Final answer:
On the neurological exam of a 72-year-old patient with Parkinson's disease, you would expect to find a tremor at rest, but not one-sided facial paralysis.
Step-by-step explanation:
For a 72-year-old patient with a history of Parkinson's disease admitted to the hospital for shoulder surgery, on a neurological exam, you would primarily expect to find a tremor at rest, which is one of the defining motor symptoms of Parkinson's. This tremor typically occurs in a limb at rest and is most noticeable in the hands.
Parkinson's may also lead to muscle rigidity, slowness of movement (bradykinesia), and postural instability, but it does not typically cause one-sided facial paralysis, which could be seen in other neurological conditions such as a stroke. Therefore, the correct answer to what is expected to find on the neurological exam is a. Tremor at rest.