NCT07688434Not yet recruiting
Pilot Trial of Oral Sodium Bicarbonate Versus Higher Dialysate Bicarbonate in Hemodialysis Patients With Metabolic Acidosis
Comparative Pilot Trial of Oral Sodium Bicarbonate Versus Increased Dialysate Bicarbonate in Chronic Hemodialysis Patients With Metabolic Acidosis
Source: ClinicalTrials.gov · Last updated 21 Jul 2026
Brief summary (registry, in English)
Metabolic acidosis is frequent in chronic hemodialysis patients and is associated with adverse clinical outcomes. Two commonly used strategies to correct acidosis are oral sodium bicarbonate supplementation and increasing the bicarbonate concentration of the dialysate, but their comparative effectiveness and tolerance in routine care remain uncertain. This pilot, prospective, randomized, open-label, single-center trial will compare oral sodium bicarbonate versus higher dialysate bicarbonate in chronic hemodialysis patients with metabolic acidosis, using predialysis plasma bicarbonate concentrations, so-called "reserves alcalines" or "alkaline reserves" in local laboratory reports, as a pragmatic marker of acid-base status. Approximately 30 acidotic patients (serum bicarbonate \< 22 mmol/L) will be randomized 1:1 to receive either oral sodium bicarbonate or an increase in dialysate bicarbonate for 6 weeks. An additional non-acidotic observational group will provide descriptive reference data. The primary outcome is the change in predialysis serum bicarbonate from baseline (Day 0) to Day 42 between the two randomized arms. Secondary outcomes include the proportion of patients reaching target serum bicarbonate levels, the weekly kinetics of correction, dialysis adequacy (Kt/V and online clearance monitoring), intradialytic tolerance (blood pressure, cramps, hypotension, symptoms), sodium-related safety (natremia, interdialytic weight gain), and the effects of acidosis correction on nutritional and bone-mineral metabolism, including changes in serum albumin, calcium, phosphorus, and parathyroid hormone (PTH). Feasibility indicators such as recruitment, retention, adherence to treatment and dialysate adjustment, and data completeness will also be described to inform the design of a larger definitive trial.
- Status (registry)
- Not yet recruiting
- Study type
- Interventional
- Enrollment
- 37 (estimated)
- First submitted
- 21 Jun 2026
- Start date
- Jul 2026
- Primary completion date
- Sept 2026
- Lead sponsor
- University of Sfax
- Diseases
- Chronic kidney disease
- NCT number
- NCT07688434
What you commit to
- Study type: Interventional
- Planned participants: 37
- From Jul 2026 to the primary completion date, Sept 2026
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Recent hemodynamic instability (e.g., repeated intradialytic hypotension or unstable blood pressure in the previous weeks).
- Major change in dialysis prescription in the 2 weeks prior to inclusion (e.g., change in dialysis schedule, duration, or dialysate composition outside the study protocol).
Other illness
- Recent hospitalization for an acute condition.
- Acute infection or major intercurrent acute event at the time of screening.
- Severe digestive disorders limiting oral intake (e.g., persistent vomiting, severe malabsorption, or any condition preventing safe oral Bicardis administration).
- Any condition that, in the investigator's judgment, would preclude safe participation or interfere with study procedures (e.g., very limited life expectancy, inability to attend scheduled visits).
Lab values
- Known hypernatremia or high risk of uncontrolled sodium and fluid overload (as judged by the investigator).
Other
- Severe uncontrolled hypercalcemia or hypocalcemia.
- Refusal to participate or inability to provide written informed consent.
Who the study is looking for
- Age ≥ 18 years.
- Chronic hemodialysis for at least 3 months.
- Stable hemodialysis prescription: 3 times a week, high-flux dialyzers, no major change in dialysis prescription in the previous weeks.
- Predialysis low "alkaline reserves" (serum bicarbonate concentration) according to the operational threshold used in the unit (e.g., "alkaline reserves" \< 22 mmol/L), consistent with KDIGO 2017 definition of metabolic acidosis.
- Ability to give written informed consent.
- For the observational group:
- Age ≥ 18 years.
- Chronic hemodialysis for at least 3 months.
- Hemodialysis 3 times a week, high-flux dialyzers.
- Predialysis "alkaline reserves" considered stable and within the locally defined normal range (≥ 22mmol/L).
- Ability to give written informed consent.
Age in the registry: 18 years to - · Sex: All · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Social security fund polyclinic Coordinator of this site? Confirm its status | Sfax | Tunisia | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.