Cost Effectiveness of Difelikefalin Compared to Standard Care for Treating Chronic Kidney Disease Associated Pruritus (CKD-aP) in People with Kidney Failure Receiving Haemodialysis

Cost effectiveness of difelikefalin for the treatment of patients with chronic kidney disease-associated pruritus undergoing hemodialysis in Italy

BACKGROUND

Chronic kidney disease (CKD)-associated pruritus is a condition that strongly impacts CKD patients and is associated with increased morbidity/mortality, and worse health-related quality of life (HRQoL). Difelikefalin is currently the only drug approved in Europe specifically for treating moderate to severe CKD-associated pruritus in patients undergoing hemodialysis. The KALM-1 and KALM-2 trials showed better efficacy of difelikefalin vs placebo and best supportive care. The aim of this study was to investigate the cost-effectiveness of difelikefalin according to the Italian National Health Service (NHS) perspective.

METHODS

A cohort model represented by four health states (No, Mild, Moderate, and Severe pruritus) was adapted to the Italian setting. The model used data from the KALM-1 and -2 trials for efficacy, integrated with other publications for HRQoL estimations. To assess the cost of disease management, a recent Italian publication on CKD-associated pruritus was used and a price of €27 per difelikefalin vial was assumed. The base case analysis over a 15-year time horizon, and an additional 10-year scenario analysis, were established. Additionally, both deterministic univariate analysis and probabilistic multivariate sensitivity analyses were developed. Discount rates of 3% were applied. An acceptability threshold of 40,000 €/quality-adjusted life-year (QALY) was considered.

RESULTS

The results show that difelikefalin plus best supportive care is cost-effective vs best supportive care alone, with an incremental cost-effectiveness ratio, in the base case, of €35,823/QALY. Both the scenario and sensitivity analyses confirmed the strength of the results.

CONCLUSIONS

Difelikefalin was found to be a cost-effective treatment for the Italian NHS. These results support its reimbursement and its inclusion in routine clinical practice.

Risk factors affecting the sleep quality of patients on dialysis: A single-center cross-sectional study

Sleep quality is among the common complication in patients on dialysis and serious affect their health and quality of life; however, other associated risk factors are unclear. This study aimed to investigate the risk factors affecting sleep quality in patients on dialysis. Data were collected from 260 patients who met the inclusion criteria at out hospital from May 2023 to October 2023. Questionnaires were completed by patients, and biochemical indicators were obtained from past medical records. Univariate and multifactor analyses were used to find factors influencing sleep quality in patients on dialysis. Simple linear regression results showed that female, type of kidney primary disease, high systolic blood pressure (SBP), pruritus, pruritus frequency, restless legs syndrome (RLS), anxiety, and depression were associated with poor sleep quality. Blood biochemical parameters showed that low sodium and calcium levels and high ferritin levels were associated with poor sleep quality. Multiple linear regression statistics showed that female, pruritus, RLS, high SBP, depression, and high ferritin levels were associated with poor sleep quality. This study showed that female, chronic nephritis syndrome, high SBP, pruritus, RLS, low mood. and high ferritin levels were associated with poor sleep quality. Future development of individual nursing and targeted therapies is key to improving sleep quality in patients on dialysis.

Intravenous difelikefalin for the treatment of hemodialysis pruritus

INTRODUCTION

Patients with chronic kidney disease (CKD) undergoing hemodialysis often experience significant itch secondary to their condition and a subsequent reduction in their overall quality of life. Current treatments are underwhelming, necessitating the search for new, effective therapeutic options to combat itch in this population.

AREAS COVERED

The purpose of this review is to explore the available data for the use of intravenous difelikefalin in patients with CKD undergoing hemodialysis. The pathophysiology of CKD-associated itch is multifactorial, with one proposed mechanism involving an imbalance in the endogenous opioid system, favoring upregulation of itch-activating μ-opioid receptors (MORs) and downregulation of itch-inhibiting κ-opioid receptors (KORs). Dysregulation of the immune system is also involved. Difelikefalin is a recent FDA approved treatment that functions as peripherally acting KOR agonist, targeting this imbalance in the endogenous opioid system seen in CKD patients with itch and having an anti-inflammatory effect on immune cells. Clinical data on intravenous difelikefalin is promising regarding its ability to reduce itch in CKD patients on hemodialysis and improve patient quality of life, with few, mild adverse side effects.

EXPERT OPINION

As intravenous difelikefalin becomes more widely used in the clinical setting, further studies assessing long-term efficacy and safety will be needed.

Relationship Between Standardized Measures of Chronic Kidney Disease-associated Pruritus Intensity and Health-related Quality of Life Measured with the EQ-5D Questionnaire: A Mapping Study

Chronic kidney disease-associated pruritus is linked with decreased health-related quality of life assessed using disease-specific instruments. The extent to which worsening pruritus reduces generic quality of life assessed using the EQ-5D instrument is unknown. Prevalent kidney failure patients receiving in-centre haemodialysis from 5 centres completed the EQ-5D-5L quality of life measure, worst Itching Intensity Numerical Rating Scale and 5-D itch pruritus instruments. Latent class models were used to identify clusters of patients with similarly affected body parts, and mixture models were used to map the pruritus measures to the EQ-5D. Data on 487 respondents were obtained. Latent class analysis identified 3 groups of patients who had progressively worsening severity and an increasing number of body parts affected. Although the worst itching intensity numerical rating scale and 5-D itch instruments correlated with each other, only the latter had a strong relationship with EQ-5D. When controlling for age, sex, diabetes and years receiving dialysis, the meanpredicted EQ-5D utility (1: perfect health, 0: dead) decreased progressively from 0.69 to 0.41. These findings suggest that pruritus instruments that include domains capturing how the individual is physically, mentally and socially affected by their pruritus, in addition to severity, more closely approximate the EQ-5D generic quality of life measure.