Lumbar sympathetic blocks are performed in the office. Patients are required to check in 30 minutes prior to their scheduled appointment time. Once taken back to the preparation area, a small IV catheter will be placed in your hand or arm. This catheter may be used to administer light sedation for the procedure. When taken to the procedure room, you will be placed on your stomach with a pillow under your hips. Blood pressure and oxygen saturation monitors will be applied. The injection sites will be cleansed with an antiseptic solution and draped in a sterile manner. Using a small, thin needle, local anesthetic is injected to numb the skin and deep tissue, which may feel like a stinging and/or burning sensation. Assisted by fluoroscopy (X-ray), the physician is able to correctly place the needle and inject local anesthetic around the sympathetic nerves. You may experience a pressure sensation as the medication is injected. Following the procedure, you may feel a warm sensation in your lower extremities and an absence or decrease in pain. You may also experience weakness or numbness in the leg, which is temporary. The procedure will take approximately 15-30 minutes to complete. If you respond well to the first injection, a series of additional injections may be indicated.