Florida State Paramedic Practice Exam

What is one of the expected effects of using Epinephrine during cardiac emergencies?

1. Decreased heart rate

2. Increased coronary artery dilation

3. Increased myocardial oxygen demand

4. Decreased fluid retention

The correct answer is: Increased myocardial oxygen demand

In the context of cardiac emergencies, the use of Epinephrine is associated with increased myocardial oxygen demand. This occurs because Epinephrine acts as a potent vasoconstrictor and stimulates both alpha and beta-adrenergic receptors. When it stimulates beta-1 receptors in the heart, it increases heart rate and contractility, leading to a greater workload on the heart. This elevated workload results in a higher demand for oxygen by the myocardial tissue, which is critical to understand in managing patients experiencing cardiac events. The increased myocardial oxygen demand can have significant implications during resuscitation and treatment, as the heart may already be compromised in its ability to supply oxygen due to potential ischemia or other underlying conditions. Being aware of this effect helps paramedics and healthcare providers balance the immediate benefits of using Epinephrine with the overall management of the patient's cardiac health. In contrast, the other options fail to accurately reflect the physiological influences of Epinephrine in this setting, such as decreased heart rate or decreased fluid retention, which are not effects associated with this medication in cardiac emergencies.