Study of Sodium Bicarbonate in Kidney Transplant Recipients

This study has been completed.
Information provided by (Responsible Party):
Kraphael, University of Utah Identifier:
First received: October 15, 2010
Last updated: August 17, 2015
Last verified: August 2015
About half of transplanted kidneys continue to work ten years after the time of transplant. The purpose of this study is to test whether oral sodium bicarbonate might improve the long-term function of a transplanted kidney.

Condition Intervention
Kidney Transplantation
Drug: Sodium bicarbonate

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Randomized Trial of Sodium Bicarbonate in Renal Transplant Recipients With Low-normal Serum Bicarbonate Levels

Resource links provided by NLM:

Further study details as provided by University of Utah:

Primary Outcome Measures:
  • Urinary transforming growth factor-beta1 [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    This is considered a surrogate marker of chronic allograft nephropathy (tubulointerstitial fibrosis).

Secondary Outcome Measures:
  • urinary ammonia excretion [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    a component of urinary acid excretion

Enrollment: 29
Study Start Date: November 2010
Study Completion Date: November 2012
Primary Completion Date: November 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Sodium bicarbonate
This group will receive oral sodium bicarbonate 650mg three times daily for 6 months.
Drug: Sodium bicarbonate
Sodium bicarbonate 650mg by mouth three times daily for 6 months.
No Intervention: Control
This group will not receive any sodium bicarbonate.

Detailed Description:

Renal allograft survival ten years after transplant is only about 50%. In people with non-transplant chronic kidney disease (CKD), sodium bicarbonate treatment seems to delay progressive decline in kidney function in those with low serum bicarbonate levels (metabolic acidosis). This may be because sodium bicarbonate reduces renal ammonia production and hence fibrosis. Observational evidence suggests that people with CKD and low-normal serum bicarbonate levels might also benefit from sodium bicarbonate treatment. The benefit of sodium bicarbonate treatment on long-term renal allograft survival is not known. The purpose of this study is to determine the effect of oral sodium bicarbonate on:

  • urinary transforming growth factor-beta1, a marker of renal fibrosis
  • urinary ammonia excretion.

Ages Eligible for Study:   21 Years to 75 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Renal transplant recipients
  • Age 21-75 years
  • Six months since the time of the most recent transplant
  • Serum bicarbonate 20-28mM on the two most recent serum measures with the last six months
  • Stable creatinine

Exclusion Criteria:

  • Systolic blood pressure > 140mmHg
  • Diastolic blood pressure > 90mmHg
  • Known ejection fraction <50%
  • Clinical diagnosis of heart failure
  • Use of >3 antihypertensive agents
  • > 1+ edema
  • Use of alkali in the preceding 3 months
  • History of noncompliance with clinic visits
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Please refer to this study by its identifier: NCT01225796

United States, Utah
University of Utah
Salt Lake City, Utah, United States, 84132
Sponsors and Collaborators
University of Utah
Principal Investigator: Kalani L Raphael, MD University of Utah