When assessing a patient's cardiovascular system, the nurse notes a high pitched scratchy sound at the apex of the heart.The nurse recognizes this as rubbing between the two walls of the sac surrounding and protecting the heart, called the:

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The pericardium is a tough, fibrous, double-walled sac that surrounds and protects the heart.It has two layers that contain a few millilitres of serous pericardial fluid.Inflammation of the precordium gives rise to a friction rub.The sound is high pitched and scratchy, like sandpaper being rubbed.

When Assessing a Patient's Cardiovascular System, the Nurse Notes a High