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Question:

Why are indwelling catheters secured or taped to a patient’s leg?

A So that any kind of trauma to the patient can be prevented.
Explaination

If the catheter is secured to the patient’s leg, this could prevent any kind of trauma to the patient, should the catheter accidentally be pulled.  A catheter is already fixed in the patient’s bladder with a balloon, so it cannot easily be dislodged. If the catheter is secured to the patient’s leg, any kind of trauma to the patient could be prevented, should the catheter accidentally be pulled.