Working... Menu

L-arginine to Reduce Sympathetic Nerve Activity in CKD Patients

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03982160
Recruitment Status : Recruiting
First Posted : June 11, 2019
Last Update Posted : June 11, 2019
Information provided by (Responsible Party):
Paul Fadel, The University of Texas at Arlington

Brief Summary:

Chronic kidney disease (CKD) is associated with a higher risk of cardiovascular disease and death. An overactive sympathetic nervous system in CKD patients is one of the major mechanisms increasing the cardiovascular risks in this patient population. A potential signal driving sympathetic nerve activity (SNA) involves accumulation of the endogenous nitric oxide synthase (NOS) inhibitor asymmetric dimethylarginine (ADMA). ADMA is elevated in CKD and is a strong, independent predictor of future cardiovascular events in these patients. .

The goal of this study is to determine whether overcoming the accumulation of endogenous ADMA with acute L-arginine infusion reduces SNA in CKD patients.

Condition or disease Intervention/treatment Phase
Chronic Kidney Disease Drug: L-Arginine Other: Placebo Phase 4

Detailed Description:
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.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 15 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Intervention Model Description: This will be a randomize, saline-controlled crossover design study
Masking: Single (Participant)
Masking Description: Subjects will receive systemic intravenous infusion of L-arginine or saline for 30 minutes in a randomized order. The randomization will be carried out by research personnel.
Primary Purpose: Basic Science
Official Title: Role of Decreased Nitric Oxide in the Tonic Elevation of Resting Sympathetic Nerve Activity in Chronic Kidney Disease Patients
Actual Study Start Date : February 1, 2018
Estimated Primary Completion Date : September 30, 2020
Estimated Study Completion Date : September 30, 2020

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Kidney Diseases

Arm Intervention/treatment
Experimental: L-arginine
Intravenous infusion of L-arginine (250-350 mg/kg) will be performed for 30 minutes.
Drug: L-Arginine
Arginine Hydrochloride 60% concentration injection 15 g in 25 mL, contains arginine hydrochloride 600 mg/mL in water for injections to 25 mL.

Placebo Comparator: Saline
Saline will be infused for 30 minutes
Other: Placebo

Primary Outcome Measures :
  1. Muscle sympathetic nerve activity (MSNA) will be reduced after L-arginine infusion [ Time Frame: 30 minutes ]
    Multiunit postganglionic MSNA will be recorded using standard microneurographic techniques. Briefly, a unipolar tungsten microelectrode will be inserted into muscle fascicles of the peroneal nerve near the fibular head of the right leg. Neural signals will be amplified, filtered (bandwidth, 700-2,000 Hz), rectified, and integrated (time constant, 0.1 s) to obtain mean voltage neurograms (University of Iowa Bioengineering, Iowa City, IA).

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   35 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • CKD patients classified as Stage 3 and 4 of National Kidney Foundation Classification with estimated glomerular filtration rate (GFR) between 15 and 59 mL/min/1.73 m2 according to the Modification of Diet in Renal Disease (MDRD) formula based on serum creatinine, age, gender, and race.
  • Men and women 35 to 75 years of age

Exclusion Criteria:

  • myocardial infarction
  • heart failure
  • anemia (hemoglobin <8 g/dl)
  • cancer with current treatment
  • previous organ transplantation
  • immunosuppressant therapy
  • human immunodeficiency virus infection
  • pregnancy and/or lactating
  • current tobacco use
  • taking menopausal drugs (estradiol)
  • treatment for diabetic neuropathy
  • resting heart rate ≥ 100 bpm and
  • systolic blood pressure ≤ 90 mmHg

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03982160

Layout table for location contacts
Contact: Paul J Fadel, PhD 8172724653

Layout table for location information
United States, Delaware
University of Delaware Recruiting
Newark, Delaware, United States, 19716
Contact: David Edwards, PhD   
United States, Texas
UT Southwestern Recruiting
Dallas, Texas, United States, 75390
Contact: Robert Toto, MD    214-648-2600   
Sponsors and Collaborators
The University of Texas at Arlington
Layout table for investigator information
Principal Investigator: Paul J Fadel, PhD University of Texas at Arlington

Layout table for additonal information
Responsible Party: Paul Fadel, Professor, The University of Texas at Arlington Identifier: NCT03982160     History of Changes
Other Study ID Numbers: CKD-IRB-2016-0069
First Posted: June 11, 2019    Key Record Dates
Last Update Posted: June 11, 2019
Last Verified: June 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Layout table for additional information
Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Paul Fadel, The University of Texas at Arlington:
blood pressure

Additional relevant MeSH terms:
Layout table for MeSH terms
Kidney Diseases
Renal Insufficiency, Chronic
Urologic Diseases
Renal Insufficiency