Which of the following is NOT a symptom of myocardial infarction?

Myocardial infarction, commonly known as a heart attack, presents with a range of symptoms that are primarily related to the heart's reduced ability to pump effectively due to blockage in the coronary arteries. Symptoms typically include chest discomfort, shortness of breath, and nausea, among others.

High blood pressure, while possibly resulting from the stress and physiological changes during a heart attack, is not classified as a direct symptom of a myocardial infarction itself. Instead, it can often be a pre-existing condition or an indirect outcome of the body's response to the heart attack. The hallmark symptoms usually focus more on immediate, subjective experiences of the patient, which makes options related to discomfort, breathlessness, and feelings of nausea more pertinent.

Thus, the correct answer identifies high blood pressure as not being a direct symptom of this acute event, highlighting the importance of recognizing classic signs of a myocardial infarction for diagnosis and timely intervention.