Third-degree AV block without pacing is an absolute contraindication. Which option states this?

Third-degree AV block without pacing is an absolute contraindication. Which option states this?

• A. First-degree AV block with normal rhythm.
• B. Third-degree AV block without pacing.
• C. Second-degree AV block Type II with symptoms.
• D. Right bundle branch block.

Answer: (B)

In a third-degree AV block, there is complete dissociation between the atria and ventricles—the impulses from the atria do not reach the ventricles. The ventricles then fire on their own slow escape rhythm, which often leads to significant bradycardia and reduced cardiac output. Because there is no reliable conduction, any plan that depends on intact AV conduction is unsafe without pacing support. That’s why the statement describing “third-degree AV block without pacing” is the one that matches this concept and is considered an absolute contraindication to proceeding without providing pacing. The other choices describe blocks or conditions that do not involve complete AV dissociation and are not described as absolute contraindications in this context.

In a third-degree AV block, there is complete dissociation between the atria and ventricles—the impulses from the atria do not reach the ventricles. The ventricles then fire on their own slow escape rhythm, which often leads to significant bradycardia and reduced cardiac output. Because there is no reliable conduction, any plan that depends on intact AV conduction is unsafe without pacing support. That’s why the statement describing “third-degree AV block without pacing” is the one that matches this concept and is considered an absolute contraindication to proceeding without providing pacing. The other choices describe blocks or conditions that do not involve complete AV dissociation and are not described as absolute contraindications in this context.