Aclient returns from a cardiac catheterization procedure and is to remain in the supine position for 4 hours with the affected leg straight. what are these measures intended to prevent?

These measures intend to prevent bleeding at the arterial puncture site.

Explanation:

Cardiac catheterization is a procedure in which a long tube (a catheter) is introduced in an artery or vein to reach the heart and diagnose or treat different cardiac diseases. After this procedure is done, bed rest with immobilization of the extremity in which the catheter was inserted is mandatory, as this position promotes coagulation and healing, and prevents bleeding at the site in which the blood vessel was punctured.