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A patient with a very large upper arm has the blood pressure taken with a standard adult cuff that is clearly too small. How will this affect the reading, and why?
A
It will read falsely high, because a bladder that is too narrow requires extra pressure to compress the artery
B
It will affect only the diastolic value; the systolic value stays accurate
C
It will read falsely low, because the cuff cannot fully compress the artery
D
It will not affect the reading as long as the stethoscope is placed correctly