The purpose of this randomized clinical trial is to evaluate alternative technology-supported behavioral approaches to engaging 42 maintenance hemodialysis (HD) patients with persistent hyperphosphatemia in phosphorus binder adherence and dietary phosphorus restriction. Participants will be randomized to 1 of 3 intervention groups: (1) Education (Edu); (2) Edu + Self-Monitoring (SM); or (3) Edu + SM + Social Cognitive Theory (SCT)-based training program.
Investigators will evaluate the intervention in terms of feasibility and acceptability, behavior change at 12 and 24 weeks (reported phosphorus binder adherence, reported nutrient intakes, normalized protein catabolic rate), and clinical outcomes (serum phosphorus concentrations, symptoms). In addition, the impact of the different behavioral approaches on self-efficacy at 12 and 24 weeks, and the mediating effects of self-efficacy in facilitating behavioral changes and clinical outcomes will be examined.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
40
This intervention will take place during weeks 1-4 at the dialysis center. Each week, study staff will present participants with a brief educational video on: phosphorus binder adherence (week 1), meeting dietary protein needs (week 2), restricting dietary sources of phosphorus (week 3), and eliminating phosphorus-based food additives (week 4). These videos will be loaded onto tablet (Personal Computers) PCs so that participants can easily view them during regular dialysis treatment.
During the first 12 weeks of the intervention, a study dietitian will review the participants' records, and provide individualized feedback via a password-protected NYULMC email address. Feedback will be provided twice per week during weeks 1-4, once per week during weeks 5-8, and once every two weeks during weeks 9-12. The email messages will focus on both the importance of self-monitoring and the behavioral targets of the intervention. Feedback will use standardized language rather than specific dietary examples to avoid providing individualized counseling to participants (which is not the purpose of the SM intervention).
New York University School of Medicine
New York, New York, United States
Proportion of Hemodialysis (HD) patients that are eligible for the study
Measure of feasibility
Time frame: 24 Weeks
Proportion of eligible patients who agree to participate
Measure of feasibility
Time frame: 24 Weeks
Proportion of enrolled participants who complete the study
Measure of Acceptability
Time frame: 24 Weeks
8-item Morisky Medication Adherence Survey (MMAS-8)
Used to measure Binder Adherence, has been shown to be a valid and reliable measure of antihypertensive medication adherence
Time frame: 24 Weeks
Reported dietary energy, protein and phosphorus intake
participants will be directed to complete three, non-consecutive food records over the two-week period. Diet record days will include two weekdays (1 dialysis day and 1 non-dialysis day), and one non-dialysis weekend day.
Time frame: 2 Weeks
Normalized protein catabolic rate (nPCR)
The nPCR is an objective measure of protein intake in HD patients based on the accumulation of urea nitrogen in blood between dialysis treatments
Time frame: 24 Weeks
Serum phosphorus.
Pre-dialysis serum phosphorus concentrations are a key secondary clinical endpoint for this intervention. Serum phosphorus is already being measured in participants as part of the routine monthly laboratory blood work, so this information will be obtained from the participant's medical charts.
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This intervention will be delivered remotely online using the same tablet PCs provided for the SM intervention component of this treatment condition. The behavioral training program will focus on building a sense of self-efficacy with emphasis on mastery experiences that will include emphasizing past successes; setting incremental, easily achievable goals; self-monitoring to stay on track; identifying modifiable barriers to healthy behavior; positive feedback in goal achievement; and developing participant expertise in both the regimen and in problem solving around barriers to adherence.
Time frame: 24 Weeks
Frequency and severity of participant symptoms assessed via an investigator-developed questionnaire
(itching, bone and joint pain, cramping) and phosphorus binders (difficulty defecating, loose or watery stools) will be self-reported via an investigator-developed questionnaire.
Time frame: 24 Weeks
Balance Wise Self-Efficacy for Restricting Dietary Sodium in Hemodialysis Scale
be adapted to focus on adherence to phosphorus binders, dietary phosphorus restrictions and adequacy of protein intake. The self-efficacy questionnaire asks participants' to report their confidence in the next month that they will be able to complete various tasked related to the study intervention. An overall scale, and subscale scores for phosphorus binders, dietary phosphorus restriction and adequacy of protein intake will be computed by summing pertinent items for analyses.
Time frame: 24 Weeks