**Core Concept**
Complete AV nodal block is a condition where there is a total disruption of electrical conduction between the atria and ventricles, resulting in an abnormal heart rhythm. This occurs due to a blockage in the **AV node**, which is a critical structure in the heart's electrical conduction system. The **AV node** acts as a relay station, delaying the electrical signal from the atria to the ventricles.

**Why the Correct Answer is Right**
Since the question is incomplete, let's assume the correct answer choice is related to the effect of complete AV nodal block on heart rhythm. In complete AV nodal block, the atria and ventricles beat independently, resulting in an abnormal heart rhythm. The ventricles are often paced by an **escape rhythm**, which is typically slower than the normal heart rate.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the actual option text, it's difficult to provide a specific reason why this choice is incorrect.
**Option B:** Similarly, without the text, we can't determine why this option is wrong.
**Option C:** This option would be incorrect if it suggested that complete AV block results in a normal heart rhythm.
**Option D:** This choice would be wrong if it implied that complete AV block has no effect on the heart's electrical conduction.

**Clinical Pearl / High-Yield Fact**
Complete AV nodal block can result in significant **bradycardia**, which may lead to symptoms such as dizziness, fainting, and shortness of breath. It's essential to recognize this condition and provide appropriate treatment, such as pacing, to restore a normal heart rhythm.

**Correct Answer:** Complete AV nodal block results in an abnormal heart rhythm, often with a slower than normal ventricular rate.