Role of Decreased Nitric Oxide in the Tonic Elevation of Resting Sympathetic Nerve Activity in Chronic Kidney Disease Patients

The central hypothesis is that accumulation of ADMA constitutes a major mechanism for the sympathetic overactivity and hypertension in patients with CKD. In this study, the investigators will determine if restoration of NO production with the infusion of L-arginine reduces SNA and blood pressure. On the experimental day, CKD patients will arrive at the laboratory fasted with no morning meds, will refrain from caffeine for 12 hours, and alcohol and physical activity for 24 hours. The collaborating physician Dr. Ashfaq Siddiqui will review subject medications and advise regarding any withholding of medications. If Dr. Siddiqui deems that a medication should not be withheld the investigators will proceed with the patient taking the medication. Prior to any screening/testing, all experimental measurements and procedures will be explained in detail and subjects will provide written, informed consent. A medical health history questionnaire will be filled out. Women of child-bearing age will provide a urine sample for a pregnancy testing prior to any study procedures. The research nurse will place an intravenous catheter in antecubital or hand vein. Subjects will be familiarized with the experimental measures and procedures prior to actual testing. Following this, the subjects will be instrumented with ECG leads, an arterial blood pressure (BP) finger-cuff (Finometer), an arterial BP upper-arm cuff for intermittent absolute BP values, and a strain gauge pneumobelt placed around the abdomen to monitor respiratory excursions. After measuring blood pressure and pulse wave velocity using applanation tonometry, a Doppler ultrasound probe will then be positioned for beat-to-beat measurements of blood velocity and artery diameter and flow-mediated dilation (FMD) will be performed. After this, continuous recording of muscle sympathetic nerve activity (MSNA) will be obtained from the peroneal nerve of the leg, as described below. Following all instrumentation, 25 minutes of resting baseline data (continuous heart rate, MSNA, BP, respiration, and blood flow) will be collected. A blood sample will then be obtained from the intravenous catheter. Next, systemic intravenous infusion of L-arginine, at a dose of 250-350 mg/kg, or saline will be performed for 30 minutes in a randomized order. During each infusion, cardiovascular measurements (heart rate, BP and MSNA) will be recorded continuously and an FMD and cold pressor test performed. The blood draw will be repeated after L-arginine infusion. A 15-minute recovery period will be provided between infusions. Thus, for this study, patients will visit the lab once and the visit will take approximately 5 hours.