In diabetes, neuropathy may affect heart rate responses during exercise testing. What is a potential consequence for interpreting the test results?

In diabetes, neuropathy may affect heart rate responses during exercise testing. What is a potential consequence for interpreting the test results?

• A. Heart rate will always be higher during testing.
• B. Chest pain perception becomes more intense.
• C. The test may underestimate myocardial ischaemia risk.
• D. Exercise duration increases.

Answer: (C)

Diabetes-related autonomic neuropathy can blunt the heart rate response to exercise, a problem known as chronotropic incompetence. Because the heart rate doesn’t rise as much as expected for the level of workload, the test may not provoke the same level of myocardial oxygen demand needed to reveal ischemia. As a result, ischemic changes on the test or symptoms may be absent or less apparent even if coronary perfusion is compromised, leading to an underestimation of myocardial ischemia risk. Clinicians may rely more on imaging-based stress measures or other indicators and consider interpreting results with the understanding that a blunted heart rate response can mask underlying ischemia.

Diabetes-related autonomic neuropathy can blunt the heart rate response to exercise, a problem known as chronotropic incompetence. Because the heart rate doesn’t rise as much as expected for the level of workload, the test may not provoke the same level of myocardial oxygen demand needed to reveal ischemia. As a result, ischemic changes on the test or symptoms may be absent or less apparent even if coronary perfusion is compromised, leading to an underestimation of myocardial ischemia risk. Clinicians may rely more on imaging-based stress measures or other indicators and consider interpreting results with the understanding that a blunted heart rate response can mask underlying ischemia.