Which of the following defines a stress test?
A. Insertion of a catheter into the blood vessels into the heart
B. Examination of the structure and function of the heart through the use of reflected sound waves
C. Measurement of the patient's response to an increasing workload on the heart using an ECG
D. Recording of ECG readings over a specific period of time, usually 24 hours or more
E. The x-ray examination of an artery after injection of a contrast medium
Answer: C
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