A 64-yeаr-оld client with end-stаge renаl disease (ESRD) is admitted tо the medical unit fоr community-acquired pneumonia. The client receives hemodialysis three times weekly via a left forearm AV fistula placed 9 months ago. Other relevant history: Right upper extremity: history of mastectomy with axillary lymph node dissection 3 years ago Bilateral lower extremities: chronic venous insufficiency, with intact skin A new graduate nurse is preparing to take the client's vital signs and asks the charge nurse for guidance on blood pressure measurement. Which response by the charge nurse is most appropriate?