Nephrology · Medical Literature
Nurse-Led Digital Intervention for Sodium Restriction in Chronic Kidney Disease: Mixed Methods Implementation Study.
Abstract
Digital interventions can support sodium restriction in chronic kidney disease; yet, implementation and engagement barriers remain poorly understood. This mixed methods study evaluated a nurse-led digital program for sodium restriction, focusing on 3 key aspects: implementation, engagement, and patient experience. This study was initially designed as a randomized controlled trial but was revised to a mixed methods implementation study due to high rates of missing primary outcome data. Quantitative measures included 24-hour urinary sodium excretion (the primary outcome of the original randomized controlled trial), knowledge tests, blood pressure measurements, and quality-of-life assessments. Concurrently, we conducted in-depth qualitative interviews with a purposive sample of participants. Quantitative and qualitative data were collected in parallel, analyzed separately, and then integrated to provide a comprehensive understanding of participants' experiences with the intervention. Among 99 enrolled patients (46 in the enhanced digital intervention group and 53 in the minimal digital control group), the program led to a significant improvement in sodium-related knowledge as a secondary exploratory outcome (P=.005). However, the 24-hour urine collection completion rate was only 24.2% (n=24), precluding reliable conclusions regarding the primary outcome. Qualitative findings revealed a "measurement paradox," in which the gold-standard assessment itself posed a major barrier to adherence. Integrated data illustrated a patient journey marked by early enthusiasm, followed by declining engagement due to digital fatigue, family resistance, and poor fit with daily life. This misalignment created a disconnect between acquired knowledge and measurable behavior change. A nurse-led digital intervention was associated with modest improvements in sodium knowledge in chronic kidney disease. However, success requires reducing the monitoring burden and improving real-world fit. The "measurement paradox" highlights the need for patient-centered outcome measures. We propose a "stage-matched intervention" framework to guide adaptive digital tools. Future research should prioritize multicenter pragmatic trials to bridge the knowledge-action gap.
Clinical relevance
Dietary sodium restriction is a cornerstone of CKD management, yet scalable, sustainable delivery models remain elusive. This study addresses the critical implementation gap between digital health tools and real-world adherence in a CKD population, a group at high risk for fluid overload, hypertension, and accelerated disease progression. Clinicians should attend to these findings now as nurse-led telehealth and digital therapeutics are rapidly being integrated into nephrology practice without robust implementation evidence.
Key findings
1. Significant improvement in sodium-related knowledge was observed as a secondary exploratory outcome in the enhanced digital intervention group vs. minimal digital control (P=.005), though effect size and confidence intervals were not reported in the abstract. 2. The 24-hour urinary sodium excretion completion rate — the gold-standard primary outcome — was critically low at only 24.2% (n=24 of 99 enrolled patients), rendering the primary RCT endpoint uninterpretable and necessitating study redesign. 3. The cohort comprised 99 enrolled patients (46 in the enhanced digital intervention arm; 53 in the minimal digital control arm), reflecting modest sample size and limiting generalizability. 4. Qualitative analysis identified a 'measurement paradox' whereby the 24-hour urine collection protocol itself functioned as a primary barrier to participant adherence and engagement, rather than the intervention per se. 5. Integrated mixed-methods data revealed a characteristic patient engagement trajectory: early enthusiasm followed by progressive disengagement driven by digital fatigue, family resistance, and poor fit with daily routines. 6. A disconnect between knowledge acquisition and measurable behavioral change (the knowledge-action gap) was identified, suggesting that improved sodium literacy alone is insufficient to drive dietary adherence without corresponding reductions in monitoring burden.
Practice implications
Nephrologists and CKD care teams implementing digital sodium-restriction programs should prioritize patient-centered, low-burden outcome measures — such as spot urine sodium-to-creatinine ratios or app-based dietary logs — over 24-hour urine collections, which carry prohibitive adherence costs in outpatient populations. Nurse-led digital interventions should be designed using a 'stage-matched' adaptive framework that accounts for evolving patient motivation over time, actively addresses household-level barriers (e.g., family dietary preferences), and incorporates proactive digital fatigue mitigation strategies such as session brevity and scheduled engagement checkpoints. Future implementation should target multicenter pragmatic trial designs to generate externally valid, real-world evidence before broad clinical deployment.