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Cost-effectiveness of home telemonitoring in chronic kidney disease patients at different stages by a pragmatic randomized controlled trial (eNephro): rationale and study design



Home telemonitoring has developed considerably over recent years in chronic diseases in order to improve communication between healthcare professionals and patients and to promote early detection of deteriorating health status. In the nephrology setting, home telemonitoring has been evaluated in home dialysis patients but data are scarce concerning chronic kidney disease (CKD) patients before and after renal replacement therapy. The eNephro study is designed to assess the cost effectiveness, clinical/biological impact, and patient perception of a home telemonitoring for CKD patients. Our purpose is to present the rationale, design and organisational aspects of this study.


eNephro is a pragmatic randomised controlled trial, comparing home telemonitoring versus usual care in three populations of CKD patients: stage 3B/4 (n = 320); stage 5D CKD on dialysis (n = 260); stage 5 T CKD treated with transplantation (n= 260). Five hospitals and three not-for-profit providers managing self-care dialysis situated in three administrative regions in France are participating. The trial began in December 2015, with a scheduled 12-month inclusion period and 12 months follow-up. Outcomes include clinical and biological data (e.g. blood pressure, haemoglobin) collected from patient records, perceived health status (e.g. health related quality of life) collected from self-administered questionnaires, and health expenditure data retrieved from the French health insurance database (SNIIRAM) using a probabilistic matching procedure.


The hypothesis is that home telemonitoring enables better control of clinical and biological parameters as well as improved perceived health status. This better control should limit emergency consultations and hospitalisations leading to decreased healthcare expenditure, compensating for the financial investment due to the telemedicine system.

Trial registration

This study has been registered at under NCT02082093 (date of registration: February 14, 2014).


Chronic illness is the leading cause of disability and death worldwide [1], accounting for the majority of healthcare expenditures. Care for the chronically ill requires a multiplicity of providers, often resulting in fragmentation at multiple locations. Care coordination becomes an important issue since significant proportions of the population are affected. In the nephrology setting, Patients with chronic kidney disease (CKD) may remain asymptomatic at the early stages of the disease, leading to suboptimal care [2,3,4]. It is well documented that coordination of care between healthcare providers and multidisciplinary care teams is associated with earlier nephrology referral and reduced morbidity, mortality, overall cost and number of consultations [5]. Many countries have searched for ways to improve care coordination. Multidisciplinary care clinics have incited much interest while another possibility, telemedicine, has received relatively little attention [6]. French legislators have nevertheless recognised the potential of five telemedicine applications: teleconsultation, tele-expertise, telemonitoring, tele-assistance and coordination of medical response [7].

One promising application is home telemonitoring, a solution where active patient participation is a central component. Communication is facilitated between the patient and healthcare professionals as is interaction between healthcare providers. The characteristic feature of this mode of intervention is its capacity to strengthen patient follow-up, allowing rapid detection of early symptoms signalling potential deterioration of the patient’s health status. Theoretically, better control of chronic illness would have a significant impact on overall healthcare, limiting expenditures and reducing the need for acute care and hospitalisation. Several studies have demonstrated that telemonitoring enables better control of blood pressure, blood glucose, and asthma symptoms [8]. Telemonitoring would also improve patient autonomy by helping patients to a better understanding and control of their chronic disease and disease-related symptoms, an important incentive for treatment adherence.

Telemedicine has been evaluated in the nephrology setting for the follow-up of home dialysis patients. A clinical benefit has been demonstrated for patients on peritoneal dialysis and haemodialysis in satellite outpatient dialysis units, with a reduction in the number of hospitalisations [9,10,11]. For renal transplantation, data are scarce in the literature [12] and no telemedicine data are available for CKD stage 3-4 patients.

Very few studies have explored the cost-effectiveness of telemedicine for the management of chronic disease [13]. One study conducted in the United States among patients with chronic obstructive pulmonary disease and heart failure demonstrated a 4.3% reduction in mortality and a 9.8% reduction in cost [14]. To date no study has addressed the question for CKD patients.

The French national investments in the future programme initiated in 2010 included a tender designed to stimulate the development of economic models in the eHealth field ( Specifically, healthcare providers were encouraged to perform studies in cooperation with industrial partners to demonstrate the usefulness of large-scale programmes offering complete service packages. Designed in this framework, eNephro was selected with its industrial promoter, Pharmagest Interactive ( This background has provided a unique opportunity to evaluate the cost-effectiveness of a novel technique for home telemonitoring incorporating an expert system and centred on the active participation of CKD patients before and after renal replacement therapy.


Study objectives

The main objective of the eNephro study is to determine the cost-effectiveness of a telemedicine system compared with usual care, targeting blood pressure and proteinuria levels in stage 3B/4 CKD patients and 1-year duration of acute-care hospitalisation in dialysis and transplantation patients.

Secondary objectives focus on the cost-effectiveness of telemedicine to improve specific outcomes: clinical and biological parameters, perceived health status.

Study organisation

The eNephro study is coordinated by the Nancy University Hospital. Patients are recruited in eight centres located in three administrative regions in France: 3 University Hospitals (Nancy, Lille,Bordeaux), 2 General Hospitals (Dunkerque, Boulogne sur Mer), and 3 not-for-profit healthcare providers managing self-care dialysis (peritoneal dialysis and home haemodialysis; outpatient satellite dialysis units) namely, ALTIR Lorraine, AURAD Aquitaine, and SANTELYS DIALYSE Nord Pas-de-Calais. A steering committee composed of members delegated by the eight above-mentioned centres and the industrial promoter meets quarterly to assess study progress and make decisions regarding study logistics. A scientific committee, composed of nephrologists, epidemiologists, and a health economist, works on study design, protocol and promotion. An industrial committee including a project director, an information technology director, and a clinical trial manager is in charge of project conception and coordination, information technology development and the deployment of the eNephro plateform.

Study design and population

The eNephro study is a pragmatic randomised controlled trial (RCT) which aims to compare nephrology care delivered with a home telemonitoring system versus usual care in CKD patients at different stages of the disease. Three populations are recruited with the following inclusion criteria: age ≥ 18 years; ability to use a tablet device (alone or with assistance); population 1: stabilised stage 3B or stage 4 CKD with nephrology management of less than 3 years; population 2: stage 5D CKD treated by homecare peritoneal dialysis (PD) or out centre haemodialysis (HD); population 3: stage 5 T CKD treated by renal transplantation for 3–12 months. Non-inclusion criteria are: dialysis after renal transplantation failure; organ transplantation other than kidney; life expectancy < 1 year.

Patient census and enrolment

During the 24-month inclusion period, participating centres are invited to enrol eligible patients attending a pre-inclusion medical visit (V0) where inclusion and non-inclusion criteria are validated (Fig. 1). An inclusion visit (V1) is conducted one month later as a standard nephrology consultation with a physical examination, blood and urine tests according to guidelines of the French health authorities (HAS) [15,16,17], and therapeutic adjustment as needed.

Fig. 1
figure 1

Flow-chart of the eNephro study

At the end of the inclusion visit, eligible patients are informed about the eNephro study and asked to sign an informed consent form. Patients who agree to participate in the study are randomly assigned to a study group (intervention or control) using a random number generator integrated in the telemedicine system. Randomisation is performed by balanced blocks of 20 and stratified by -participating centre and population (1, 2, or 3). Participating patients are then referred to a clinical research nurse who collects pertinent data (see data collection below) and assists patients in filling out the study questionnaires (see outcomes of interest below). Patients assigned to the intervention group are given a commercially available 10-inch tablet device with instructions for use of the telemedicine patient interface.

Patient follow-up

The follow-up period is set at 12 months. Patients are scheduled for an intermediary visit at six months (V2) and a final end-of-study visit at 12 months (V3), conducted with the same protocol as the inclusion visit (V1). Patients in the intervention group are asked to respond to a questionnaire on the acceptability of the telemedicine system in addition to the other questionnaires (Fig. 1).

The nephrology care schedule for patients in populations 1 and 2 abides by the French recommendations [10, 15, 17], likewise for transplanted patients (population 3) in the control group. For transplanted patients in the telemonitoring group, considering the number of visits regularly scheduled during the first post-transplantation year [17], the Medical team has the possibility of cancelling every other in centre visit when clinical and biological results, transmitted by the patient are in the target and no symptom declared. Each patient’s telemedicine system transmits the following information to the data platform: body weight; body temperature; pulse rate; patient-measured systolic and diastolic blood pressure for the last three days; patient-assessed presence of symptoms including vertigo, short breath, fatigue, oedema, abdominal pain, deterioration of general health status. The telemedicine system also transmits to the data platform information issuing from medical laboratories, e.g. the biological parameters recommended by the French authorities (HAS) for the follow-up of kidney transplant recipients on samples taken three days before scheduled visits.

Description of the eNephro telemedicine system

eNephro is an eHealth information technology specifically developed for the care of CKD patients at all stages of the disease. This web-based application, harboured by secure servers according to French regulations, ensures the security, confidentiality, integrity, sustainability, availability, reversibility and tracability of collected data. As a web-based application, eNephro is accessible from any web browser.

The information system is composed of a shared electronic medical record, a secure messaging application used for communication between healthcare professionals and patients, an agenda for scheduling medical visits, and a telesurveillance application specifically designed for each population studied. In addition, eNephro harbours several expert systems, e.g. clinical decision support tools, for analysing patient data (Fig. 2).

Fig. 2
figure 2

The eNephro system

eNephro’s expert systems issued from collaboration between the Lorraine Research Laboratory in Computer Science and its Applications (LORIAFootnote 1) and nephrologists. These expert systems have been used since 2000 by end-stage renal disease (ESRD) patients on home dialysis [18,19,20,21], and 2006 by kidney transplant recipients [12]. An expert system for stage 3B/4 CKD patients was specifically developed for the purpose of this study.

eNephro’s telemonitoring system enables remote collection of clinical parameters measured by the patient and biological parameters determined by medical laboratories. The expert systems perform an automatic analysis of collected data on a daily basis. This automatic analysis filters the large data mass corresponding to normal situations not requiring any particular action and records charts to be examined at the next scheduled visit. A clinical decision support algorithm modelling medical reasoning is included in the system to detect situations of risk.

These expert systems are based on a Bayesian approach [22, 23]. An alert is generated when the analysis of the clinical and biological data indicates with high probability an alteration of the patient’s health status, before the development of clinical manifestations. The alerts generated by the expert systems are designed for early detection of the following situations: risk of dehydration/hyperhydration, poor blood pressure control, elevated proteinuria, poor anaemia control, occurrence of a complication, recognised with predefined symptoms.

Users (patients and healthcare professionals) connect via their user-dedicated interface secured with a strong authentication device: Public Key Infrastructure. Healthcare professionals use their own computer to access eNephro and patients are equipped with a tablet device.

Patient interface

Patients can access information concerning their personal situation. Patient interface functions are described in Table 1.

Table 1 eNephro patient interface

Health practitioner interface

Daily surveillance is ensured by a coordinating nurse who processes incoming data and alerts, handles aspects within his/her competency and transfers other information to the centre’s referral nephrologist. The referral nephrologist builds up patients’ medical records, manages the enrolment process, and performs intermediary and final follow-up visits. The referral nephrologist is also responsible for recording events occurring during the follow-up period, managing daily alerts transmitted by the coordinating nurse, and responding to patient messages. The patient’s general practitioner can consult the patient’s medical record at any time. Medical laboratories transfer biological results directly to the data processing platform.

Data collection

* Data recorded at inclusion and during follow-up

An electronic case report form (eCRF) is used to collect socio-demographic, clinical, biological and therapeutic data from patient records at specified time intervals in the three patient populations (Table 2).

Table 2 Data recorded at inclusion and during follow-up

Study completion is noted as are patient dropouts together with the reason (lost to follow-up, medical decision, consent withdrawal, change in disease stage, death). All data are collected and checked for completeness by nine trained clinical research nurses. An independent clinical research nurse compares 10% of the completed eCRFs for consistency with the patient’s medical record.

* Economics data

Cost values correspond to the tariffs set by the French healthcare fund. Only direct costs are taken into account for the cost analysis. Two types of cost are considered: 1) intervention-related cost (computer equipment, maintenance, personnel training for the telemedicine system), recovered from the telemedicine system supplier; 2) patient management-related costs (hospitalisation, consultation, home visits by nurses, complementary explorations, drugs and medical devices, health transport). This part of the economics data stems from the French health insurance database SNIIRAMFootnote 2 that contains individualised, anonymous and linkable data. Prospectively recorded for all beneficiaries of healthcare in France, SNIIRAM covers the entire French population (66 million inhabitants). Data recorded include all medical expenditure reimbursements for long-term disabling diseases, e.g. CKD. A probabilistic data linkage method [24] will be applied to identify patients included in the eNephro study within the anonymous SNIIRAM database.

For each population, mean cost per patient and mean cost per group (intervention vs control) are estimated, allowing to calculate an Incremental Cost Effectiveness Ratio (ICER) of telemedicine as compared with usual care. The ICER relates the overall costs to the primary endpoint for each population.

Outcomes of interest

Outcomes of interest are presented in Table 3.

Table 3 Outcomes of interest in the e-nephro study

Statistical analyses and sample size

Data processing and statistical analysis are performed by the clinical epidemiology centre of Nancy using SAS® software version 9.5 (SAS Institute, Inc., Cary, N.C.).

* Main data analyses

The statistical analysis plan includes the following procedures for each of the three study populations:

  1. (i)

    A description of the patients included in each group (intervention, control): number of patients, socio-demographic, clinical, biological and therapeutic parameters. To check the comparability of patient groups, the main features are compared using the χ 2 test for qualitative variables, analysis of variance or the Mann-Whitney test for quantitative variables.

  2. (ii)

    A description of deviations from the protocol.

  3. (iii)

    Inter-group comparison of clinical outcomes and cost-result ratios, with adjustment for any characteristic differing between two groups. Intention-to-treat analysis is applied. The percentage of patients in population 1 who reached blood pressure and proteinuria targets is compared between the intervention and control groups using a logistic regression model. For populations 2 and 3, mean durations of acute-care hospitalisation and cost-result ratios are compared between the intervention and control groups using linear regression models.

* Sample size

Sample size calculations were made to demonstrate superiority based on the estimated proportions/mean difference of the primary outcome of interest between groups (telemedicine versus usual care). The alpha risk was set at 5% and the beta risk at 10%. The total number of patients to include is 320 for population 1 (difference of 15% in the primary outcome of interest between groups), and 260 for populations 2 and 3 (mean difference: 6 days, standard deviation: 15 days for population 2 and mean difference: 8 days, standard deviation: 20 days for population 3).


There have been very few assessments of the medicoeconomic interest of home telemonitoring for chronic diseases, and the quality of evidence has often been weakened by methodological flaws. Therefore, it is difficult to compare home telemonitoring with usual care for the chronic diseases studied [25]. eNephro is the first medicoeconomic study designed to evaluate the benefits of home telemonitoring for CKD patients at different stages. The implementation of telemedicine applications differs from other health interventions, such as the use of medications or devices, in that these applications contain several interacting components and have effects that are highly dependent on the local context in which they take place. Evaluating such interventions, qualified as complex interventions [26], raises practical and methodological issues that researchers have to take into account. Guidance for developing and evaluating complex interventions was published by the Medical Research Council in 2008 [26]. Later, national and international templates for the specific evaluation of telemedicine projects, integrating general recommendations about the assessment of complex interventions, were published in 2012-13 (HAS [27], MAST [28]). All templates emphasize the need for a comparative design [29], but acknowledge the trade-off between methodological requirements to ensure internal validity and the necessity to permit a degree of flexibility or tailoring of the assessed intervention. Ensuring strict fidelity to a protocol (e.g. medications trials) may be inappropriate as the intervention may work better if adaptation to the local setting is allowed. The choice of a pragmatic trial for our evaluation combines the methodological requirements (comparative design and randomisation) and the necessary flexibility in the implementation of the intervention. Templates also underscore the usefulness of multiple outcomes and the integration of patients’ and professionals’ points of view, important aspects included in the eNephro evaluation. Moreover, the effects of telemedicine on patient health – clinical parameters, morbidity, mortality, health-related quality-of-life – are evaluated and all resources used are considered in the cost evaluation, according to the above-mentioned recommendations. The French health insurance database (SNIIRAM) appears to offer the best way to estimate medical expenditures incurred for a given patient during a given period. SNIIRAM records data for all healthcare beneficiaries in France, and includes the reimbursed costs of all out-of-hospital healthcare consumptions, as well as all hospital stays and consultations in public or private institutions [30]. Finally, the acceptability of the telemedicine system and satisfaction with its use are assessed, as recommended, for all stakeholders, i.e. patients randomised to intervention groups and health professionals involved in the home telemonitoring.

Many types of results are expected to come forward. For patients with stage 3B/4 CKD, eNephro home telemonitoring should allow enhanced follow-up since clinical and biological information will be recorded regularly by the data platform. It is also expected that the expert systems identifies early situations where patients risk for decompensation and/or deterioration of their health status, even before the development of clinical symptoms prompt them to seek medical assistance. This should enable more rapid medical intervention and a lower rate of hospitalisation. Better control of blood pressure and proteinuria should delay the need for more aggressive care with replacement therapy. For patients on home and out centre dialysis (haemodialysis or peritoneal dialysis), regular transmission of data issuing from various sources (patient, health practitioners, medical devices, medical laboratories) should lead to earlier and more rapid care for complications, with a reduction in the need for hospitalisation, an important source of medical expenditure in this population. It has been demonstrated that an expert system evaluating the state of hydration of patients on peritoneal dialysis enables a considerable reduction in the number of hospitalisations for acute pulmonary oedema [19]. Furthermore, knowing one is under telesurveillance and that important health data can be transmitted quickly is reassuring. For patients on haemodialysis, the transmission of data issuing from the generator during the dialysis session improves the detection of problems involving a malaise [31] or the vascular access [18]. Transplant recipients should also benefit from telesurveillance facilitated by a specifically designed expert system [12], and the number of visits to the transplantation centre may be limited when clinical and biological parameters remain within target ranges.

Use of a home telemonitoring system affects medical routine practices, implying to adapt and reorganise the physicians work schedule. It’s necessary to fix daily time slots for monitoring alerts, communicating with patients, or adapting treatments. As the mass of data generated by the system is significant, a telemedicine coordinator (e.g. a coordinating nurse) seems to be necessary to deal with all information transmitted. The reduction in the need for in-centre visits undoubtedly releases time for this new allotment. The acceptability of a telemedicine system by physicians depends heavily upon the capacity for optimal reorganisation, and the realisation that home telemonitoring activity is not simply an added work load. The clinical situations requiring management should be less complicated, and thus less time demanding since detected earlier by the expert system. Home telemonitoring also facilitates communication and cooperation between specialists, disciplines, and referral levels (nephrology – 2nd line referral, general medicine – 1st line referral), undoubtedly leading to improved patient-centred care. All of these elements join together to facilitate the delivery of higher quality care, a common goal for patients, professionals and healthcare systems.

For the healthcare system, home telemonitoring also contributes to cost containment by limiting the need for patient transportation, by reducing the number of in-centre visits, hospitalisations and by favouring early care for deteriorated health status and by preventing complications. In the eNephro study, it is expected that the costs generated by the telemedicine system are counterbalanced by lower overall healthcare costs. In this case, the results would be an important argument favouring reimbursement of home telemonitoring costs by the national health insurance fund.

This study can be expected to identify barriers and facilitators for implementing a home telemonitoring system as well as profiles of patients most likely to benefit from this new care system.

The first patient was enrolled in the eNephro study on November 27, 2015. At the time this article was submitted, a total of 259 patients (127 telemedicine patients; 132 control patients) had been enrolled.


  1. LORIA : Laboratoire Lorraine de Recherche en Informatique et ses Applications

  2. SNIIRAM : Système national d’information inter-régimes de l’assurance maladie



Association lorraine pour le traitement de l’insuffisance rénale


Association pour l’utilisation du rein artificiel


Chronic kidney disease


Electronic case report form


End stage renal disease


Haute autorité en santé


Haemodialysis ICER, incremental cost-effectiveness ratio


Model for assessment of telemedicine


Peritoneal dialysis


Randomised controlled trial


Système national d’information inter-régimes de l’assurance maladie.


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The authors would like to thank medical and research staff for their contribution in patient recruitment and data collection.


The e-nephro study is funded by a grant from the French Ministry of Health (National investments in the future programme, e-health tender, 2010).

Availability of data and materials

Data not yet generated.

Authors’ contributions

NT (epidemiologist) was involved in the study conception and design, drafting of the manuscript and is responsible for data analysis; JC (nephrologist) was involved in the development of the eNephro’s expert systems, performed examinations and revised the manuscript critically for important intellectual contents; LF, PC, PB, RA (nephrologists) performed examinations and revised the manuscript critically for important intellectual contents; CC, PM, CN (nephrologists) participated in the study conception, performed examinations and revised the manuscript critically for important intellectual contents; DL (study coordinator, pharmagest) was involved in the study conception and design, drafting of the manuscript and is responsible for the logistic coordination of the study; MK (nephrologist, principal investigator) was involved in the study conception and design, the development of the eNephro’s expert systems, drafting of the manuscript and is responsible for the scientific coordination of the study. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

The eNephro study has been approved by the North-Est Patient Protection Committee (n° 13.11.01), the French consultative committee for treatment of information in health research (n° 14061) and the Nation Committee of Informatics and Liberties (n° 914158). Informed consent will be obtained from all patients.

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Correspondence to Nathalie Thilly.

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Thilly, N., Chanliau, J., Frimat, L. et al. Cost-effectiveness of home telemonitoring in chronic kidney disease patients at different stages by a pragmatic randomized controlled trial (eNephro): rationale and study design. BMC Nephrol 18, 126 (2017).

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