Final answer:
A client with C7 quadriplegia is likely suffering from autonomic dysreflexia, with anticipated symptoms of hypertension and bradycardia in addition to the presented symptoms.
Step-by-step explanation:
A client with C7 quadriplegia who is flushed and anxious, complains of a pounding headache, and may likely experience other symptoms associated with autonomic dysreflexia, which is common in individuals with spinal cord injuries above the T6 level. For this clinical scenario, one would anticipate hypertension and bradycardia as additional symptoms. Autonomic dysreflexia is a condition in which there is a sudden and exaggerated autonomic response to stimuli, leading to severe hypertension and a reflexive slowing of the heart (bradycardia).