Final answer:
Four signs of acute myocardial infarction in the left ventricle include severe chest pain radiating to the left side, nausea and vomiting, irregular heartbeat, and difficulty breathing. An ECG and elevated cardiac enzyme levels can also indicate left ventricular myocardial infarction.
Step-by-step explanation:
Four clinical signs that suggest an acute myocardial infarction (MI) has occurred in the left ventricle and not in the right ventricle are typical presentations of MI, such as sudden, severe chest pain often described as pressure, fullness, or a squeezing pain in the center of the chest that may spread to the neck, shoulder, or arms, particularly to the left side (in males). Additionally, nausea and vomiting, irregular heartbeat or palpitations, and difficulty breathing are indicative signs.
An electrocardiogram (ECG) can reveal changes specific to infarction in the left ventricle, such as ST elevation and abnormal Q waves in the leads overlying the left ventricle. Blood tests may show elevated levels of cardiac enzymes such as creatine kinase MB and cardiac troponin, indicative of myocardial cell death.