial infarction (NSTEMI).

In addition to chest pain, associated symptoms frequently include shortness of breath (dyspnea), sweating (diaphoresis), nausea, and lightheadedness. Therefore, dyspnea (shortness of breath) is a common symptom of acute coronary syndrome, meaning that having "no episodes of dyspnea" is not a symptom of the condition. Instead, the presence of dyspnea is a characteristic finding in ACS patients.