Which of the following is a symptom of myocardial infarction?

Chest pressure is a classic symptom of myocardial infarction, commonly known as a heart attack. During a myocardial infarction, the blood supply to part of the heart muscle becomes blocked, leading to ischemia and cell death. The sensation of chest pressure is often described as tightness, squeezing, or a heavy weight on the chest, which is indicative of the heart's distress and an urgent medical condition.

This symptom is part of the broader presentation of angina or heart attack symptoms, which may also include radiating pain to the arms, jaw, or back, shortness of breath, sweating, and nausea. The sensation can be perplexing, as it may not always be localized pain but rather a generalized discomfort in the chest area.

Other symptoms listed, such as palpitations, abdominal pain, or blurred vision, can occur in various medical conditions but are not characteristic of myocardial infarction. Palpitations might indicate arrhythmias or anxiety, while abdominal pain could derive from gastrointestinal issues or referred pain. Blurred vision is not typically a direct symptom associated with myocardial infarction, although it may appear in certain severe situations. In this case, chest pressure is the most specific and widely recognized manifestation of an impending heart attack.