During examination of a patient's extremities, you press firmly for a brief period on a fingernail
You observe that it takes approximately 5 sec for the color to return to the nail bed. This finding is most consistent with which of the following?
a. Reduction in cardiac output or poor pe-ripheral perfusion
b. Presence of a disorder causing chronic hypoxemia
c. Reduction in venous return to the right side of the heart
d. Presence of a disorder causing systemic hypertension
ANS: A
When cardiac output is reduced and digital perfusion is poor, capillary refill is slow, taking sev-eral seconds to complete. In healthy individuals with good cardiac output and digital perfusion, capillary refill time is less than 3 sec.
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