A patient with suspected arterial thoracic outlet syndrome presents with numbness, tingling, heaviness, coldness, and pallor. What should the physical therapist's next step be?

• A. Refer the patient back to the physician for possible arterial thoracic outlet syndrome
• B. Treat the patient's sensory deficits with desensitization techniques
• C. Strengthen the patient's hand intrinsic muscles
• D. Send the patient to the emergency room

Answer: (A)

Recognizing vascular red flags in thoracic outlet syndrome is essential. Numbness and tingling combined with coldness and pallor point to arterial insufficiency rather than a purely nerve-related issue. Arterial TOS can threaten limb viability and requires medical evaluation to confirm the diagnosis and guide treatment, which may include imaging and vascular care. Therefore, the best next step is to promptly refer the patient to a physician for possible arterial TOS rather than attempting PT-only interventions. If signs of acute limb ischemia were present (severe pain, absent pulses, rapid color change), emergency care would be necessary, but with these findings, medical referral is the appropriate course.