![]() If surgical decompression is planned, electrodiagnostic studies should be obtained to determine severity and surgical prognosis. Although patients with typical symptoms and signs of carpal tunnel syndrome do not need additional testing, ultrasonography and electrodiagnostic studies are useful to confirm the diagnosis in atypical cases and rule out other causes. Additional clues include positive physical examination findings, such as the flick sign, Phalen maneuver, and median nerve compression test. ![]() Classically, patients with the condition experience pain and paresthesias in the distribution of the median nerve, which includes the palmar aspect of the thumb, index and middle fingers, and radial half of the ring finger. Carpal tunnel syndrome, the most common entrapment neuropathy of the upper extremity, is caused by compression of the median nerve as it travels through the carpal tunnel.
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