Which of the following is an absolute contraindication to pharmacologic stress testing?

• A. Bronchospasm
• B. Large AAA
• C. Advanced AV block
• D. Hypotension

Answer: (D)

The main concept here is safety in pharmacologic stress testing. An absolute contraindication means the test would pose an immediate, unacceptable risk to the patient, so it must be avoided.

Hypotension is an absolute contraindication because pharmacologic stress tests use agents that dilate vessels and lower systemic vascular resistance. If the patient is already hypotensive, these agents can cause the blood pressure to fall further, risking inadequate organ perfusion, syncope, or ischemia during the test. That risk is not compatible with a safe stress test, so hypotension blocks the test from being performed.

Bronchospasm is a significant concern with certain vasodilators like adenosine, since it can trigger bronchoconstriction in susceptible individuals (e.g., asthma or COPD). However, this is treated as a precaution or relative contraindication depending on the agent used and the patient's condition, rather than an absolute one in all cases.

A large abdominal aortic aneurysm raises safety questions but is not universally an absolute barrier to pharmacologic testing; the decision depends on individual risk assessment and the chosen agent.

Advanced AV block is a conduction issue that can complicate certain pharmacologic agents, but its status as absolute or relative depends on the agent and presence of pacing. It is not categorically absolute in every scenario.

So, the reason hypotension is the best answer is that already-low blood pressure makes the core effect of pharmacologic stress testing harmful, not just potentially uncomfortable.