Final answer:
The most common symptom of myocardial ischemia and infarction is retrosternal chest pain, which may be accompanied by difficulty breathing, sweating, nausea, and irregular heartbeat.
Step-by-step explanation:
The most common symptom of myocardial ischemia and infarction is retrosternal chest pain. This pain is often described as a pressure or squeezing sensation in the chest and can radiate down the left arm in males. Other symptoms that may be present include difficulty breathing, sweating, nausea, and irregular heartbeat.
It is important to note that not all individuals will experience the same symptoms, and some may not have any symptoms at all. Differential diagnosis is critical to distinguish myocardial ischemia and infarction from other medical conditions.