Tuesday, September 4, 2018

Repeated USMLE Questions Step 1- 230

A 45-year-old man working as a secretary visits the doctor's clinic complaining of tingling and numbness in his hands. Upon conducting a physical examination, the doctor finds that the patient also has decreased sensation in all his fingers, except for the fifth digit. Keeping these in mind, which of the following muscles is usually weakened in patients suffering from this condition?

A- Adductor pollicis

B- Dorsal interossei

C- Lumbricals

D- Opponens pollicis


The patient is suffering from carpal tunnel syndrome. This condition occurs in those who work for long hours with repetitive hand motions, such as typing on a computer. In carpal tunnel, the median nerve gets compressed, which leads to a reduced sensation on the first three as well as one-half digits. There is also a loss of strength in the thumb due to reduced strength of the opponens pollicis and the abductor pollicis brevis.

The correct answer is D

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