Certified EkG technician (CET) Practice Exam

During a third-degree AV block, what should the technician be vigilant for?

1. Signs of stroke

2. Signs of decreased cardiac output

3. Increased blood pressure

4. Frequent PVCs

The correct answer is: Signs of decreased cardiac output

During a third-degree AV block, it is critical for the technician to monitor for signs of decreased cardiac output. This condition, also known as complete heart block, occurs when the electrical signals between the atria and ventricles are completely blocked. As a result, the atria and ventricles beat independently, which can lead to a significant decrease in the heart's efficiency to pump blood. When there is a disruption in the normal rhythm and conduction of impulses, the heart may not be able to maintain an adequate supply of blood to meet the body's demands. This can manifest as symptoms such as fatigue, dizziness, shortness of breath, or syncope (loss of consciousness). The technician must be vigilant in observing these signs because impaired cardiac function can quickly lead to serious complications. Monitoring for decreased cardiac output is vital to ensure appropriate intervention and management are initiated as necessary. In contrast, while signs of stroke, increased blood pressure, and frequent PVCs may also be concerning in various contexts, they are not the immediate priority in the context of a third-degree AV block. The focus should primarily be on the heart's ability to effectively pump blood and maintain hemodynamic stability, which is directly affected by this type of block.