A 24-year-old woman notices pain in her left arm, made worse with use. She also has fatigue, fever, night sweats, and arthralgias. On examination, there are no palpable lymph nodes, and the joints and muscle strength are normal. The left radial pulse is absent, and there is a bruit over the left subclavian and common carotid arteries. Preliminary laboratory investigations reveal an elevated ESR and mild anemia. Which of the following vascular findings is most likely to be found in her?