A 33 year old male presents after cutting his left index finger with a kitchen knife.  You are able to control the bleeding, but the digit appears cool and dusky.  Is there significant arterial involvement? Could this benefit from a replant?

TIP

Place a pulse oximeter on the affected digit and obtain a reading

Place a pulse oximeter on the same digit of the unaffected hand and obtain a reading.

If the pulse oximeter on the affected digit reads less than 85% (and the unaffected hand is normal), there is likely significant arterial injury, and this person may need replantation to fix the defect.