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Review Question - QID 211556

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QID 211556 (Type "211556" in App Search)
A 35-year-old male presents to the emergency department following a motorcycle accident. On initial examination in the emergency department, he is found to have a left flail arm and multiple other injuries. There is a concern for a brachial plexus injury. What examination findings would support a diagnosis of a pre-ganglionic injury?