Cardiac Tamponade Is Suspected in a Patient Who Has Acute

Cardiac tamponade is suspected in a patient who has acute pericarditis.To assess for the presence of pulsus paradoxus,what should the nurse do?

A) Subtract one third of the diastolic BP from the systolic BP.
B) Auscultate for a pericardial friction rub that increases in volume during inspiration.
C) Evaluate the rhythm of the pulse in relation to the patient's inspiration and expiration.
D) Note the first Korotkoff sound occurring during both inspiration and expiration while deflating the blood pressure cuff.