Before performing a digital block, what physical exam should you perform?

Before performing a digital block, what physical exam should you perform?

• A. Check 2-point discrimination and compare to the contralateral finger
• B. Assess grip strength
• C. Check proprioception
• D. Check temperature sensation

Answer: (A)

Testing two-point discrimination on the fingertip, and comparing it to the opposite finger, gives a precise baseline of fine touch that is most sensitive to a digital nerve block. The fingertip relies on small, highly localized sensory fibers, and two-point discrimination shows how well the patient can distinguish separate points before anesthesia. Using the contralateral finger as a reference accounts for individual variability in sensation and helps you confirm that a change is due to the block itself. Grip strength, proprioception, and temperature testing assess different modalities (motor function, sense of position, and crude temperature) that are less informative for verifying or planning a digital nerve block. Thus, the best pre-block exam is documenting baseline fine touch with two-point discrimination and comparing to the other finger.

Testing two-point discrimination on the fingertip, and comparing it to the opposite finger, gives a precise baseline of fine touch that is most sensitive to a digital nerve block. The fingertip relies on small, highly localized sensory fibers, and two-point discrimination shows how well the patient can distinguish separate points before anesthesia. Using the contralateral finger as a reference accounts for individual variability in sensation and helps you confirm that a change is due to the block itself.

Grip strength, proprioception, and temperature testing assess different modalities (motor function, sense of position, and crude temperature) that are less informative for verifying or planning a digital nerve block. Thus, the best pre-block exam is documenting baseline fine touch with two-point discrimination and comparing to the other finger.