Arterial pH and Total Body Nitrogen Balances in APD
|ClinicalTrials.gov Identifier: NCT00586131|
Recruitment Status : Completed
First Posted : January 4, 2008
Last Update Posted : September 5, 2017
|Condition or disease||Intervention/treatment||Phase|
|End-stage Renal Disease||Drug: ammonium chloride or sodium citrate/citric acid Drug: Sodium citrate/citratic acid||Phase 4|
The normal range of pH of the blood (measure of acid-base balance of body) is rather large. It is defined as a range of pH between 7.38 and 7.44. There is evidence to suggest that a high normal arterial pH (7.43-7.45) preserves nutritional status of individuals better than a low normal arterial pH (7.36-7.38). We will test this hypothesis in a small group of stable patients with end-stage renal disease undergoing automated peritoneal dialysis. It needs to be noted that all pH levels to be attained in this study are considered to be normal. The primary outcome measure for the study will be the N-balance. The changes in blood pH will be obtained by medications (ammonium chloride for lower pH and sodium bicarbonate for higher pH).
Study Procedures: A total of eight subjects with end-stage renal disease undergoing automated peritoneal dialysis will be recruited. The initial study procedures will be for purposes of screening individuals for the study. The subjects will perform 24-hour collection of urine and dialysate to assess dialysis dose and a peritoneal equilibration test to evaluate the transport properties of the peritoneum. Only those subjects who receive the minimum dialysis dose and have an average peritoneal transport type will enter the study. During this phase, the subjects will maintain a food diary to evaluate dietary preferences and dietary calorie and protein intake. These data will be used to prepare the diets for the subjects when they are admitted to the GCRC. The next two weeks will be used to evaluate the response of arterial pH to the use of the low alkali solution. If, at the end of two weeks, the arterial pH is not in the desired range, the subjects will require ammonium chloride supplementation to achieve the lower pH. In such subjects, ammonium chloride supplementation will be used for all phases of the study.
Qualifying subjects will be hospitalized in the GCRC for 41 days. The entire period of hospitalization will be divided into two equal phases of 20.5 days each: one will be the low pH phase (low alkali dialysis solution with/without ammonium chloride) and the second will be the high pH phase (high alkali dialysis solution with sodium bicarbonate with/without ammonium chloride). Nitrogen balance will be estimated during the entire period of hospitalization. N-intake is a sum of dietary and medicinal intake, while N-output will be N-losses in dialysate, urine and feces. The N-balance will be the difference between N-intake and N-output. The second outcome measure will be leucine turnover studies. Leucine turnover studies will be performed on days 21 and 41. Leucine turnover studies provide information regarding rates of total body protein synthesis and total body protein degradation as well as rates of leucine oxidation. The study will take 10 hours each - the initial 4 hours will be after an overnight fast and the last six hours will be while being fed. The third outcome measure will be the content of some proteins in a sample of muscle biopsy. Muscle biopsy will be performed on days 21 and 41 after the completion of leucine turnover studies. Finally, nutritional assessment will be performed at the time of patient admission, on day 21 and 41. On days 21 and 41, the nutritional assessment will be performed prior to the start of the leucine turnover studies.
The subjects will be compensated for participation in this study -the amount of compensation will be dependent upon the degree of participation of subjects.
Risk-benefit Assessment: The risks of the study include the risks of performing a muscle biopsy, discomfort associated with the placement of the feeding tube, emotional problems associated with prolonged hospitalization in the GCRC and risks associated with venipuncture. There are no direct benefits to the subjects as a result of their participation in this study. However, if we demonstrate that the higher arterial pH is better at preservation of nutritional status, it may have the potential of decreasing the prevalence and/or severity of protein-energy malnutrition in patients undergoing automated peritoneal dialysis.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||8 participants|
|Intervention Model:||Crossover Assignment|
|Intervention Model Description:||Treatment with sodium citrate/citric acid or ammonium chloride chloride in each phase to achieve the desired arterial pH|
|Masking:||None (Open Label)|
|Official Title:||Effect of Arterial pH on N-balances of Patients Undergoing Automated Peritoneal Dialysis|
|Study Start Date :||September 2003|
|Primary Completion Date :||April 2008|
|Study Completion Date :||April 2008|
Active Comparator: Low normal pH (arterial pH 7.36-7.38)
Ammonium chloride or sodium citrate/citrate acid as needed to achieve the target pH
Drug: ammonium chloride or sodium citrate/citric acid
Dose dictated by changes in pH
Active Comparator: High Normal pH (arterial pH 7.44-7.46)
High Normal pH (7.44-7.46) with use of increasing doses of sodium bicarbonate up until the desired pH is achieved
Drug: Sodium citrate/citratic acid
dictated by pH
- N-balances [ Time Frame: 20 days ]Total body nitrogen balance defined as difference between nitrogen intake and nitrogen appearance in urine, stool, and dialysate
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00586131
|United States, California|
|Los Angeles Biomedical Research Institute|
|Torrance, California, United States, 90502|
|Principal Investigator:||Rajnish Mehrotra, MD||Los Angeles Biomedical Research Institute|