To distinguish between a respiratory friction rub and cardiac friction rub, ask the patient to:
a. hold the breath.
b. lean forward.
c. say "99" while you palpate the anterior chest.
d. identify the location of the pain.
A
A respiratory friction rub results when inflamed pleura rub against each other during the respira-tory cycle; if the breath is held, the rub stops.
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