Study of Dietary Phosphate and Mineral Homeostasis in Early Chronic Kidney Disease
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Purpose
This study is designed to describe the physiological response to increased and decreased dietary phosphate intake on various parameters of mineral metabolism in the blood and urine of individuals with Chronic Kidney Disease stage 3 and 4 with normal serum phosphate levels. This detailed study will give us a far greater understanding of the role of diet in abnormal mineral homeostasis early in the progression of this chronic disease. The findings of this study will help both physicians and dietitians better determine the optimal time to introduce dietary therapy in CKD.
| Condition | Intervention |
|---|---|
|
Kidney Diseases |
Behavioral: High/ Low Phosphate diet |
| Study Type: | Interventional |
| Study Design: | Allocation: Randomized Endpoint Classification: Efficacy Study Intervention Model: Crossover Assignment Masking: Open Label Primary Purpose: Treatment |
| Official Title: | Study of Dietary Phosphate and Mineral Homeostasis in Early Chronic Kidney Disease |
- FGF-23 [ Time Frame: 5 days ] [ Designated as safety issue: No ]
- Serum calcium, phosphate, PTH, 25 and 1,25 vitamin D and fractional phosphate excretion. [ Time Frame: 5 days ] [ Designated as safety issue: No ]
| Estimated Enrollment: | 30 |
| Study Start Date: | September 2008 |
| Estimated Study Completion Date: | December 2013 |
| Estimated Primary Completion Date: | December 2013 (Final data collection date for primary outcome measure) |
| Arms | Assigned Interventions |
|---|---|
|
Active Comparator: 1
High/ Low Phosphate diet I. A five-day low phosphate diet / A five-day low phosphate diet with the addition of a phosphate binder / A five-day high phosphate diet. II. A five-day low phosphate diet / A five-day high phosphate diet / A five-day low phosphate diet with the addition of a phosphate binder III. A five-day high phosphate diet / A five-day low phosphate diet with the addition of a phosphate binder / A five-day low phosphate diet. IV. A five-day high phosphate diet / A five-day low phosphate diet / A five-day low phosphate diet with the addition of a phosphate binder. V. A five-day low phosphate diet with the addition of a phosphate binder / A five-day low phosphate diet / A five-day high phosphate diet. VI. A five-day low phosphate diet with the addition of a phosphate binder / A five-day high phosphate diet / A five-day low phosphate diet. |
Behavioral: High/ Low Phosphate diet
Low phosphate diet (750mg/day).
|
|
Active Comparator: 2
High/ Low Phosphate diet
|
Behavioral: High/ Low Phosphate diet
Low phosphate diet (750mg/day) with the addition of the phosphate binder aluminum hydroxide (500mg three times per day).
|
|
Active Comparator: 3
High/ Low Phosphate diet
|
Behavioral: High/ Low Phosphate diet
III. High phosphate diet (2000mg /day).
|
Detailed Description:
The potential benefits of implementation of phosphate management earlier in CKD (Stages 3/4) are threefold: 1) prevention of vascular damage early in the progression of CKD thus reducing risk of cardiovascular death 2) Improved management of renal bone disease and resultant co-morbidities and 3) slowing the progression of renal failure lengthening the time required till dialysis is required. Although dietary counseling is currently a normal part of CKD care, the utility and effectiveness of lowering phosphate has not previously been quantified. In part this is due to the difficulty of measurement of serum phosphate as it is so tightly controlled before GFR falls below 30mls/min. No studies have investigated whether is it possible to modulate circulating FGF-23 and phosphate excretion in early stages of renal failure using diet in individuals with normal serum phosphate levels.
Study Objectives ;
- To measure FGF-23 levels before and after a high phosphate diet, low phosphate diet and a low phosphate diet with phosphate binders.
- To measure levels of calcium, phosphate, PTH, 25 and 1,25 vitamin D and fractional phosphate excretion before and after a high phosphate diet, low phosphate diet and a low phosphate diet with phosphate binders.
Eligibility| Ages Eligible for Study: | 19 Years and older |
| Genders Eligible for Study: | Both |
| Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- CKD patients with CKD stage 3 and 4 (eGFR < 60 ml/min and > 15 ml/min per 1.73 m2, not requiring dialysis).
- Normal serum phosphate stable over three months (> 0.87 mmol/L and < 1.70 mmol/L)
- Not yet following a low phosphate diet as reported by the patient or the renal dietitian (<1500mg/d)
- Over 19 years of age
Exclusion Criteria:
- Body mass index <20 kg/m2
- Current use of phosphate binders or active vitamin D or phenytonin (which induces vitamin D catabolism)
- Primary parathyroid defects
- Diagnosed osteoporosis
- Gut absorption defects
- Liver disease
- Pregnancy or lactation
- Patients hospitalised within the last 4 weeks
Contacts and Locations| Contact: Mhairi Sigrist, MD | 604-682-2344 ext 62979 | MSigrist@providencehealth.bc.ca |
| Canada, British Columbia | |
| St. Paul's Hospital | Recruiting |
| Vancouver, British Columbia, Canada | |
| Contact: Mhairi Sigrist, MD 604-682-2344 ext 62979 MSigrist@providencehealth.bc.ca | |
| Principal Investigator: | Adeera Levin, MD | University of British Columbia |
More Information
No publications provided
| Responsible Party: | University of British Columbia |
| ClinicalTrials.gov Identifier: | NCT00755690 History of Changes |
| Other Study ID Numbers: | H08-01018 |
| Study First Received: | September 17, 2008 |
| Last Updated: | January 16, 2013 |
| Health Authority: | Canada: Health Canada |
Keywords provided by University of British Columbia:
|
Chronic Kidney Disease CKD Diet |
Dietary Phosphate Mineral Metabolism FGF-23 |
Additional relevant MeSH terms:
|
Kidney Diseases Renal Insufficiency, Chronic Kidney Failure, Chronic Urologic Diseases Renal Insufficiency |
ClinicalTrials.gov processed this record on May 23, 2013