Chronic Renal Insufficiency
Conditions
Keywords
Chronic renal insufficiency, CKD stage 4, CKD stage 5, Protein intake, Low protein diet, Very low protein diet, Ketoanalogs, Renal death
Brief summary
The purpose of this study is to determine whether the use of a very low protein diet is effective in delaying the start of chronic dialysis treatment in patients affected by chronic kidney disease (CKD).
Detailed description
The prevalence of chronic dialysis patients is increasing worldwide because of the rising incidence of end stage renal disease, it is burdened by high cardiovascular risk, it is associated with a very high morbidity and mortality and it determines enormous costs for the community. The improvement in the management of metabolic and cardiovascular complication associated to chronic kidney disease (CKD) since the early stages of the disease becomes mandatory in order to delay the start of dialysis and to ameliorate the whole patient outcome. Dietary protein restriction represents a basic therapeutic approach in CKD, by reducing the accumulation of nitrogen catabolic substances, the phosphorus retention and the consequent hyperparathyroidism, the metabolic acidosis, the salt intake and the consequent hypertension, the proteinuria, and by improving the anemia and the glycemic tolerance, but the effects of the low protein diet on renal failure progression rate have not been definitely demonstrated. Dietary effective reduction of just 0.2 g/kg/day of proteins is effective in ameliorating blood urea nitrogen, metabolic acidosis and hyperphosphoremia, and the very low protein diet (VLPD) allows a further improving of the metabolic control of uremia, it is safe, not affecting the nutritional status, and it is cost saving. VLPD has been suggested to delay the start of renal replacement therapy with respect to standard low protein diet, by mean of either secondary analysis of clinical trials or retrospective analysis. Large randomized clinical trials (RCT) on this issue lack, and the effect of VLPD on renal death remain to be addressed. As well, information on patients' compliance to VLPD prescription and on the impact of VLPD on the quality of life are needed. Finally, also the effects of VLPD on both cardiovascular risk factors and mortality remain to be completely evaluated. The primary aim of this study is to evaluate, by mean of a RCT, the effect of the very low protein diet on the renal death in renal patients affected by chronic renal insufficiency of moderate to advanced degree (CKD stages 4 and 5). Secondary aims are to evaluate the effect of VLPD on cardiovascular risk factors, morbidity and mortality, the adherence to VLPD, and the relationship between VLPD and quality of life.
Interventions
BEHAVIORALVery low protein diet
0.3 g of proteins per kilo of body weight per day, supplemented with a mixture of essential aminoacids and chetoacids
BEHAVIORALLow protein diet
0.6 g of protein per kilo of body weight per day
Sponsors
Azienda Sanitaria ASL Avellino 2
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Patients with chronic renal insufficiency in stage CKD 4 and 5 (GFR \< 30 ml/min/1.73m2, estimated by the 24-hours creatinine clearance) receiving conservative treatment for CKD * Incident patients with chronic renal insufficiency in stage CKD 4 and 5 (GFR \< 30 ml/min/1.73m2, estimated by the 24-hours creatinine clearance), provided stable renal function determined by two 24-hour measurements of creatinine clearance 2 weeks a part
Exclusion criteria
* Patients already on very low protein diet * Change of creatinine clearance \> 30% within the last 3 months * Severe undernutrition as indicated by : 1. BMI \< 20 kg/m2 in presence of serum albumin \< 3.0 g/dl, or BMI \< 17.5 kg/m2 whatever albumin value 2. body weight reduction \> 7.5% within the last 3 months * Severe obesity as indicated by BMI \> 35 kg/m2 * Pregnancy or feeding * Chronic treatment with steroid or cytotoxic drugs * Fast progressing glomerulonephritis * Active SLE and vasculitis * Cardiac failure stage IV NYHA * Advanced liver cirrhosis * Active cancer diseases * Severe encephalopathy associated with lack of spontaneous feeding * Chronic obstructive respiratory diseases needing oxygen treatment
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Time to renal death, defined as the first event between start of renal replacement therapy or patient death | Months |
Secondary
| Measure | Time frame |
|---|---|
| Compliance to diet | Months |
| Quality of life | Months |
| Cardiovascular morbidity, defined by angina, heart failure, myocardial infarction, left ventricular mass, stroke, blood pressure, lipid profile, calcium/phosphorus/parathormone status and Charlson comorbidity index, at the start of dialysis | Months |
| Nutritional status, defined by anthropo-plicometry, biochemistry, body bioimpedance analysis (BIA), subjective global nutritional assessment (SGA), at the start and during the 1st year of dialysis | Months |
| Cardiovascular mortality | Months |
Countries
Italy
Outcome results
None listed