JSAL Anesthesia Practice Test

What does capillary refill time (CRT) indicate during anesthesia?

It reflects tissue perfusion; Prolonged CRT indicates poor perfusion or shock It measures oxygen saturation in peripheral tissues It indicates airway patency It is irrelevant during anesthesia

Correct Answer:

It reflects tissue perfusion; Prolonged CRT indicates poor perfusion or shock

Explanation:

Capillary refill time reflects tissue perfusion. It’s a quick bedside check where you press on a mucous membrane and watch how fast color returns; a rapid refill means perfusion is likely adequate, while a prolonged refill suggests reduced perfusion. In anesthesia, a slower CRT points to potential problems with circulating blood flow, such as hypovolemia, decreased cardiac output, or peripheral vasoconstriction from drugs or cold environment, which can indicate shock or impending instability. It doesn’t measure oxygen saturation (that’s what pulse oximetry does) and it isn’t a measure of airway patency. Use CRT along with other signs like heart rate, blood pressure, mucous membrane color, and urine output to assess overall perfusion status.

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