a 27-year-old software specialist presents to your office for evaluation of numbness and pain in his fingers. he has noticed that the numbness increases as the day goes on; at first he noticed it only at the end of the day, but now it is present upon awakening. it is present in both of his hands. the pain started several months ago and is not relieved by over the counter analgesics. the patient's family history is significant for hypertension and cerebrovascular disease. on physical examination, his blood pressure is 110/70 mm hg and his thenar eminence is atrophic. which tests would you perform to confirm your initial hypothesis of carpal tunnel syndrome