A device for recording a patient's ECG for 24 hours is called a/an:
A) stress test.
B) Holter monitor.
C) ultrasonograph.
D) MRI.
B
Explanation:
A) A stress test is done on a treadmill.
B) Correct.
C) An ultrasonograph machine uses sound waves to create an image of internal structures.
D) An MRI machine uses magnetism to create images of internal structures.
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