Large protruding arm veins in an otherwise healthy adult can be difficult to cannulate because they often
A. constrict in response to insertion of the IV catheter.
B. roll from side to side during the cannulation attempt.
C. are covered by thick skin that bends the IV catheter.
D. rupture spontaneously when punctured with the needle
Answer: B. roll from side to side during the cannulation attempt.
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