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NCT Number: NCT07662889

Comparing Hemodiafiltration to Conventional Hemodialysis: Effects on Clinical and Biochemical Parameters

Chronic kidney disease may progress to end-stage renal disease, a stage in which the kidneys will no longer be able to adequately remove extra fluid and waste products from the body. Many patients with end-stage renal disease will require regular dialysis to survive. Conventional hemodialysis is the most commonly used dialysis technique and will mainly remove waste products through diffusion. Hemodiafiltration is another dialysis technique that will combine diffusion with convection and may help remove a wider range of waste substances from the blood.

This randomized clinical trial will compare hemodiafiltration with conventional hemodialysis in adult patients with end-stage renal disease who are already receiving maintenance dialysis. Eligible participants will be assigned by random allocation to either conventional hemodialysis or hemodiafiltration. Both treatments will be provided as part of routine dialysis care, and no experimental drug will be used.

The main purpose of the study will be to determine whether hemodiafiltration will lead to better fluid control compared with conventional hemodialysis. Fluid control will be assessed by measuring the average weight gained between dialysis sessions over a four-week period. The study will also compare selected blood test parameters between the two groups after one month, including hemoglobin, C-reactive protein, serum albumin, total cholesterol, serum calcium, serum phosphate, and intact parathyroid hormone.

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Key information

Conditions

End-Stage Kidney Disease (ESKD) Chronic Disease Chronic Kidney Disease (CKD) Disease Attributes Female Urogenital Diseases Female Urogenital Diseases and Pregnancy Complications Kidney Diseases Kidney Failure, Chronic Male Urogenital Diseases Pathologic Processes Pathological Conditions, Signs and Symptoms Renal Insufficiency Renal Insufficiency, Chronic Urogenital Diseases Urologic Diseases

Age range

18 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Services Institute of Medical Sciences, Lahore

Lahore, Punjab Province, 54000, Pakistan

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adult patients aged 18-70 years.
  • Both male or female.
  • End-stage kidney disease as per operational definition.
  • On a stable dialysis prescription for at least 3 months, with thrice-weekly sessions (or unit-standard schedule) and stable dry weight assessment.
  • Clinically stable over the preceding 4 weeks, with no hospitalization or acute intercurrent illness.

Exclusion criteria

  • Cardiovascular instability: recurrent intradialytic hypotension (≥30% of sessions in the prior month requiring saline or early termination), uncontrolled hypertension (SBP >180 mmHg or DBP >110 mmHg despite therapy), recent acute coronary syndrome, stroke, or decompensated heart failure within 3 months.
  • Advanced hepatic disease (decompensated cirrhosis or refractory ascites), active systemic infection, chronic inflammatory disease flare, or active malignancy under treatment likely to confound fluid status or survival.
  • Recent blood transfusion within the preceding 4 weeks, or active bleeding, as these may distort hemoglobin and inflammatory indices.
  • Advanced chronic liver disease, nephrotic-range protein loss, or other conditions likely to substantially alter serum albumin independent of dialysis modality.
  • Parathyroidectomy history or current use of intravenous calcimimetics initiation/change within the preceding 4 weeks, if expected to markedly alter intact parathyroid hormone.
  • Adherence concerns: documented inability to follow fluid/salt advice or to attend scheduled treatments during the screening period; anticipated surgery or hospitalization within the study window.

Treatment and study plan

Conventional Hemodialysis

Other

Conventional bicarbonate hemodialysis will be performed as part of routine maintenance dialysis care. This technique will primarily remove solutes through diffusion across a semipermeable dialysis membrane, with ultrafiltration for fluid removal.

Hemodiafiltration

Other

Hemodiafiltration will be performed as part of routine maintenance dialysis care. This technique will combine diffusive and convective solute removal, using replacement fluid according to departmental protocol.

Primary outcomes

  1. Mean Interdialytic Weight Gain

    Time frame: Baseline and one month after randomization.

    Mean interdialytic weight gain will be assessed in kilograms. For each dialysis session, interdialytic weight gain will be calculated as the pre-dialysis weight of the current session minus the post-dialysis weight of the immediately preceding session. Body weight will be measured using a calibrated digital scale in the dialysis unit. Session-level interdialytic weight gain values will be recorded throughout the follow-up period, and the mean value for each participant will be calculated by dividing the total interdialytic weight gain by the number of attended dialysis sessions.

Secondary outcomes

  1. Mean Hemoglobin Level

    Time frame: Baseline and one month after randomization.

    Hemoglobin level will be measured in g/dL using routine hospital laboratory testing. The mean hemoglobin level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  2. Mean C-Reactive Protein Level

    Time frame: Baseline and one month after randomization.

    C-reactive protein level will be measured in mg/L using routine hospital laboratory testing. The mean C-reactive protein level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  3. Mean Serum Albumin Level

    Time frame: Baseline and one month after randomization.

    Serum albumin level will be measured in g/dL using routine hospital laboratory testing. The mean serum albumin level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  4. Mean Total Cholesterol Level

    Time frame: Baseline and one month after randomization.

    Total cholesterol level will be measured in mg/dL using routine hospital laboratory testing. The mean total cholesterol level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  5. Mean Serum Calcium Level

    Time frame: Baseline and one month after randomization.

    Total serum calcium level will be measured in mg/dL using routine hospital laboratory testing. The mean serum calcium level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  6. Mean Serum Phosphate Level

    Time frame: Baseline and one month after randomization.

    Serum phosphate level will be measured in mg/dL using routine hospital laboratory testing. The mean serum phosphate level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

  7. Mean Intact Parathyroid Hormone Level

    Time frame: Baseline and one month after randomization.

    Intact parathyroid hormone level will be measured in pg/mL using routine hospital laboratory testing. The mean intact parathyroid hormone level will be compared between the hemodiafiltration and conventional hemodialysis groups at one month, with baseline measurement recorded for within-group change assessment.

Sponsors and collaborators

Lead sponsor

Services Institute of Medical Sciences, Pakistan

Other Gov

Registry information

Official study title

A Randomized Clinical Trial Comparing Hemodiafiltration to Conventional Hemodialysis: Effects on Clinical and Biochemical Parameters

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Jun 23, 2026
Registry last updated
Jun 23, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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