American Association of Critical-Care Nurses (AACN) Certification Practice Test

Which symptom might indicate the presence of cardiac ischemia?

1. Persistent cough

2. Nausea without chest pain

3. Chest pain relieved by rest

4. ST depressions on EKG

The correct answer is: ST depressions on EKG

The presence of ST depressions on an electrocardiogram (EKG) is a significant indicator of cardiac ischemia. Ischemia refers to reduced blood flow to the heart muscle, leading to a lack of oxygen and can result in damage if not addressed promptly. ST depressions typically occur when there is myocardial ischemia, particularly during stress or exertion, and they suggest that the heart is not receiving enough blood supply during periods of increased demand. This is often seen in conditions like stable angina or during stress testing. While symptoms like a persistent cough, nausea without chest pain, or chest pain relieved by rest may be related to various health issues, they are not specific indicators of cardiac ischemia in the same way ST depressions are on an EKG. Thus, the identification of ST depressions is critical in diagnosing and managing potential cardiac ischemia effectively.