Which of the following correctly characterizes a symptom associated with NSTEMI?

Chest discomfort accompanied by nausea and vomiting is a well-recognized symptom associated with non-ST-segment elevation myocardial infarction (NSTEMI). NSTEMI is a type of acute coronary syndrome that often presents with a range of symptoms, and while chest pain is common, it may also present atypically. The accompanying symptoms such as nausea and vomiting can occur due to vagal stimulation or the body's response to stress and pain.

This option aligns with the clinical presentation seen in many patients experiencing NSTEMI, where the severity and nature of discomfort can vary significantly, and additional symptoms like gastrointestinal disturbance are common.

In contrast, severe chest pain without any other symptoms can occur, but it does not adequately describe the multifaceted nature of NSTEMI. Sustained asymptomatic ECG changes would not characterize NSTEMI, as the presence of symptoms, even if mild, is typically observed in this condition. Lastly, lightheadedness without any prior history may be an indication of various issues but does not specifically point to NSTEMI, where other more definitive symptoms are usually present.